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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
1–25 of 79Artesian Water Company
DE0000552 · 231,114 served
Wilmington Water Department
DE0000663 · 107,976 served
Veolia Water Delaware, Inc
DE0000564 · 100,495 served
Rehoboth Pump District (tui)
DE0000991 · 81,417 served
Bethany Bay Pump District
DE0000221 · 51,000 served
Newark Water Department
DE0000630 · 40,000 served
Dover Water Department
DE0000571 · 39,491 served
Dewey Beach Water Department
DE0000825 · 31,000 served
Rehoboth Beach Water Department
DE0000723 · 25,000 served
Artesian Southern Sussex Regional
DE00A0323 · 18,215 served
Middletown Water Department
DE0000614 · 17,700 served
Camden Pump District
DE0000124 · 17,208 served
Garrison Lake Pump District
DE0000004 · 17,148 served
Sussex Shores Water Company
DE0000557 · 12,450 served
Bethany Beach Water Department
DE0000556 · 12,000 served
Smyrna Water Department
DE0000657 · 11,813 served
Long Neck Water Company
DE0000625 · 11,000 served
Dover Air Force Base
DE0000579 · 11,000 served
Milford Water Department
DE0000616 · 9,800 served
Church Creek (awc)
DE00A0428 · 9,654 served
Lewes Board of Public Works
DE0000602 · 9,627 served
Millsboro Water Department
DE0000622 · 8,568 served
Bayside Pump District (tui)
DE00A0837 · 8,400 served
Georgetown Water Department
DE0000592 · 7,259 served
Artesian Northern Kent Regional
DE00A0673 · 7,014 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