Polk County, Florida: drinking water report. Polk County sits in central Florida between Tampa and Orlando, home to about 750,000 residents.
Polk County sits in central Florida between Tampa and Orlando, home to about 750,000 residents. Water comes primarily from the Floridan Aquifer, with the City of Lakeland, the City of Winter Haven, and Polk County Utilities operating the largest systems. The county's agricultural legacy – phosphate mining and citrus farming – has left a mark on both surface water and groundwater quality that persists decades after many operations closed.
Phosphate mining is the defining water quality influence in Polk County. The Bone Valley Formation, which stretches across the county, has been mined for phosphate since the 1880s. Mining operations leave behind clay settling ponds, disturbed geology, and elevated concentrations of naturally occurring radium and uranium in groundwater. According to the Florida DEP, several Polk County water systems have required treatment for gross alpha radiation, which indicates the presence of radioactive elements.
UCMR5 data shows PFAS detections in some county systems, but at levels generally lower than in Florida counties with major military installations. The phosphate mining legacy and associated radionuclides are the more pressing concern here.
Radionuclides and mineral content are the specific concerns that set Polk County apart from most Florida counties. A standard carbon filter will not address these.
Check your water to see what your system reports for radionuclides and PFAS. For radium and gross alpha removal, reverse osmosis is the most effective household option. Our water filter guide covers which systems handle Florida's unique contaminant mix. Pull your detailed report, and see our Florida page for statewide data.
Drinking water is one exposure route. These federal datasets also cover Polk County, FL.
The EPA places Polk County, FL in Zone 2 - a moderate-risk category, with a predicted average indoor radon level between 2 and 4 pCi/L. Zone maps predict an area's radon potential from geology and existing indoor readings; they say nothing about a specific house. Testing is the only way to know your own level.
32% of homes in Polk County, FL were built before 1980, and 5% before 1950. Residential lead paint was banned in 1978, so housing age is the strongest available proxy for lead-paint exposure. This describes the county's housing stock, not any one home.
Modelled annual fine-particle pollution (PM2.5) in Polk County, FL averages 7.6 µg/m³, within the EPA's annual standard of 9 µg/m³. These are CDC modelled county estimates rather than readings from a specific monitor.
How radon zones work · Air quality by county · Lead exposure guide