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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
426–450 of 812Aqua Pa Midway
PA2400104 · 2,450 served
Pawc Pine Ridge System
PA2520096 · 2,450 served
West Cocalico Twp Water Auth
PA7360141 · 2,430 served
Milford Water Authority
PA2520046 · 2,420 served
Sandycreek Twp Waterworks
PA6610042 · 2,417 served
Johnsonburg Municipal Auth
PA6240007 · 2,413 served
Aqua Pa Monroe Twp
PA4550009 · 2,400 served
Smethport Borough
PA6420023 · 2,400 served
Williamstown Boro Auth
PA7220037 · 2,390 served
Reynolds Water Company
PA6430057 · 2,370 served
Cambridge Springs Borough
PA6200004 · 2,363 served
Duncansville Muni Water Auth
PA4070012 · 2,350 served
Mercersburg Muni Water Auth
PA7280021 · 2,350 served
Newmanstown Water Auth
PA7380028 · 2,335 served
Aqua Pa Factoryville
PA2660036 · 2,323 served
Aqua Pa Crawford Div
PA6200014 · 2,300 served
Halifax Area Water & Sewer Aut
PA7220040 · 2,278 served
Jim Thorpe Borough Water West
PA3130044 · 2,274 served
Buhl Community Water Company
PA6430049 · 2,227 served
Oley Twp Muni Auth
PA3060053 · 2,204 served
Leesport Boro Water Auth
PA3060047 · 2,200 served
Blawnox Boro Water Dept
PA5020004 · 2,200 served
Borough of Dublin
PA1090107 · 2,200 served
Aleppo Twp Auth
PA5020070 · 2,200 served
Wallenpaupack Lake Estates
PA2640036 · 2,200 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