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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
376–400 of 812Pawc Appalachian Dist
PA4180067 · 3,000 served
Ford City Muni Water Works
PA5030005 · 2,991 served
Northwestern Lancaster Co Auth
PA7360164 · 2,968 served
Pawc Wild Acres
PA2520034 · 2,943 served
Lake City Boro Munic Water
PA6250056 · 2,935 served
Lca North Whitehall Division
PA3390055 · 2,910 served
Reynoldsville Water Auth
PA6330011 · 2,908 served
North Coventry Water System
PA1150220 · 2,907 served
Boswell Boro Muni Auth
PA4560030 · 2,900 served
Sci Dallas
PA2400090 · 2,900 served
Muncy Borough Water Company
PA4410165 · 2,900 served
Muni Auth of Boro of Matamoras
PA2520044 · 2,900 served
Honey Brook Boro Water
PA1150127 · 2,892 served
Summit Hill Water Authority
PA3130013 · 2,890 served
West Grove Borough
PA1150105 · 2,873 served
Jim Thorpe Borough Water East
PA3130043 · 2,853 served
Pa Amer Water Co Fallbrook
PA2359006 · 2,851 served
State Corr Inst Benner Twp
PA4140098 · 2,850 served
Nesquehoning Boro Water Auth
PA3130026 · 2,850 served
Warwick Twp Rothsville System
PA7360120 · 2,846 served
Hughesville Borough Water Auth
PA4410178 · 2,800 served
National Pike Water Auth
PA5260048 · 2,800 served
Ohioville Boro Muni Auth
PA5040044 · 2,750 served
Milesburg Borough Water Auth
PA4140083 · 2,750 served
Youngstown Boro Muni Auth
PA5650081 · 2,730 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