Water Quality Contour Mapping

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Water Quality Changes Over Space and Time

In an open body of water such as a bay, water quality may vary considerably in its different regions, and its water quality will also change continually from month to month, season to season, year to year. Tidal influence, land use in the watershed, inflow from tributaries, seasonal temperature changes, and rainfall are the most important factors driving these differences. A Water Quality Contour Map (WQCM) shows the spatial distribution of water quality for a defined period in time. By creating contour maps for multiple different periods, it is possible to detect both spatial and temporal patterns in water quality, and to see trends over time. Learn more »

Click on a parameter name and select a year from the list of report years available to discover spatial and temporal variations in water quality. Clicking on a PDF thumbnail will open the full report for viewing and download. Alternatively, click the "View Image Slideshow" button to view an interactive slideshow of the generated raster images.

Available Parameters (Select One)

Contour Maps

Select a report to open and view/download the corresponding PDF file. Alternatively, you can open an image slideshow of the contour rasters used in these reports.

Agency Summary

Data collected by the following agencies were used in preparation of these reports.

Agency Period of Record
(Month, Year)		 Station Count
(Approximate)		 Sample Count
(Approximate)
Cape Coral Canal Watch May 1995 — March 2025 28,330 28,400
Shellfish Environmental Assessment Data February 1979 — June 2003 5,260 13,700
EPC Monthly Routine Water Monitoring May 1981 — February 2020 3,160 11,300
FLORIDA DEPARTMENT OF HEALTH IN SARASOTA COUNTY BEACH RESULTS November 2017 — January 2021 360 2,700
EPC Water Quality Data May 1981 — May 2006 1,620 4,900
Water quality data collected by the City of Lakeland August 1966 — June 2021 16,610 99,200
LAKEWATCH Volunteer Water Quality Monitoring June 1989 — January 2019 31,170 118,800
LCHCD River Sampling January 2016 — December 2024 2,890 2,900
Lee County Pondwatch January 2000 — December 2023 21,070 21,100
Lower watershed program (LWP) January 2000 — September 2019 5,480 14,000
Polk County Parks & Natural Resources Division July 1984 — July 2021 77,740 184,700
Briarwood Stormwater Treatment Facility July 2020 — April 2024 540 500
Sarasota County Coastal Creeks February 1998 — March 2025 79,980 151,100
Sarasota County Environmental Services Department Sampling Data March 2004 — December 2006 360 205,200
Sarasota County Environmental Services Department Sampling Data February 1998 — May 2025 50,780 96,300
SWFWMD Hydrologic Data Section Data October 2015 — July 2025 240 4,100
SWFWMD Water Quality Monitoring Program Data January 2000 — April 2005 1,930 3,600
USGS National Water Information System October 1939 — July 2025 20,620 120,800
Collier County Coastal Zone Management Department July 2017 — December 2024 2,460 2,800
FDEP Central Regional Operations Center February 2014 — April 2025 1,100 2,400
FDEP Charlotte Harbor Aquatic/Buffer Preserves Sampling Data November 1996 — May 2025 43,050 47,800
Charlotte County June 2022 — May 2024 12,240 13,800
City of Bonita Springs August 2009 — March 2025 3,730 3,700
City of Fort Myers January 2017 — March 2025 6,470 6,500
Collier County Pollution Control July 2017 — September 2024 6,400 7,100
Florida Healthy Beaches Program and Data (Bacterial Counts) July 2000 — March 2025 12,750 87,200
Lee County Environmental Laboratories June 1989 — March 2025 274,900 280,700
Flatwoods Consulting Group February 2018 — October 2023 150 200
FDEP South District Sampling Data February 1999 — May 2025 33,530 43,200
FDEP Watershed Monitoring Section October 1998 — January 2025 14,780 21,600
Environmental Protection Commission of Hillsborough County July 2017 — April 2025 940 2,700
Florida LAKEWATCH September 2018 — February 2025 24,740 28,900
Lehigh Acres Municipal Services Improvement District April 2017 — December 2024 6,380 6,500
Manatee County Environmental Management Sampling Data December 1995 — March 2025 4,560 11,000
Mosaic Fertilizer, LLC April 2012 — December 2024 6,070 6,400
City of North Port September 2004 — December 2024 6,890 9,200
Polk County Natural Resources Division July 1984 — May 2025 70,130 81,800
City of Sanibel, Natural Resources Department February 2002 — March 2025 6,160 6,200
Sanibel-Captiva Conservation Foundation January 2012 — May 2025 21,720 26,700
South Florida Water Management District January 2015 — April 2025 38,260 57,600
Enviro-Audit January 2022 — April 2025 100 100
SWFWMD Water Quality Sampling Data August 1997 — December 2024 80,860 156,700
FDEP Southwest Regional Operations Center January 1998 — May 2025 7,810 16,800
Village of Estero August 2020 — March 2025 1,870 1,900
FDEP Southeast Regional Operations Center April 2019 — June 2025 750 1,200
FDEP Watershed Assessment Section April 2013 — June 2024 700 800
FDEP, Water Quality Standards and Special Projects (Florida) March 2005 — November 2005 30 100
City of Cape Coral March 1986 — December 2024 81,750 153,000
Coastal Charlotte Harbor Monitoring Network (CCHMN) - Matlacha Pass March 2002 — December 2024 7,060 9,200
Peace River Manasota Regional Water Supply Authority (FL) August 1996 — December 2024 18,780 127,300
City of Lakeland September 2014 — March 2025 1,570 3,700