Centre County, Pennsylvania: drinking water report. Centre County in central Pennsylvania has about 162,000 residents, including State College and Penn
Centre County in central Pennsylvania has about 162,000 residents, including State College and Penn State University. The State College Borough Water Authority draws from a network of wells tapping the karst limestone aquifer beneath the Nittany Valley. Karst geology – characterized by sinkholes, caves, and underground streams – means water moves quickly through the subsurface with minimal natural filtration.
PFAS contamination from multiple sources has affected Centre County's groundwater. According to the Pennsylvania DEP's 2024 PFAS investigation, the former State College Air Depot (now a commercial area along North Atherton Street) used AFFF firefighting foam during military operations. Groundwater monitoring showed combined PFAS at 32 ppt, with PFOS alone at 18 ppt – above the federal MCL of 4 ppt.
The karst aquifer accelerates contamination migration. A 2024 Penn State Institutes of Energy and the Environment study documented that dye tracers injected at the surface reached production wells 1.5 miles away in under 48 hours, demonstrating how quickly contaminants can travel through the limestone. Nitrate from agricultural operations in the Penns Valley area adds to the groundwater quality burden.
Karst geology means contamination can show up quickly and from unexpected directions. The State College Borough Water Authority has been proactive about PFAS monitoring, but private well owners in the surrounding townships bear responsibility for their own testing.
Check your water for current data. For the combination of PFAS and agricultural nitrate found in Centre County, reverse osmosis at the tap is the most effective single solution. Our water filter guide evaluates systems for karst-sourced water. Pull your detailed report for trend data, and visit our Pennsylvania page for statewide context.
Drinking water is one exposure route. These federal datasets also cover Centre County, PA.
The EPA places Centre County, PA in Zone 1 - the EPA's highest-risk category, where the predicted average indoor radon level is above 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.
51% of homes in Centre County, PA were built before 1980, and 18% 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 Centre County, PA 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