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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
201–225 of 812Maidencreek Twp Water Auth
PA3060012 · 7,505 served
Littlestown Boro
PA7010022 · 7,300 served
Upper Saucon Twp Water Supply
PA3390077 · 7,300 served
Minersville Municipal Water Au
PA3540035 · 7,275 served
Blythe Twp Municipal Authority
PA3540017 · 7,100 served
Womelsdorf Robesonia Jt Auth
PA3060080 · 7,070 served
Pawc Saw Creek Estates
PA2520062 · 7,016 served
Indian Creek Valley Water Auth
PA5260011 · 7,000 served
Palmerton Municipal Authority
PA3130012 · 7,000 served
Richland Twp Water Authority
PA1090131 · 6,800 served
Sewickley Boro Water Auth
PA5020050 · 6,800 served
Neville Twp Water Dept
PA5020029 · 6,750 served
Manor Twp Jt Muni Auth
PA5030006 · 6,744 served
East Cocalico Township
PA7360113 · 6,735 served
Manheim Area Water & Sewer Aut
PA7360078 · 6,701 served
Kline Township Mun Authority
PA3540014 · 6,700 served
Harmony Boro Water Auth
PA5100042 · 6,669 served
Jersey Shore Area Jnt Wat Auth
PA4410156 · 6,600 served
Catasauqua Mun Water Works
PA3390044 · 6,598 served
Aqua Pa Fawn Lake Forest
PA2520037 · 6,533 served
Derry Boro Muni Auth
PA5650049 · 6,500 served
Monaca Boro Water Dept
PA5040039 · 6,500 served
Tyrone Boro Water Auth
PA4070021 · 6,500 served
Portage Boro Muni Auth
PA4110027 · 6,500 served
Veolia Newberry System
PA7670061 · 6,480 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