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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
226–250 of 812Pa American Water Steelton
PA7220036 · 6,428 served
Kennett Square Mun Water Works
PA1150108 · 6,328 served
Somerset Boro Muni Water Auth
PA4560042 · 6,309 served
Brookville Municipal Auth
PA6330004 · 6,220 served
East Petersburg Borough
PA7360135 · 6,215 served
Titusville Municipal Water
PA6200051 · 6,146 served
Washington Twp Muni Auth
PA7280026 · 6,134 served
Belle Vernon Boro Muni Auth
PA5260004 · 6,000 served
Schuylkill Haven Boro Water
PA3540041 · 6,000 served
College Twp Water Authority
PA4140082 · 6,000 served
Aqua Pa Chalfont
PA1090005 · 5,900 served
Buffalo Twp Mun Auth Freeport
PA5030019 · 5,849 served
North East Township Water
PA6250086 · 5,848 served
Albion Borough
PA6250007 · 5,842 served
Coraopolis Water & Sewer Auth
PA5020010 · 5,804 served
Mt Union Municipal Auth
PA4310016 · 5,801 served
Hellertown Borough Authority
PA3480052 · 5,800 served
Beaver Boro Muni Auth
PA5040009 · 5,799 served
Hilltown Twp Water&sewer Auth
PA1090117 · 5,770 served
Pa American Water Co Kane
PA6420019 · 5,725 served
Lower Saucon Authority
PA3480027 · 5,700 served
Selinsgrove Muni Auth
PA4550005 · 5,584 served
Mahanoy Twp Auth
PA3540011 · 5,584 served
Paw Frackville
PA3540032 · 5,583 served
Duquesne Water Dept
PA5020012 · 5,565 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