St. Petersburg Water Quality: Tampa Bay, Beaches and Lakes

St. Petersburg water is tested by several bodies: Pinellas County Environmental Management for lakes, creeks and the bay, the Florida Department of Health for beach bacteria, the Florida Department of Environmental Protection for algae blooms, and the city for tap water.

Pinellas County says it monitors surface water quality to provide long-term assessments of water quality, measure success of management efforts and meet regulatory program requirements, and it posts the results on a water quality dashboard (Pinellas County). The Environmental Management Division, part of Public Works, answers at (727) 464-4425 (Pinellas County).

Tap water is a separate system. The city says St. Pete drinking water comes from a combination of ground and surface water, which undergoes a three-step treatment process, and that all city potable water is disinfected using chloramines; the 2025 Drinking Water Quality Report is posted on the same page, and the Water Resources Department answers at 727-893-7261 (City of St. Petersburg).

Yes, Tampa Bay off St. Petersburg has had better water clarity since the 1980s, and 2024 district mapping found the first Tampa Bay seagrass increase since 2016.

The Tampa Bay Estuary Program dates the turnaround to intensive nutrient reductions by the late 1970s, most notably wastewater treatment improvements in 1979, followed by better water clarity and lower chlorophyll bay-wide in the 1980s, with conditions generally remaining constant to the present day (Tampa Bay Estuary Program). Its annual report card assigns each bay segment, Old Tampa Bay, Hillsborough Bay, Middle Tampa Bay and Lower Tampa Bay, a management action for each year based on measured water quality, relative to management targets, and a 2025 report card is posted.

Seagrass is the bay's report card in living form. The Suncoast saw modest gains in Tampa Bay and Sarasota Bay, which marks the first seagrass increase in these estuaries since 2016, according to the district, which mapped the region from early 2024 imagery, before the 2024 hurricane season, and it says the gains could mark the beginning of a recovery since the 2017 to 2019 red tide (Southwest Florida Water Management District). The next mapping cycle for the Suncoast is in 2026, according to the district. Between maps, the estuary program tracks seagrass transects collected each year at over sixty locations in Tampa Bay (Tampa Bay Estuary Program).

Beaches near St. Petersburg are rated by the Florida Department of Health on enterococci counts: Good is 0 to 35 per 100 milliliters of marine water, Moderate 36 to 70, and Poor 71 or more.

The state sets those three categories, posts results and any advisories on individual county pages and offers an interactive map (Florida Department of Health). The department says changes to funding levels in 2011 resulted in a return to bi-weekly sampling, the elimination of all fecal coliform sampling and a reduction in the number of sample locations; the page does not give a current sampling schedule for Pinellas beaches.

The city's own beaches sit on different waters. Spa Beach and North Shore Beach offer sandy spots along the Tampa Bay waterfront downtown, with Spa Beach at the base of the St. Pete Pier, Maximo Beach in South St. Pete has an observation tower looking out on the Gulf of Mexico and Boca Ciega Bay, and St. Pete Municipal Beach at 11260 Gulf Blvd. is on the shores of Treasure Island (City of St. Petersburg). Checking the state map for the nearest sampled point before a swim is the practical step.

Red tide along the St. Petersburg coast is tracked through Pinellas County Environmental Management and the Florida Fish and Wildlife Conservation Commission, while freshwater blue-green algae in St. Pete lakes falls to the Florida Department of Environmental Protection.

Pinellas County explains that the most common red tide organism in Florida is the dinoflagellate Karenia brevis, and that while it occurs naturally, nutrient enrichment of coastal waters can make blooms worse and longer-lasting (Pinellas County). Fish kills go to FWC online or by phone at (800) 636-0511, and the county page links a red tide monitoring map with the latest results.

Blooms in St. Pete lakes follow a different chain. The Florida Department of Environmental Protection is the lead agency for environmental monitoring of the state's water quality and responds to algal blooms in public lakes, rivers, streams and estuaries; blooms can be reported at ReportAlgalBloom.com or toll-free at 1-855-305-3903 (Florida Department of Environmental Protection). A pond owned by a homeowners association is the association's responsibility, according to the department.

Pinellas County bans the sale and use of lawn fertilizer containing nitrogen or phosphorus from June 1 to Sept. 30, the rainy season, and county law forbids dumping any waste into the Pinellas County storm drainage system.

The county says years of excess fertilizer have overloaded Pinellas waters with nutrients that feed blooms such as red tide, so from June 1 to Sept. 30 Pinellas County prohibits the sale and use of lawn or landscape fertilizer containing nitrogen or phosphorus (Pinellas County). The county also reminds residents that the fertilizer-free zone begins 10 feet back from the top of the slope towards any seawall or body of water, and it advises no more than four pounds of nitrogen per 1,000 square feet per year.

Storm drains are the other route into the bay. Pinellas County law prohibits the dumping of any waste, including chemicals, oil, sewage, trash and yard waste, into the county storm drainage system, and prohibited connections can be reported to the Environmental Management Hotline at (727) 464-4425 or [email protected] (Pinellas County). Twice a year the county and Keep Pinellas Beautiful run the Cross Bayou and Joe's Creek Waterways Cleanup, where volunteers paddle to mangrove islands and collect over 2,000 pounds of trash.

St. Petersburg is rebuilding its water system under the St. Pete Water Plan, which covers drinking water, reclaimed water, wastewater, stormwater and natural water bodies, and has finished a Florida Department of Environmental Protection consent order project to address wet weather overflows.

The city says much of its infrastructure, most of which was developed from 1930-1980, has reached or exceeded its design lifespan, and that since 2015 it has invested about $2 billion to operate, maintain and repair it (City of St. Petersburg). The Water Plan, completed in 2019, identified a required investment of approximately $3.5 billion in water resources infrastructure.

One finished project shows what the consent order meant on the ground. Lift Station 87, at 690 43rd Street South in the Childs Park area, was required by Florida Department of Environment Protection Consent Order No. 16-1280 to address wet weather overflows, and it lets operators send heavy rain flows to either the Northwest or the Southwest Water Reclamation Facility (City of St. Petersburg).

Smaller fixes target the lakes. In May 2023 the city installed its first floating wetland in Jungle Lake in Walter Fuller Park, with Keep Pinellas Beautiful and the SOUL urban lakes group, to capture nutrients from the water, and a Stormwater Master Plan within the Water Plan aims to improve stormwater quality, reduce flooding and plan for sea level rise (City of St. Petersburg). Last verified: October 15, 2026, on the City of St. Petersburg and Pinellas County websites.