Cambria County, Pennsylvania: drinking water report. Cambria County in western Pennsylvania has about 131,000 residents, centered on Johnstown and…
Cambria County in western Pennsylvania has about 131,000 residents, centered on Johnstown and surrounding communities. The county draws from surface reservoirs and groundwater, with Greater Johnstown Water Authority serving the largest population. Coal mining defined this region's economy for over a century, and abandoned mine drainage remains the single largest water quality issue – thousands of abandoned mine openings discharge acid-laden water into streams throughout the county.
According to the Pennsylvania DEP's 2024 abandoned mine drainage assessment, over 240 miles of streams in Cambria County are impaired by mine drainage. The acidic water dissolves iron, manganese, aluminum, and sulfate from exposed rock, turning streams orange and making them biologically dead. While treatment plants that draw from surface reservoirs manage these inputs through chemical treatment, smaller systems and private wells in mining areas face more direct exposure.
Manganese is a particular concern for private well users. A 2024 Penn State Extension study found that 28% of tested private wells in Cambria County exceeded the EPA's health advisory level of 300 ppb for manganese – a metal linked to neurological effects at high concentrations, particularly in children.
Coal country water requires specific attention. If your water has an orange tint or metallic taste, those are visible signs of elevated iron and manganese from mine drainage. But manganese at health-relevant concentrations can be invisible and tasteless.
Start by checking your water for available data. For iron and manganese, oxidation filters or whole-house systems designed for mine-affected water are the most practical option. Our water filter guide covers systems suited to Appalachian well water. Pull your detailed report for local trends, and visit our Pennsylvania page for statewide context.
Drinking water is one exposure route. These federal datasets also cover Cambria County, PA.
The EPA places Cambria County, PA 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.
81% of homes in Cambria County, PA were built before 1980, and 42% 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 Cambria County, PA averages 8 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