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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
26–50 of 812Altoona Water Authority
PA4070023 · 62,500 served
Hampton Shaler Water Authority
PA5020019 · 61,949 served
Aqua Pa Bensalem
PA1090078 · 59,001 served
Paw Ceasetown
PA2409002 · 58,467 served
Lebanon Water Auth
PA7380010 · 57,000 served
Paw Nesbitt
PA2409010 · 52,640 served
Bcwsa Main Lower South
PA1090079 · 52,621 served
Paw Watres
PA2409011 · 52,002 served
Williamsport Mun Water Auth
PA4410173 · 51,000 served
Pa Amer Water Co
PA7220017 · 50,200 served
Pa American Royersford
PA1150166 · 49,508 served
Greater Johnstown Wa Riverside
PA4110034 · 49,500 served
Beaver Falls Muni Auth
PA5040012 · 49,500 served
Aqua Pa West Chester
PA1150098 · 48,600 served
Monroeville Municipal Auth
PA5020027 · 48,500 served
Aqua Pa Shenango Valley Wtp
PA6430054 · 48,000 served
New Kensington Muni Auth
PA5650070 · 47,800 served
Lca Wlsa Central Division
PA3390073 · 47,693 served
Veolia Mechanicsburg
PA7210028 · 45,013 served
Hca Hazleton Division
PA2408001 · 45,000 served
Pa American Water Co Butler
PA5100012 · 43,286 served
Pa Amer Water Co New Castle
PA6370034 · 43,279 served
Aqua Pa Roaring Creek Division
PA4490024 · 43,000 served
Cranberry Twp Wtp
PA5100094 · 42,000 served
Hanover Muni Water Works
PA7670076 · 40,900 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.
Pennsylvania Water FAQs
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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