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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
401–425 of 812Bonneauville Muni Water Auth
PA7010012 · 2,730 served
Pine Grove Boro Water System
PA3540037 · 2,711 served
Elizabethville Area Auth
PA7220003 · 2,700 served
Montgomery Water Authority
PA4410161 · 2,700 served
Albert Gallatin Muni Auth
PA5260027 · 2,695 served
Bath Municipal Water Works
PA3480066 · 2,680 served
Community Utilites Westgate
PA3480024 · 2,668 served
Elkland Boro Water Authority
PA2590035 · 2,660 served
Aqua Pa Beech Mountain
PA2400114 · 2,646 served
Weatherly Boro Mun Auth
PA3130015 · 2,612 served
Western Clinton Co Mun Auth
PA4180058 · 2,610 served
Plumstead Northern System
PA1090144 · 2,605 served
Bentleyville Muni Auth
PA5630030 · 2,600 served
Ontelaunee Township
PA3060098 · 2,598 served
Port Allegany Water Department
PA6420021 · 2,591 served
Coopersburg Mun Water Auth
PA3390046 · 2,570 served
Meyersdale Muni Auth
PA4560012 · 2,566 served
Blair Twp Water & Sewer Auth
PA4070011 · 2,550 served
Scma-tremont
PA3540046 · 2,515 served
Biglerville Water Co
PA7010020 · 2,501 served
Plum Creek Municipal Auth
PA3540049 · 2,500 served
Greenfield Twp Muni Auth
PA4070058 · 2,500 served
Cresson Twp Muni Auth
PA4110038 · 2,500 served
Red Hill Water Authority
PA1460039 · 2,500 served
Berlin Boro Muni Auth
PA4560029 · 2,468 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