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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
126–150 of 812Shillington Muni Auth
PA3060067 · 13,300 served
Boro of Waynesboro
PA7280032 · 13,200 served
Whitehall Twp Authority
PA3390081 · 13,063 served
E Stroudsburg Boro Water Dept
PA2450023 · 13,000 served
Aqua Pa Hatboro
PA1460028 · 12,901 served
Quakertown Boro
PA1090082 · 12,800 served
Bear Valley Joint Auth
PA7280043 · 12,589 served
Pa Amer Water Co Brownell
PA2359001 · 12,560 served
Summit Township Water Authorit
PA6250090 · 12,500 served
Gettysburg Muni Auth
PA7010019 · 12,425 served
Dallastown Yoe Water Auth
PA7670085 · 12,300 served
Paw Huntsville
PA2409013 · 11,987 served
South Middleton Twp Water Auth
PA7210050 · 11,695 served
Findlay Twp Municipal Auth
PA5020078 · 11,460 served
Pa-american Water Co-connellsv
PA5260022 · 11,425 served
Aqua Pa Superior Main System
PA1460085 · 11,400 served
Municipal Authority Sunbury
PA4490007 · 11,043 served
Mt Penn Boro Muni Auth
PA3060082 · 10,400 served
Richland Twp Water Authority
PA5020018 · 10,190 served
Tri Cnty Jt Muni Auth
PA5630045 · 10,100 served
City of Lock Haven Water Dept
PA4180048 · 10,000 served
West Manchester Twp Auth
PA7670101 · 9,960 served
Downingtown Water Authority
PA1150026 · 9,900 served
Paw Crystal Lake
PA2409003 · 9,773 served
Suburban Lock Haven Water Auth
PA4180049 · 9,700 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