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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
51–75 of 79Pinewood Acres
DE0000547 · 1,200 served
Wild Quail Pump District
DE00A0159 · 1,017 served
Greenwood Water Department
DE0000558 · 973 served
Frederica Water Department
DE0000587 · 950 served
South East Pump District
DE00A0376 · 936 served
Dagsboro Water Dept
DE00A0799 · 934 served
Laurel Village Mhc
DE0000265 · 918 served
Dove Run
DE0020124 · 909 served
Baywood Greens
DE00A0425 · 909 served
Frederica Pump District
DE0020007 · 861 served
Villagebrook
DE0020141 · 847 served
Slaughter Beach Pws
DE0002618 · 846 served
Holly Hill Estates
DE0000939 · 831 served
Clearbrooke Estates Pump District
DE00A0326 · 768 served
Stockley Center
DE0000276 · 749 served
Winterthur
DE0000503 · 687 served
Hunters Run
DE0020139 · 683 served
Seaglass at Rehoboth Beach
DE0020117 · 674 served
Home Town Village of Cool Branch
DE00A0377 · 654 served
Grants Way Pump District (tui)
DE00A0522 · 639 served
Cape Windsor Community Association Inc
DE0000439 · 600 served
Cedar Village Llc
DE0000254 · 600 served
Southwood Acres Pump District
DE0000613 · 591 served
Bridgeville Mall (tui)
DE0000155 · 550 served
Tall Pines Resort Community Sys1
DE0001605 · 538 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