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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
526–550 of 812Bedford Twp Muni Auth
PA4050037 · 1,626 served
Jennerstown Muni Auth
PA4560038 · 1,625 served
Linesville Municipal Authority
PA6200027 · 1,600 served
Aqua Pa Honeybrook
PA1150195 · 1,600 served
Middleburg Municipal Authority
PA4550016 · 1,600 served
Township of Springdale
PA5020021 · 1,600 served
Barkeyville Mun Authority
PA6610036 · 1,600 served
Aqua Pa Lake Latonka Wtp
PA6430059 · 1,600 served
Pawc Mid Monroe
PA2450119 · 1,580 served
Brady Twp Water Association
PA6170036 · 1,570 served
Upper Halfmoon Water
PA4140109 · 1,500 served
Imperial Point Water Service
PA6250046 · 1,500 served
Aqua Pa Hamilton Water Co
PA2450044 · 1,500 served
Federal Corr Institute Loretto
PA4110067 · 1,500 served
Mt Morris Water & Sewage Auth
PA5300015 · 1,500 served
Hawthorn Redbank Redbank Ma
PA6160026 · 1,500 served
Saegertown Borough
PA6200043 · 1,500 served
Vernon Twp Water Authority
PA6200072 · 1,500 served
Worthington West Franklin Jma
PA5030027 · 1,500 served
Sykesville Borough
PA6330013 · 1,500 served
Paw Nittany
PA4140081 · 1,499 served
Green Acres Mhc
PA3390090 · 1,475 served
Oakdale Boro Water Dept
PA5020067 · 1,459 served
Richlandtown Water Department
PA1090057 · 1,450 served
Aqua Pa Mountainhome System
PA2450039 · 1,450 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