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
FLORIDA DEPARTMENT OF HEALTH IN SARASOTA COUNTY BEACH RESULTS November 2017 — January 2021 360 2,700
LCHCD River Sampling January 2016 — December 2024 2,890 2,900
Lee County Pondwatch January 2000 — December 2023 21,070 21,100
Sarasota County Coastal Creeks February 1998 — December 2025 88,010 158,300
Sarasota County Environmental Services Department Sampling Data February 1998 — December 2025 63,670 109,600
SWFWMD Hydrologic Data Section Data October 2015 — May 2026 260 5,000
USGS National Water Information System October 1939 — February 2026 20,910 133,000
FDEP Charlotte Harbor Aquatic/Buffer Preserves Sampling Data November 1996 — December 2025 43,700 48,500
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
Florida Healthy Beaches Program and Data (Bacterial Counts) July 2000 — December 2025 12,850 87,600
Lee County Environmental Laboratories June 1989 — March 2025 274,900 280,700
FDEP South District Sampling Data February 1999 — November 2025 33,780 43,500
City of North Port September 2004 — December 2024 6,890 9,200
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
Suncoast Waterkeeper January 2023 — January 2026 130 300
South Florida Water Management District January 2015 — April 2025 38,260 57,600
SWFWMD Water Quality Sampling Data August 1997 — December 2025 81,610 157,500
FDEP Southwest Regional Operations Center January 1998 — December 2025 8,020 17,100
Village of Estero August 2020 — March 2025 1,870 1,900
FDEP Watershed Assessment Section April 2013 — June 2024 700 800
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