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Delaware Water Quality
79
Utilities in database
1.0M
Residents served
24%
On private wells
2
Key contaminants tracked
Drinking Water in Delaware
Delaware has 79 community water systems serving approximately 1.0 million residents. Primary water sources include groundwater. The most commonly reported contaminants include disinfection byproducts, nitrates. 24% of Delaware residents rely on private wells. DNREC holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Delaware
26–50 of 79Seaford Water Department
DE0000246 · 6,699 served
Bridgeville Water Department
DE0000559 · 6,000 served
Municipal Services Commission
DE0000634 · 5,549 served
East Ncc District
DE00A0334 · 5,538 served
Artesian Northern Sussex Regional
DE0020003 · 5,511 served
Camden Wyoming Sewer and Water Authority
DE0000563 · 5,000 served
North West Pump District
DE00A0347 · 4,149 served
Laurel Water Department
DE0000597 · 3,984 served
Harrington Water Department
DE0000126 · 3,562 served
Selbyville Water Department
DE0000654 · 3,502 served
Milton Water Department
DE0000629 · 3,200 served
Broadkiln Beach Water Company (tui)
DE0000238 · 3,171 served
Willow Grove Mill
DE0020122 · 3,090 served
Delaware City Water Department (awc)
DE0000566 · 2,610 served
Delmar Utility Comm (tn of Delmar)
DE0000567 · 2,027 served
Delaware Correctional Center
DE0000011 · 2,000 served
Swann Keys
DE0000465 · 1,764 served
Felton Water Department
DE0000580 · 1,591 served
Rehoboth Bay Community
DE0000645 · 1,575 served
Bridgeville Pump District
DE0000949 · 1,542 served
Burtonwood
DE00A0740 · 1,503 served
Mallard Lakes
DE00A0169 · 1,500 served
Parkside
DE0020123 · 1,467 served
Angola Beach Estates
DE0000840 · 1,400 served
Town of Blades
DE0000865 · 1,200 served
Key Contaminant Concerns in Delaware
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.
Delaware Water FAQs
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Data source: Utility data from EPA SDWIS. 79 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-23