Seminole County, Florida: drinking water report. Seminole County sits north of Orlando, home to about 480,000 residents in communities like Sanford,…
Seminole County sits north of Orlando, home to about 480,000 residents in communities like Sanford, Altamonte Springs, and Lake Mary. Water comes primarily from the Floridan Aquifer, with Seminole County Environmental Services and several city utilities operating the systems. The county was also the site of the former Sanford Naval Air Station.
Seminole County's aquifer water is typical of central Florida – hard, sometimes sulfurous, and requiring treatment. UCMR5 data shows PFAS detections in several county systems. The former Sanford Naval Air Station is a confirmed PFAS source, and the Central Florida SunRail commuter corridor passes through areas with documented contamination.
According to the Florida DEP's 2024 monitoring data, five public water systems in Seminole County reported PFAS above detection thresholds. The county has been investing in treatment upgrades to address both PFAS and naturally occurring contaminants.
Seminole County's PFAS situation is driven by the former naval air station. Areas near the former base face the most documented contamination.
Check your water for data specific to your provider. Reverse osmosis handles PFAS, hardness, and sulfide taste. Our water filter guide covers options for Florida's water challenges. Pull your detailed report, and visit our Florida page for statewide data.
Drinking water is one exposure route. These federal datasets also cover Seminole County, FL.
The EPA places Seminole County, FL in Zone 3 - the EPA's lowest-risk category, with a predicted average indoor radon level below 2 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.
31% of homes in Seminole County, FL were built before 1980, and 2% 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 Seminole 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