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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
551–575 of 812Walker Twp Muni Auth
PA4310038 · 1,450 served
Falls Creek Boro Mun Auth
PA6330007 · 1,440 served
Borough of Atglen
PA1150109 · 1,406 served
Delta Boro Water Sys
PA7670070 · 1,400 served
Freedom Twp Water & Sewer
PA4070034 · 1,400 served
Grampian Boro Penn Twp Ma
PA6170021 · 1,400 served
Lincoln Twp Muni Auth
PA4560031 · 1,400 served
Lca Arcadia West Division
PA3391001 · 1,392 served
Lilly Borough Water Authority
PA4110046 · 1,388 served
Aqua Pa Sand Springs
PA2400140 · 1,383 served
Knox Water Works
PA6160005 · 1,380 served
Somerset Twp M a Friedens
PA4560057 · 1,374 served
Troy Water Deptartment
PA2080020 · 1,362 served
Rawa North Heidelberg
PA3060115 · 1,350 served
Benton Municipal Water Auth
PA4190014 · 1,333 served
Windsor Boro Water Auth
PA7670065 · 1,332 served
Aqua Pa Tanglewood Lakes
PA2520065 · 1,321 served
Westfield Borough Waterworks
PA2590043 · 1,300 served
Nemacolin Woodlands
PA5260045 · 1,300 served
Village of Neshaminy Falls
PA1460077 · 1,300 served
Roulette Twp Water Authority
PA6530007 · 1,300 served
Swt Allentown Cons System
PA3390087 · 1,300 served
Village of Buckingham Springs
PA1090133 · 1,295 served
Terre Hill Borough
PA7360119 · 1,295 served
Can Do Corporate Center
PA2401021 · 1,291 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