Water Quality Trends

Explore short- and long-term trends for those water quality parameters that are most useful in evaluating the extent of nutrient pollution.

Data is presented and analyzed here in two ways:

  1. Stratum: 60 randomized samples are collected each month to capture representative water quality conditions across 10 waterbodies throughout the CHNEP area over multiple years, these waterbodies are the 'stratum'. This data is collected by partners in the Coastal Charlotte Harbor Monitoring Network (CCHMN).
  2. Fixed Station: individual stations where samples have been collected in the same location over multiple years and are representative of water quality conditions at that station. CHNEP's county and municipal partners and established volunteer programs listed below collect this data.

The Coastal Charlotte Harbor Monitoring Network (CCHMN) is a regional partnership of agencies (managed under the CHNEP) initiated in 2001 that collects monthly water quality data using a consistent, technically sound sampling design. Long-term random sampling of water quality conditions throughout waterbodies allows scientific assessment of water quality trends. CCHMN field and laboratory partners collect and analyze water samples from 60 randomly selected field sites throughout 10 waterbodies each month, including Lemon Bay, Cape Haze/Gasparilla Sound, Charlotte Harbor, Pine Island Sound, Matlacha Pass, San Carlos Bay, Estero Bay and the Tidal Myakka, Peace, and Caloosahatchee Rivers. Fifteen water quality parameters are measured and analyzed using consistent field and laboratory methods (CHNEP 2015 and CHNEP 2016 and CHNEP 2019) following FDEP 2017 SOPs (Effective 4/16/2018) Field testing overall – FT 1000.

Data are uploaded biannually by partners to WIN (Watershed Information Network), previously called STORET (Storage and Retrieval), a standard, common public database maintained by the Florida Department of Environmental Protection (FDEP). CCHMN supplements other ongoing water quality monitoring programs implemented by partners, including ongoing fixed station monitoring by counties, cities, agencies, and citizen scientists. The water quality data provided by the CCHMN is an essential component of many water quality assessments and resource management decisions throughout the CHNEP estuarine and tidal waters. The CCHMN is currently funded by a partnership of Southwest Florida Water Management District (SWFWMD), Charlotte County, Lee County, the City of Cape Coral, Florida Department of Environmental Protection (FDEP), and CHNEP. Field sampling is conducted by Florida Fish and Wildlife Conservation Commission (FWC) Charlotte Harbor Field Laboratory, City of Cape Coral, FDEP Environmental Assessment and Restoration South Regional Operations, and Lee County Environmental Laboratory. Laboratory analyses are conducted by a partnership with Charlotte County (Benchmark Laboratory), City of Cape Coral Laboratory and Lee County Environmental Laboratory.

Additionally, CHNEP's county and municipal partners listed below and established volunteer programs such as such as the Charlotte Harbor Environmental Volunteer Water Quality Monitoring Network (CHEVWQMN), Cape Coral Canal Watch, and Lee County Pond Watch collect and analyze water quality data through fixed station monitoring programs. This data is also used for scientific assessment of water quality trends and is an essential component of water quality assessments and resource management decisions throughout the CHNEP watersheds and waterbodies.

Total Nitrogen - Period of Record (All Available Data)

The map below shows the trend being experienced at the long-term monitoring stations spread throughout the CHNEP area.

View Data Details

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Note: Trends were prepared on October 7, 2022 using the latest available data. Results presented replace all previous editions.

Download Trend Analysis Output

You can download raw data for your own analysis by clicking on the link below. The data is formatted as a ZIP file containing raw and calculated data, methods documentation, and an R script.

Download (ZIP, ~ 10MB)

Note: Trends were prepared on October 7, 2022 using the latest available data. Results presented replace all previous editions.

Map Legend

  • Increasing Trend, Larger Rate Improving
  • Increasing Trend, Smaller Rate Improving
  • No Trend
  • Decreasing Trend, Smaller Rate Declining
  • Decreasing Trend, Larger Rate Declining
  • CHNEP Basin Boundary
  • CHNEP Sampling Strata

Map Legend

  • Increasing Trend, Larger Rate Declining
  • Increasing Trend, Smaller Rate Declining
  • No Trend
  • Decreasing Trend, Smaller Rate Improving
  • Decreasing Trend, Larger Rate Improving
  • CHNEP Basin Boundary
  • CHNEP Sampling Strata

Map Legend

  • Increasing Trend, Larger Rate
  • Increasing Trend, Smaller Rate
  • No Trend
  • Decreasing Trend, Smaller Rate
  • Decreasing Trend, Larger Rate
  • CHNEP Basin Boundary
  • CHNEP Sampling Strata

Contacts

For more information, please contact the Coastal & Heartland National Estuary Partnership:

Agency Summary

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

Agency Period of Record Data Last Loaded Max Year
Cape Coral Canal Watch 5/3/1995 - 3/3/2021 9/24/2021 2021
CCHMN - City of Cape Coral 3/17/1986 - 5/19/2022 1/4/2023 2022
CCHMN - Coastal Charlotte Harbor Monitoring Network (CCHMN) - Matlacha Pass 3/20/2002 - 8/25/2022 1/4/2023 2022
CCHMN - Lee County Environmental Laboratory 5/10/1989 - 1/4/2023 1/21/2023 2023
CCHMN - SWFWMD Water Quality Sampling Data 1/1/1991 - 2/3/2022 1/4/2023 2022
City of Sanibel, Natural Resources Department 1/22/2002 - 6/16/2022 1/4/2023 2022
FDEP Charlotte Harbor Aquatic/Buffer Preserves Sampling Data 11/4/1996 - 11/7/2022 1/4/2023 2022
FDEP South District Sampling Data 1/26/1999 - 11/29/2022 1/4/2023 2022
FDEP Southwest Regional Operations Center 5/14/1997 - 11/3/2022 1/4/2023 2022
FDEP Watershed Monitoring Section 10/5/1998 - 10/19/2022 1/4/2023 2022
Florida LAKEWATCH 1/15/1988 - 11/16/2022 1/4/2023 2022
Manatee County Environmental Management Sampling Data 1/11/1995 - 6/23/2022 1/4/2023 2022
Peace River Manasota Regional Water Supply Authority (FL) 2/9/1993 - 12/28/2021 1/4/2023 2021
Polk County Parks & Natural Resources Department 7/25/1984 - 12/19/2022 1/4/2023 2022
Sarasota County Coastal Creeks 2/24/1998 - 12/22/2021 2/24/2022 2021
Sarasota County Environmental Services Department Sampling Data 2/24/1998 - 11/2/2022 1/23/2023 2022
SWFWMD Hydrologic Data Section Data 5/1/1930 - 1/26/2023 1/27/2023 2023
USGS National Water Information System 10/25/1907 - 1/27/2023 1/28/2023 2023
Water quality data collected by the City of Lakeland 8/10/1966 - 6/8/2021 9/24/2021 2021