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.