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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
276–300 of 812Upper Hanover Water Authority
PA1460036 · 4,600 served
North Sewickley Mun Water Auth
PA5040010 · 4,578 served
Pike Twp Municipal Authority
PA6170013 · 4,500 served
Fairview Twp Water District 1
PA6250087 · 4,500 served
Northern Cambria Muni Water
PA4110003 · 4,500 served
New Wilmington Boro Water Dept
PA6370035 · 4,500 served
Seneca & Cranberry Mall Dist
PA6610031 · 4,500 served
Milford Twp Water Authority
PA1090125 · 4,497 served
New Freedom Boro Water Auth
PA7670082 · 4,464 served
Slatington Borough Water Sys
PA3390039 · 4,450 served
Mifflintown Muni Auth
PA4340008 · 4,450 served
Southwestern Cambria Cnty Auth
PA4110041 · 4,400 served
Franklin System York Water
PA7280045 · 4,400 served
Brockway Boro Municipal Auth
PA6330002 · 4,384 served
West Earl Water Authority
PA7360143 · 4,327 served
Aqua Pa Jenks Twp Wtp
PA6270008 · 4,320 served
West Reading Boro Water
PA3060078 · 4,300 served
Penn Estates Utilities Incorp
PA2450065 · 4,300 served
Union City Municipal Authority
PA6250064 · 4,295 served
New Sewickley Twp Muni Auth
PA5040085 · 4,276 served
Caernarvon Twp Auth
PA3060052 · 4,245 served
Jackson Twp Water Auth
PA4110021 · 4,236 served
Pa Amer Water Co Susquehanna
PA2580024 · 4,230 served
Fleetwood Boro Water System
PA3060029 · 4,218 served
Akron Borough
PA7360128 · 4,200 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