Indicators

Nutrients

Total Nitrogen - Discrete

Scatter plot of monthly average total nitrogen over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only nitrogen values obtained from laboratory analyses (triangles) are included in the plot.
Scatter plot of monthly average total nitrogen over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only nitrogen values obtained from laboratory analyses (triangles) are included in the plot.
Table:

Monthly average total nitrogen decreased by less than 0.01 mg/L per year.

Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab Decreasing trend 36432 37 1989 - 2025 0.145 -0.27923 0.25822 -0.00395 0
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Total Phosphorus - Discrete

Scatter plot of monthly average total phosphorus over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only phosphorus values obtained from laboratory analyses (triangles) are included in the plot.
Scatter plot of monthly average total phosphorus over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only phosphorus values obtained from laboratory analyses (triangles) are included in the plot.
Table:

Total phosphorus showed no detectable trend between 1985 and 2025.

Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab No detectable trend 34316 40 1985 - 2025 0.006 -0.00212 0.0066 0 0.94
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Quality

Dissolved Oxygen - Continuous

Scatter plot of monthly average dissolved oxygen over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average dissolved oxygen over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Table:

There was insufficient data to fit a model for three locations.

Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
FKCB Insufficient data 46023 2 2024 - 2025 6.5 - - - -
FKLK Insufficient data 51715 2 2024 - 2025 6.2 - - - -
FKTCB Insufficient data 13514 2 2021 - 2022 6.4 - - - -
Map showing location of dissolved oxygen continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of dissolved oxygen continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Dissolved Oxygen - Discrete

Scatter plot of monthly average dissolved oxygen over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only dissolved oxygen values measured in the field (circles) are included in the plot.
Scatter plot of monthly average dissolved oxygen over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only dissolved oxygen values measured in the field (circles) are included in the plot.
Table:

Dissolved oxygen showed no detectable trend between 1989 and 2025.

Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Field No detectable trend 54598 37 1989 - 2025 6.3 -0.01464 6.3276 -0.00108 0.6653
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Dissolved Oxygen Saturation - Continuous

Scatter plot of monthly average dissolved oxygen saturation over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average dissolved oxygen saturation over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Table:

There was insufficient data to fit a model for three locations.

Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
FKCB Insufficient data 46055 2 2024 - 2025 100.5 - - - -
FKLK Insufficient data 51731 2 2024 - 2025 93.6 - - - -
FKTCB Insufficient data 17063 2 2021 - 2022 100.2 - - - -
Map showing location of dissolved oxygen saturation continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of dissolved oxygen saturation continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Dissolved Oxygen Saturation - Discrete

Scatter plot of monthly average dissolved oxygen saturation over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only dissolved oxygen saturation values measured in the field (circles) are included in the plot.
Scatter plot of monthly average dissolved oxygen saturation over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only dissolved oxygen saturation values measured in the field (circles) are included in the plot.
Table:

Monthly average dissolved oxygen saturation increased by 0.17% per year.

Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Field Increasing trend 30582 31 1995 - 2025 94.73586 0.17712 92.04785 0.17005 0
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Salinity - Discrete

Scatter plot of monthly average salinity over time. If the time series included ten or more years of discrete observations, significant (blue) or non-significant (magenta) trend lines are also shown. Discrete salinity values derived from grab samples analyzed in the field (circles) or the laboratory (triangles) are both included in the plot.
Scatter plot of monthly average salinity over time. If the time series included ten or more years of discrete observations, significant (blue) or non-significant (magenta) trend lines are also shown. Discrete salinity values derived from grab samples analyzed in the field (circles) or the laboratory (triangles) are both included in the plot.
Table:

Monthly average salinity increased by 0.05 ppt per year.

Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
All Increasing trend 62689 48 1955 - 2025 36.0929 0.13255 33.11127 0.04512 0.0001
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Salinity - Continuous

Scatter plot of monthly average salinity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average salinity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Table:

No detectable change in monthly average salinity was observed at one location. There was insufficient data to fit a model for five locations.

Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
1B No detectable trend 86204 6 2003 - 2008 36.07 0.24 35.68 0.17 0.05
245323080410100 Insufficient data 746 3 2002 - 2004 35.00 - - - -
245622080364200 Insufficient data 764 3 2002 - 2004 35.00 - - - -
FKCB Insufficient data 48788 2 2024 - 2025 36.50 - - - -
FKLK Insufficient data 54579 2 2024 - 2025 36.50 - - - -
FKTCB Insufficient data 13641 2 2021 - 2022 37.90 - - - -
Map showing location of salinity continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of salinity continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Temperature - Continuous

Atlantic Oceanographic and Meteorological Laboratory (AOML) South Florida Program Moored Instrument Array - 2

Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Table:

At eighty-two program locations, monthly average water temperature increased between 0.01 and 0.16°C per year. No detectable change in monthly average water temperature was observed at forty-one locations. There was insufficient data to fit a model for ten locations.

Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
1B Increasing trend 86204 6 2003 - 2008 26.38 0.26 25.73 0.16 0.04
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

National Data Buoy Center - 5

Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Table:

At eighty-two program locations, monthly average water temperature increased between 0.01 and 0.16°C per year. No detectable change in monthly average water temperature was observed at forty-one locations. There was insufficient data to fit a model for ten locations.

Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
KYWF1 Increasing trend 1581280 22 2005 - 2026 27.5 0.28 26.67 0.06 0.00
LONF1 No detectable trend 205971 28 1992 - 2019 26.6 0.07 26.34 0.01 0.08
MLRF1 Increasing trend 256798 33 1987 - 2019 26.5 0.10 26.49 0.01 0.00
SANF1 No detectable trend 117833 15 1991 - 2005 26.7 -0.03 26.69 0.00 0.62
SMKF1 Increasing trend 154326 21 1988 - 2008 26.8 0.34 26.24 0.06 0.00
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

National Water Information System - 7

Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Table:

At eighty-two program locations, monthly average water temperature increased between 0.01 and 0.16°C per year. No detectable change in monthly average water temperature was observed at forty-one locations. There was insufficient data to fit a model for ten locations.

Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
245323080410100 Insufficient data 791 3 2002 - 2004 27.9 - - - -
245622080364200 Insufficient data 853 3 2002 - 2004 28.3 - - - -
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Florida Keys National Marine Sanctuary Seagrass Monitoring Project - 296

Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Table:

At eighty-two program locations, monthly average water temperature increased between 0.01 and 0.16°C per year. No detectable change in monthly average water temperature was observed at forty-one locations. There was insufficient data to fit a model for ten locations.

Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
214 Increasing trend 136333 18 2002 - 2019 26.52 0.27 25.84 0.07 0
215 Increasing trend 133286 16 2003 - 2018 26.74 0.26 26.42 0.05 0
216 Increasing trend 98535 17 2002 - 2018 26.26 0.31 25.86 0.06 0
220 Increasing trend 126033 17 2003 - 2019 26.52 0.25 25.94 0.06 0
223 Increasing trend 133082 18 2002 - 2019 26.89 0.3 25.84 0.08 0
225 Increasing trend 117692 17 2002 - 2019 26.82 0.32 26.32 0.06 0
227 Increasing trend 105351 17 2003 - 2019 26.67 0.29 26.06 0.08 0
235 Increasing trend 128499 18 2002 - 2019 27.14 0.28 25.77 0.08 0
237 Increasing trend 122250 18 2002 - 2019 26.38 0.31 25.74 0.09 0
239 Increasing trend 111523 17 2002 - 2018 26.92 0.24 25.96 0.07 0
241 Increasing trend 127914 18 2002 - 2019 27.26 0.27 25.91 0.09 0
243 Increasing trend 121593 18 2002 - 2019 26.62 0.3 26 0.07 0
248 Increasing trend 111702 18 2002 - 2019 26.79 0.31 25.54 0.08 0
255 Increasing trend 119939 18 2002 - 2019 26.35 0.24 25.73 0.07 0
260 Increasing trend 97832 16 2002 - 2019 27.07 0.28 26.22 0.08 0
267 Increasing trend 99735 18 2002 - 2019 26.57 0.24 25.64 0.05 0
269 Increasing trend 106458 17 2002 - 2019 26.74 0.21 26.02 0.05 0
271 Increasing trend 133627 18 2002 - 2019 26.92 0.26 25.77 0.07 0
273 Increasing trend 129817 18 2002 - 2019 27.16 0.24 26.16 0.05 0
276 Increasing trend 123833 18 2002 - 2019 26.87 0.21 26.15 0.05 0
284 Increasing trend 123977 17 2002 - 2019 26.86 0.28 25.14 0.09 0
285 Increasing trend 121423 18 2002 - 2019 26.86 0.25 26.17 0.07 0
287 Increasing trend 133008 18 2002 - 2019 26.87 0.29 25.84 0.08 0
291 Increasing trend 116240 18 2002 - 2019 26.38 0.26 25.72 0.09 0
294 Increasing trend 112348 18 2002 - 2019 26.92 0.27 25.52 0.09 0
296 Increasing trend 114497 17 2002 - 2019 27.36 0.21 25.45 0.07 0
305 Increasing trend 122296 18 2002 - 2019 26.43 0.22 26.07 0.06 0
307 Increasing trend 110802 17 2002 - 2019 26.74 0.22 25.73 0.07 0
309 Increasing trend 107410 18 2002 - 2019 27.85 0.27 26.07 0.06 0
314 Increasing trend 110686 18 2002 - 2019 27.41 0.23 25.63 0.06 0
500 Increasing trend 69048 8 2012 - 2019 27.33 0.23 26.79 0.12 0.01
501 No detectable trend 34805 5 2012 - 2018 27.48 0.11 27.55 0.05 0.65
502 Insufficient data 22765 4 2016 - 2019 26.70 - - - -
503 Insufficient data 7490 1 2016 - 2016 28.74 - - - -
504 Insufficient data 4339 1 2018 - 2018 29.84 - - - -
506 No detectable trend 35198 7 2012 - 2019 27.41 0.04 27.2 0.05 0.74
507 No detectable trend 47517 8 2012 - 2019 27.36 0.18 27.48 0.09 0.12
508 No detectable trend 24021 6 2012 - 2019 26.67 0.33 26.54 0.07 0.29
509 No detectable trend 38607 8 2012 - 2019 27.70 0.05 27.79 0.11 0.47
SB Increasing trend 145514 19 2001 - 2019 26.34 0.23 25.9 0.06 0
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

USGS Coral Reef Ecosystem Studies (CREST) Project - 899

Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Table:

At eighty-two program locations, monthly average water temperature increased between 0.01 and 0.16°C per year. No detectable change in monthly average water temperature was observed at forty-one locations. There was insufficient data to fit a model for ten locations.

Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Crocker Increasing trend 322670 10 2013 - 2022 27.32 0.15 27.07 0.03 0.04
Molasses No detectable trend 140713 5 2009 - 2013 26.72 -0.03 26.61 -0.04 0.92
Sombrero Increasing trend 459354 14 2009 - 2022 27.16 0.26 26.83 0.05 0.00
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Temperature on Coral Reefs in the Florida Keys - 986

Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Table:

At eighty-two program locations, monthly average water temperature increased between 0.01 and 0.16°C per year. No detectable change in monthly average water temperature was observed at forty-one locations. There was insufficient data to fit a model for ten locations.

Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
10 No detectable trend 32760 5 2020 - 2024 27.48 0.23 26.68 0.20 0.18
11 Increasing trend 243135 20 2003 - 2024 26.84 0.34 26.13 0.07 0.00
12 Increasing trend 152036 15 2008 - 2024 27.18 0.26 26.41 0.07 0.00
14 Increasing trend 238807 21 2002 - 2024 26.96 0.31 26.29 0.06 0.00
15 Increasing trend 218855 19 2006 - 2024 27.04 0.23 26.45 0.06 0.00
18 Increasing trend 59983 9 2016 - 2024 27.18 0.20 26.21 0.08 0.03
21 Increasing trend 69835 9 2016 - 2024 27.23 0.20 26.46 0.08 0.03
22 Increasing trend 185473 16 2009 - 2024 26.96 0.28 26.35 0.07 0.00
23 Increasing trend 128184 13 2012 - 2024 27.43 0.27 26.73 0.08 0.00
24 Increasing trend 126389 13 2010 - 2024 27.08 0.40 26.16 0.10 0.00
25 Increasing trend 132181 14 2010 - 2024 27.28 0.21 26.73 0.07 0.00
26 Increasing trend 156891 16 2009 - 2024 27.08 0.31 26.74 0.08 0.00
30 Increasing trend 131074 13 2012 - 2024 26.67 0.26 26.23 0.06 0.00
32 Increasing trend 237317 20 2003 - 2024 26.74 0.36 26.04 0.07 0.00
33 No detectable trend 50595 8 2016 - 2024 27.06 0.17 26.04 0.09 0.18
34 Increasing trend 289051 23 2002 - 2024 26.84 0.36 25.94 0.07 0.00
35 Increasing trend 232782 19 2006 - 2024 26.98 0.28 26.19 0.06 0.00
36 Increasing trend 207795 18 2007 - 2024 27.01 0.32 26.43 0.07 0.00
37 Increasing trend 67333 9 2016 - 2024 27.03 0.30 26.27 0.12 0.00
38 Increasing trend 271179 23 2002 - 2024 26.59 0.35 25.96 0.07 0.00
39 No detectable trend 48939 7 2018 - 2024 27.06 0.09 27.06 0.08 0.45
40 Increasing trend 259048 23 2002 - 2024 26.89 0.33 26.28 0.07 0.00
50 Increasing trend 118231 12 2013 - 2024 27.11 0.33 26.82 0.07 0.00
51 Increasing trend 237296 20 2003 - 2024 26.74 0.37 26.11 0.06 0.00
52 Increasing trend 202154 17 2008 - 2024 27.01 0.40 26.61 0.08 0.00
53 Increasing trend 193391 17 2008 - 2024 27.06 0.42 26.53 0.08 0.00
54 Increasing trend 142926 13 2012 - 2024 27.09 0.31 26.64 0.06 0.00
55 Increasing trend 231874 23 2002 - 2024 26.94 0.33 26.69 0.06 0.00
56 Increasing trend 190431 19 2006 - 2024 26.81 0.28 26.69 0.05 0.00
57 Increasing trend 202888 17 2008 - 2024 27.08 0.38 26.61 0.08 0.00
58 Increasing trend 87137 11 2014 - 2024 27.35 0.25 26.94 0.07 0.00
59 Increasing trend 206603 20 2002 - 2024 26.96 0.37 26.63 0.07 0.00
60 Increasing trend 156278 16 2009 - 2024 27.01 0.23 26.99 0.05 0.00
61 Increasing trend 68996 9 2016 - 2024 27.35 0.39 26.46 0.11 0.00
70 Increasing trend 119048 12 2013 - 2024 27.01 0.33 26.73 0.06 0.00
72 Increasing trend 198393 16 2008 - 2023 26.86 0.47 26.39 0.08 0.00
73 Increasing trend 193376 17 2008 - 2024 26.81 0.40 26.47 0.08 0.00
74 Increasing trend 142860 13 2012 - 2024 26.94 0.31 26.52 0.06 0.00
75 Increasing trend 159540 15 2010 - 2024 27.23 0.39 26.49 0.08 0.00
76 Increasing trend 183695 16 2009 - 2024 26.98 0.35 26.63 0.07 0.00
77 Increasing trend 203309 17 2008 - 2024 27.01 0.36 26.51 0.07 0.00
78 Increasing trend 102736 11 2014 - 2024 27.16 0.27 26.66 0.08 0.00
79 Increasing trend 190275 18 2007 - 2024 26.94 0.33 26.51 0.07 0.00
80 Increasing trend 182341 16 2009 - 2024 27.03 0.33 26.77 0.07 0.00
81 Increasing trend 68931 9 2016 - 2024 27.35 0.39 26.48 0.11 0.00
83 Increasing trend 139311 17 2006 - 2023 25.86 0.19 25.79 0.05 0.00
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Continuous Bottom Temperature Measurements along the Florida Reef Tract - 989

Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Table:

At eighty-two program locations, monthly average water temperature increased between 0.01 and 0.16°C per year. No detectable change in monthly average water temperature was observed at forty-one locations. There was insufficient data to fit a model for ten locations.

Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
FKNMS-200YR-HD No detectable trend 44601 12 1998 - 2009 26.10 -0.1 26.45 -0.04 0.17
FKNMS-7MILE-BR No detectable trend 73055 19 1991 - 2010 26.66 0.05 26.22 0.01 0.35
FKNMS-9FT-SHOAL No detectable trend 80299 21 1990 - 2010 26.50 0 26.76 0 0.99
FKNMS-ALLIGATOR No detectable trend 65144 19 1990 - 2010 26.55 -0.06 26.72 -0.01 0.23
FKNMS-BHONDA-BR No detectable trend 77111 22 1990 - 2011 26.60 -0.02 26.67 0 0.66
FKNMS-BOCA-GRND No detectable trend 73434 17 1990 - 2012 26.14 0.08 26.04 0.01 0.17
FKNMS-BULLARD Increasing trend 66230 18 1992 - 2009 26.31 0.12 26.11 0.02 0.03
FKNMS-CARD-SND No detectable trend 18249 6 2001 - 2006 26.52 -0.05 27.32 -0.05 0.79
FKNMS-CARYSFORT No detectable trend 55001 16 1990 - 2006 26.40 -0.03 26.38 0 0.64
FKNMS-DIEGO-TER No detectable trend 16693 5 2002 - 2006 25.58 -0.05 25.91 -0.03 0.84
FKNMS-ELPIS No detectable trend 31035 8 2004 - 2011 26.35 0.06 25.9 0.04 0.53
FKNMS-GRECIAN No detectable trend 51723 18 1990 - 2010 26.65 -0.03 26.48 0 0.66
FKNMS-HARBORKEY No detectable trend 15407 5 1992 - 1997 26.50 0.14 25.74 0.14 0.33
FKNMS-HEN-and-CHIX No detectable trend 72285 21 1989 - 2011 26.50 -0.01 26.35 0 0.88
FKNMS-KW-CHANL No detectable trend 123578 18 1991 - 2012 26.27 0.1 26.11 0.02 0.08
FKNMS-LONG-KEY No detectable trend 69656 19 1990 - 2010 26.64 -0.03 26.35 -0.01 0.58
FKNMS-LOOE-BACK No detectable trend 84984 18 1990 - 2012 26.80 -0.06 26.6 -0.01 0.42
FKNMS-LOOE-BUOY5 No detectable trend 35252 10 1988 - 1998 26.90 0.05 26.86 0.02 0.36
FKNMS-LOOE-ISELIN No detectable trend 194367 13 1999 - 2014 26.88 0.13 26.55 0.03 0.08
FKNMS-MAITLAND Insufficient data 12421 4 2004 - 2007 26.07 - - - -
FKNMS-MOLASSES No detectable trend 36146 13 1990 - 2002 26.70 -0.05 26.74 -0.01 0.48
FKNMS-NEWGROUND No detectable trend 35329 12 1992 - 2006 25.49 -0.05 25.73 -0.01 0.52
FKNMS-PILLAR No detectable trend 40805 11 1996 - 2006 26.24 0.02 26.04 0.01 0.94
FKNMS-SAND-KEY No detectable trend 59287 18 1990 - 2010 26.70 0.05 26.46 0.01 0.32
FKNMS-SMITH-SHL No detectable trend 94527 10 1998 - 2012 25.45 0.13 25.99 0.02 0.19
FKNMS-SNAKE-CRK No detectable trend 56777 19 1989 - 2007 26.16 -0.06 26.33 -0.02 0.28
FKNMS-SOMBRERO No detectable trend 48974 13 1991 - 2005 26.50 0.13 26.14 0.03 0.05
FKNMS-SPRIGGER No detectable trend 41834 13 1992 - 2006 26.10 0.02 25.78 0 0.86
FKNMS-TENN-REEF No detectable trend 63260 16 1990 - 2006 26.70 -0.06 26.22 -0.01 0.27
FKNMS-WELLWOOD No detectable trend 30427 8 2002 - 2009 26.43 0 26.82 0 1
FKNMS-WS-BUOY16 Insufficient data 8123 3 2003 - 2005 25.99 - - - -
FKNMS-WS-JACKYL No detectable trend 29557 9 1991 - 1999 26.40 0.17 26.96 0.06 0.09
FKNMS-W-SAMBO No detectable trend 18786 6 1990 - 1995 26.90 0.09 26.16 0.03 0.56
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Florida Keys Aquatic Preserves Continuous Water Quality Monitoring - 10004

Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Table:

At eighty-two program locations, monthly average water temperature increased between 0.01 and 0.16°C per year. No detectable change in monthly average water temperature was observed at forty-one locations. There was insufficient data to fit a model for ten locations.

Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
FKCB Insufficient data 48829 2 2024 - 2025 27.4 - - - -
FKLK Insufficient data 54509 2 2024 - 2025 28.2 - - - -
FKTCB Insufficient data 30145 2 2021 - 2022 26.7 - - - -
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Temperature - Discrete

Scatter plot of monthly average water temperature over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only water temperature measurements taken in the field (circles) are included in the plot.
Scatter plot of monthly average water temperature over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only water temperature measurements taken in the field (circles) are included in the plot.
Table:

Monthly average water temperature increased by 0.03°C per year.

Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Field Increasing trend 63153 47 1955 - 2025 27.2272 0.26928 24.30906 0.03178 0
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

pH - Continuous

Scatter plot of monthly average pH over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average pH over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Table:

There was insufficient data to fit a model for three locations.

Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
FKCB Insufficient data 48063 2 2024 - 2025 8.1 - - - -
FKLK Insufficient data 54596 2 2024 - 2025 8.1 - - - -
FKTCB Insufficient data 22914 2 2021 - 2022 8.1 - - - -
Map showing location of ph continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of ph continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

pH - Discrete

Scatter plot of monthly average pH over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only pH values measured in the field (circles) are included in the plot.
Scatter plot of monthly average pH over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only pH values measured in the field (circles) are included in the plot.
Table:

Monthly average pH decreased by less than 0.01 pH units per year.

Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Field Decreasing trend 16755 32 1994 - 2025 8.081 -0.20832 8.1092 -0.00402 0
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Specific Conductivity - Continuous

Scatter plot of monthly average specific conductivity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average specific conductivity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Table:

No detectable change in monthly average specific conductivity was observed at one location. There was insufficient data to fit a model for three locations.

Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
1B No detectable trend 86204 6 2003 - 2008 56.33 0.21 55 0.45 0.1
FKCB Insufficient data 48788 2 2024 - 2025 55.09 - - - -
FKLK Insufficient data 54579 2 2024 - 2025 55.16 - - - -
FKTCB Insufficient data 13641 2 2021 - 2022 57.01 - - - -
Map showing location of specific conductivity continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of specific conductivity continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Clarity

Turbidity - Continuous

Scatter plot of monthly average turbidity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average turbidity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Table:

There was insufficient data to fit a model for three locations.

Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
FKCB Insufficient data 37724 2 2024 - 2025 4 - - - -
FKLK Insufficient data 41048 2 2024 - 2025 5 - - - -
FKTCB Insufficient data 19289 2 2021 - 2022 3 - - - -
Map showing location of turbidity continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of turbidity continuous water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Turbidity - Discrete

Scatter plot of monthly average turbidity over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only turbidity values measured in the laboratory (triangles) are included in the plot.
Scatter plot of monthly average turbidity over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only turbidity values measured in the laboratory (triangles) are included in the plot.
Table:

Turbidity showed no detectable trend between 1991 and 2025.

Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab No detectable trend 3974 35 1991 - 2025 0.7 -0.04939 0.87625 -0.00328 0.1706
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Total Suspended Solids - Discrete

Scatter plot of monthly average total suspended solids (TSS) over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only TSS values obtained from laboratory analyses (triangles) are included in the plot.
Scatter plot of monthly average total suspended solids (TSS) over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only TSS values obtained from laboratory analyses (triangles) are included in the plot.
Table:

Monthly average total suspended solids decreased by 4.39 mg/L per year, indicating an increase in water clarity.

Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab Decreasing trend 560 19 2007 - 2025 13 -0.58264 45.47597 -4.38958 0
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Chlorophyll a, Uncorrected for Pheophytin - Discrete

Scatter plot of monthly average levels of chlorophyll a, uncorrected for pheophytin, over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed chlorophyll a (triangles) is included in the plot.
Scatter plot of monthly average levels of chlorophyll a, uncorrected for pheophytin, over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed chlorophyll a (triangles) is included in the plot.
Table:

Chlorophyll a, uncorrected for pheophytin, showed no detectable trend between 1989 and 2025.

Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab No detectable trend 22200 37 1989 - 2025 0.29358 0.00726 0.43012 0.00026 0.858
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Chlorophyll a, Corrected for Pheophytin - Discrete

Scatter plot of monthly average levels of chlorophyll a, corrected for pheophytin, over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed chlorophyll a (triangles) is included in the plot.
Scatter plot of monthly average levels of chlorophyll a, corrected for pheophytin, over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed chlorophyll a (triangles) is included in the plot.
Table:

Monthly average chlorophyll a, corrected for pheophytin, increased by 0.03 µg/L per year, indicating a decrease in water clarity.

Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab Increasing trend 2230 18 2004 - 2025 0.68 0.18656 0.38484 0.02539 0.0012
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Secchi Depth - Discrete

Scatter plot of monthly average Secchi depth over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Secchi depth is only measured in the field (circles).
Scatter plot of monthly average Secchi depth over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Secchi depth is only measured in the field (circles).
Table:

Secchi depth showed no detectable trend between 1996 and 2025.

Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Field No detectable trend 5182 30 1996 - 2025 -2.13363 0.0459 -2.49352 0.00512 0.2638
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.

Colored Dissolved Organic Matter - Discrete

Scatter plot of monthly average colored dissolved organic matter (CDOM) over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed CDOM (triangles) is included in the plot.
Scatter plot of monthly average colored dissolved organic matter (CDOM) over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed CDOM (triangles) is included in the plot.
Table:

Monthly average colored dissolved organic matter increased by 0.09 PCU per year, indicating a decrease in water clarity.

Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab Increasing trend 1041 25 2001 - 2025 6 0.22711 5.5569 0.09091 0.0009
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Florida Keys National Marine Sanctuary. The bubble size on the maps above reflect the amount of data available at each sampling site.