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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
626–650 of 812Borough of Howard
PA4140080 · 1,001 served
Cambria Twp Water Auth
PA4110006 · 1,000 served
Selinsgrove Center
PA4550800 · 1,000 served
St Paul Homes
PA6430024 · 1,000 served
Thompsontown Muni Auth
PA4340007 · 1,000 served
Rural Valley Water Works
PA5030012 · 1,000 served
Sugarcreek Borough
PA6610044 · 1,000 served
Rock Spring Water Co
PA4140085 · 1,000 served
Richfield Area Joint Auth
PA4340009 · 1,000 served
Torrance State Hospital
PA5650036 · 997 served
New Berlin Municipal Authority
PA4600010 · 990 served
Croyle Twp Water Auth
PA4110299 · 989 served
Kreamer Mun Auth
PA4550014 · 980 served
Riegelsville Water Authority
PA1090058 · 980 served
New Milford Municipal Auth
PA2580019 · 979 served
Heidelberg Twp Muni Auth
PA7380033 · 975 served
Antrim Township Municipal Auth
PA7280063 · 975 served
Trumbauersville Mun Waterworks
PA1090091 · 974 served
Aqua Pa Mt Jewett
PA6420018 · 972 served
Millville Municipal Authority
PA4190017 · 969 served
Beaver Meadows Borough
PA3130002 · 968 served
Lca Washington Township Div
PA3390078 · 965 served
Peddlers Village
PA1090153 · 960 served
Huston Twp Muni Auth
PA6170024 · 960 served
Aqua Pa Eagle Rock Utilities
PA3540070 · 956 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