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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
701–725 of 812Hickory Hills Mhc
PA3480015 · 800 served
E Bangor Mun Authority
PA3480049 · 800 served
Washington Twp Water System
PA6250092 · 797 served
Aqua Pa White Rock Acres Sys
PA7210048 · 790 served
Nicholson Boro Auth
PA2660011 · 789 served
West Lebanon Twp Water Supply
PA7380040 · 780 served
Mt Village Mhp
PA3060095 · 771 served
Eisenhower Water Supply
PA7010048 · 760 served
Sankertown Boro Water Sys
PA4110007 · 760 served
Snake Spring Township Ma
PA4050038 · 750 served
Hidden Valley Resort Lp
PA4560049 · 750 served
Quarryville Presby Ret Comm
PA7360167 · 750 served
Charles Cole Memorial Hospital
PA6530015 · 750 served
Warriors Mark Gen Auth
PA4310031 · 750 served
Richland Meadows Mhp
PA1090052 · 750 served
Hulmeville Municipal Authority
PA1090140 · 750 served
Clarks Summit State Hospital
PA2350028 · 747 served
South Park Mhc Llc
PA5630077 · 740 served
Monroe County Correctional Fac
PA2450105 · 740 served
Gratz Boro Water Revenue Fund
PA7220005 · 738 served
Scma Pinebrook
PA3540054 · 735 served
Redwood Estates Pa Llc
PA5020084 · 725 served
Salisbury Boro Water Comm
PA4560041 · 725 served
Beth 512 System
PA3480814 · 725 served
Penns Creek Municipal Auth
PA4550019 · 725 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