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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
501–525 of 812Wysox Twp Municipal Authority
PA2080030 · 1,763 served
Ridgway Twp Water Auth
PA6240022 · 1,763 served
Pawc Blue Mt Lake
PA2450133 · 1,753 served
East Berlin Area Joint Auth
PA7010003 · 1,750 served
North Warren Muni Authority
PA6620028 · 1,749 served
Reade Twp Muni Auth
PA4110297 · 1,746 served
Waterside Loysburg Water Suppl
PA4050035 · 1,724 served
Braddock Boro Water Auth
PA5020007 · 1,708 served
Mont Alto Municipal Authority
PA7280040 · 1,705 served
Plumstead Twp Patriots Ridge
PA1090148 · 1,704 served
Richland Boro Water Supply
PA7380032 · 1,700 served
Shamokin Dam Borough
PA4550022 · 1,700 served
Cresson Boro Water Sys
PA4110030 · 1,700 served
Us Army Garrison
PA7210010 · 1,700 served
Waterford Municipal Authority
PA6250065 · 1,700 served
Clymer Boro Muni Auth
PA5320009 · 1,700 served
Covington Karthaus Girard a a
PA6170045 · 1,700 served
Gilpin Twp Muni Auth
PA5030010 · 1,680 served
Saxton Muni Water Auth
PA4050021 · 1,675 served
Blacklick Valley Muni Auth
PA4110077 · 1,650 served
Blossburg Municipal Authority
PA2590033 · 1,650 served
Pa Amer Water Co Lake Heritage
PA7010035 · 1,648 served
Catawissa Municipal Water Auth
PA4190011 · 1,644 served
Elverson Water Company
PA1150191 · 1,641 served
Leacock Twp Mun Auth
PA7360084 · 1,640 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