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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
351–375 of 812Bellwood Boro Auth
PA4070009 · 3,162 served
Martinsburg Muni Auth
PA4070030 · 3,160 served
East Taylor Muni Auth
PA4110043 · 3,152 served
Nanty Glo Water Auth
PA4110023 · 3,152 served
Aspinwall Boro Water Dept
PA5020003 · 3,151 served
Tower City Borough Authority
PA3540045 · 3,150 served
Quarryville Boro
PA7360112 · 3,150 served
Redbank Valley Mun Auth
PA6160010 · 3,150 served
Gallitzin Boro Water Auth
PA4110011 · 3,130 served
Va Healthcare System Heinz
PA5020031 · 3,112 served
Strasburg Muni Water Auth
PA7360118 · 3,100 served
Seven Fields Boro Water Dept
PA5100135 · 3,100 served
Eaton Sewer & Water Co
PA2660039 · 3,100 served
E Greenville Boro Water Dept
PA1460023 · 3,100 served
Midland Boro Muni Auth
PA5040038 · 3,100 served
Fort Indiantown Gap
PA7380044 · 3,100 served
Mawc Furnace Run
PA5650031 · 3,100 served
Pine Twp Water Distr System
PA6430061 · 3,082 served
Bedminster Mun Auth
PA1090104 · 3,042 served
Macungie Borough Authority
PA3390033 · 3,039 served
Bcwsa New Hope
PA1090130 · 3,017 served
Pawc Appalachian Dist
PA4180067 · 3,000 served
Mansfield University
PA2590812 · 3,000 served
Orwigsburg Municipal Water Wks
PA3540024 · 3,000 served
Walnutport Authority
PA3480032 · 3,000 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