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Pennsylvania Water Quality
812
Utilities in database
11.3M
Residents served
30%
On private wells
3
Key contaminants tracked
Drinking Water in Pennsylvania
Pennsylvania has 812 community water systems serving approximately 11.3 million residents. Primary water sources include groundwater. The most commonly reported contaminants include disinfection byproducts, lead, nitrates. 30% of Pennsylvania residents rely on private wells. DEP holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Pennsylvania
251–275 of 812Aqua Pa Water Co Honesdale
PA2640018 · 5,500 served
Greencastle Area Water Auth
PA7280014 · 5,500 served
Birdsboro Muni Water Auth
PA3060010 · 5,353 served
Tunkhannock Boro Munic Auth
PA2660014 · 5,349 served
Oxford Borough
PA1150066 · 5,280 served
Stewartstown Boro Water Auth
PA7670062 · 5,206 served
Schwenksville Borough Auth
PA1460042 · 5,200 served
Mun Auth of Boro of Bedford
PA4050002 · 5,127 served
Aqua Pa Flying Hills Wa Sys
PA3060018 · 5,100 served
Sharpsville Boro Water Co
PA6430055 · 5,029 served
Towanda Municipal Authority
PA2080029 · 5,000 served
Danville Municipal Water Auth
PA4470007 · 4,992 served
Hamburg Muni Water&sewer Auth
PA3060035 · 4,990 served
Montoursville Water Company
PA4410175 · 4,983 served
Tarentum Boro Water Dept
PA5020055 · 4,927 served
Central Indiana Co Water Auth
PA5320040 · 4,920 served
London Grove Twp Mun Auth
PA1150165 · 4,770 served
Buckingham Twp Cold Spring
PA1090137 · 4,760 served
Shrewsbury Borough
PA7670088 · 4,727 served
Ridgway Borough Water System
PA6240012 · 4,700 served
Fawn Frazer Jt Water Auth
PA5020076 · 4,650 served
Pa American Water Kittanning
PA5030008 · 4,617 served
Freeland Boro Muni Water Auth
PA2400054 · 4,610 served
North East Borough Water Dept
PA6250061 · 4,601 served
Upper Hanover Water Authority
PA1460036 · 4,600 served
Key Contaminant Concerns in Pennsylvania
Lead
Lead is a naturally occurring heavy metal that was widely used in plumbing infrastructure until it was banned for new installations in 1986. An estimated 9.2 million lead service lines still connect homes to public water mains across the United States, along with millions of homes with lead solder in their internal plumbing.
Nitrates
Nitrate (NO₃⁻) is a nitrogen-containing compound that forms naturally through the decomposition of organic matter. At elevated concentrations — almost always from human activity — nitrate interferes with the blood's ability to carry oxygen. The United States produces over 23 million tons of nitrogen fertilizer annually, making agricultural runoff the dominant source of nitrate contamination.
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
Pennsylvania Water FAQs
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Data source: Utility data from EPA SDWIS. 812 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-18