Private Well Water Testing in Florida
County-by-county USGS area-risk estimates for private wells across Florida — arsenic exceedance probability and private-well population — plus how to test your own well at a Florida-certified laboratory.
Florida private-well risk summary
Counties covered
67
Florida counties with modeled risk data.
People on private wells
area estimate1,926,808
estimated across covered Florida counties.
Average arsenic risk
area estimate2%
average modeled chance a well exceeds 10 µg/L arsenic across covered counties.
Florida counties
- Hillsborough County3% arsenic exceedance (area estimate)131,914 people on private wells
- Marion County1% arsenic exceedance (area estimate)97,040 people on private wells
- Duval County2% arsenic exceedance (area estimate)89,830 people on private wells
- Polk County1% arsenic exceedance (area estimate)84,872 people on private wells
- Palm Beach County2% arsenic exceedance (area estimate)82,370 people on private wells
- Pasco County3% arsenic exceedance (area estimate)60,960 people on private wells
- Orange County1% arsenic exceedance (area estimate)58,204 people on private wells
- Lake County1% arsenic exceedance (area estimate)55,257 people on private wells
- Volusia County2% arsenic exceedance (area estimate)54,131 people on private wells
- Putnam County2% arsenic exceedance (area estimate)47,972 people on private wells
- Miami-Dade County4% arsenic exceedance (area estimate)46,897 people on private wells
- St. Lucie County2% arsenic exceedance (area estimate)45,952 people on private wells
- Citrus County4% arsenic exceedance (area estimate)44,246 people on private wells
- Lee County4% arsenic exceedance (area estimate)43,862 people on private wells
- Sarasota County3% arsenic exceedance (area estimate)42,896 people on private wells
- Alachua County1% arsenic exceedance (area estimate)39,072 people on private wells
- Brevard County3% arsenic exceedance (area estimate)38,350 people on private wells
- Bay County5% arsenic exceedance (area estimate)36,508 people on private wells
- Martin County2% arsenic exceedance (area estimate)35,659 people on private wells
- Clay County2% arsenic exceedance (area estimate)35,238 people on private wells
- Columbia County1% arsenic exceedance (area estimate)35,154 people on private wells
- St. Johns County3% arsenic exceedance (area estimate)33,908 people on private wells
- Collier County4% arsenic exceedance (area estimate)32,126 people on private wells
- Nassau County2% arsenic exceedance (area estimate)31,959 people on private wells
- Jackson County1% arsenic exceedance (area estimate)29,890 people on private wells
- Suwannee County2% arsenic exceedance (area estimate)28,766 people on private wells
- Indian River County2% arsenic exceedance (area estimate)27,836 people on private wells
- Seminole County1% arsenic exceedance (area estimate)27,175 people on private wells
- Levy County3% arsenic exceedance (area estimate)26,236 people on private wells
- Leon County2% arsenic exceedance (area estimate)24,937 people on private wells
- Hernando County4% arsenic exceedance (area estimate)23,762 people on private wells
- Sumter County2% arsenic exceedance (area estimate)22,839 people on private wells
- Osceola County1% arsenic exceedance (area estimate)22,775 people on private wells
- Manatee County2% arsenic exceedance (area estimate)20,809 people on private wells
- Highlands County2% arsenic exceedance (area estimate)20,005 people on private wells
- Broward County2% arsenic exceedance (area estimate)19,572 people on private wells
- Walton County3% arsenic exceedance (area estimate)19,398 people on private wells
- Baker County1% arsenic exceedance (area estimate)18,641 people on private wells
- Bradford County1% arsenic exceedance (area estimate)16,759 people on private wells
- Okeechobee County1% arsenic exceedance (area estimate)16,505 people on private wells
- Washington County2% arsenic exceedance (area estimate)15,589 people on private wells
- Gadsden County2% arsenic exceedance (area estimate)15,515 people on private wells
- Wakulla County4% arsenic exceedance (area estimate)14,492 people on private wells
- DeSoto County3% arsenic exceedance (area estimate)14,142 people on private wells
- Gilchrist County1% arsenic exceedance (area estimate)13,900 people on private wells
- Hardee County1% arsenic exceedance (area estimate)13,399 people on private wells
- Taylor County3% arsenic exceedance (area estimate)13,382 people on private wells
- Hendry County4% arsenic exceedance (area estimate)12,785 people on private wells
- Holmes County1% arsenic exceedance (area estimate)12,591 people on private wells
- Dixie County3% arsenic exceedance (area estimate)11,384 people on private wells
- Madison County1% arsenic exceedance (area estimate)11,250 people on private wells
- Jefferson County2% arsenic exceedance (area estimate)10,143 people on private wells
- Charlotte County4% arsenic exceedance (area estimate)9,538 people on private wells
- Calhoun County2% arsenic exceedance (area estimate)9,338 people on private wells
- Union County1% arsenic exceedance (area estimate)8,825 people on private wells
- Gulf County3% arsenic exceedance (area estimate)8,736 people on private wells
- Santa Rosa County2% arsenic exceedance (area estimate)8,466 people on private wells
- Okaloosa County3% arsenic exceedance (area estimate)8,184 people on private wells
- Hamilton County2% arsenic exceedance (area estimate)8,134 people on private wells
- Lafayette County2% arsenic exceedance (area estimate)6,879 people on private wells
- Pinellas County5% arsenic exceedance (area estimate)6,615 people on private wells
- Flagler County2% arsenic exceedance (area estimate)6,062 people on private wells
- Liberty County3% arsenic exceedance (area estimate)4,501 people on private wells
- Glades County2% arsenic exceedance (area estimate)4,392 people on private wells
- Escambia County4% arsenic exceedance (area estimate)3,279 people on private wells
- Franklin County5% arsenic exceedance (area estimate)2,752 people on private wells
- Monroe County6% arsenic exceedance (area estimate)2,253 people on private wells
Find a Florida-certified testing lab
Get your well tested at a Florida-certified laboratory. We list certification programs by state.
These figures are USGS area estimates: statistical groundwater models describing how likely elevated contaminant levels are across a county. They are not designed to predict the concentration in any single well. Only testing your own well reveals its water quality.
By TapWaterData Editorial
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