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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
801–812 of 812Perkiomen Crossing
PA1460087 · 508 served
Orangeville Municipal Water Au
PA4190012 · 508 served
Lyons Boro
PA3060096 · 500 served
Aqua Pa Superior Center Point
PA1460092 · 500 served
S R Water
PA3130053 · 500 served
Pike County Correctional Facil
PA2520107 · 500 served
Aqua Pa Water Co Thornhurst Cc
PA2350053 · 500 served
Icmsa Rossiter
PA5320034 · 500 served
Aqua Pa Pinecrest
PA2450086 · 500 served
Keystone Job Corps Center
PA2400023 · 500 served
Scma Orwigsburg Consecutive
PA3540075 · 500 served
Ulster Municipal Authority
PA2080032 · 500 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.
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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