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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
51–75 of 812Southwestern Pa Water Auth
PA5300017 · 40,200 served
Northampton Boro Muni Auth
PA3480057 · 40,000 served
Oakmont Water Authority
PA5020036 · 39,901 served
Newtown Artesian Water Co
PA1090043 · 38,500 served
Moon Twp Muni Auth
PA5020011 · 38,000 served
Penn State Univ
PA4140095 · 37,000 served
Pa American Coatesville
PA1150106 · 36,960 served
Northampton Bucks Co Mun Auth
PA1090089 · 36,750 served
Warminster Municipal Authority
PA1090069 · 36,000 served
Pottstown Borough Water Auth
PA1460037 · 36,000 served
Aqua Pa Uwchlan
PA1150035 · 35,518 served
North Fayette Cnty Muni Auth
PA5260019 · 35,409 served
Pa American Water Co Yardley
PA1090074 · 33,171 served
West Cnty Muni Auth-mckeesport
PA5020025 · 32,644 served
Schuylkill Co Mun Auth
PA3540038 · 31,850 served
Chambersburg Boro Water Sys
PA7280005 · 31,048 served
Pa American White Deer
PA4490023 · 30,209 served
Brodhead Creek Reg Water Auth
PA2450034 · 30,000 served
Latrobe Muni Auth
PA5650060 · 30,000 served
Mifflin Cnty Muni Auth
PA4440010 · 29,432 served
Veolia Water Pa Inc Bloomsburg
PA4190008 · 29,382 served
Aqua Pa Bristol
PA1090001 · 28,727 served
Paw Penn District
PA3060069 · 28,508 served
Guilford Water Auth
PA7280038 · 28,135 served
Plum Boro Muni Auth
PA5020041 · 27,500 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