Delaware tap water quality
204 active community water systems.
Largest water systems
Most issues (systems serving 10,000+)
C
Artesian Water Company
Serves 231,114 people · Surface water · Full report →
No health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOA, PFOS; Lead 90th percentile below the action level (2023).
C
Newark Water Department
Serves 40,000 people · Surface water · Full report →
No health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOA, PFOS; Lead 90th percentile below the action level (2024).
C
Smyrna Water Department
Serves 11,813 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOA, PFOS; Lead 90th percentile below the action level (2024).
B
Wilmington Water Department
Serves 107,976 people · Surface water · Full report →
No health-based violations in the last 5 years; 1 monitoring/reporting violation; PFOA/PFOS average above the 4 ppt federal limit: PFOA; Lead 90th percentile below the action level (2023).
B
Veolia Water Delaware, Inc
Serves 100,495 people · Surface water · Full report →
No health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOA; Lead 90th percentile below the action level (2023).
B
Bethany Bay Pump District
Serves 52,684 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOS; Lead 90th percentile below the action level (2023).
B
Dewey Beach Water Department
Serves 31,000 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOA; Lead 90th percentile below the action level (2023).
B
Rehoboth Beach Water Department
Serves 25,000 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOA; Lead 90th percentile below the action level (2024).
B
Artesian Southern Sussex Regional
Serves 20,145 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFOA/PFOS average above the 4 ppt federal limit: PFOS; Lead 90th percentile below the action level (2025).
A
Rehoboth Pump District (Tui)
Serves 81,417 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
A
Dover Water Department
Serves 39,491 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
A
Middletown Water Department
Serves 17,700 people · Surface water · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
A
Camden Pump District
Serves 17,208 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2024).
A
Garrison Lake Pump District
Serves 17,148 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A
Sussex Shores Water Company
Serves 12,450 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A
Bethany Beach Water Department
Serves 12,000 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2025).
A
Long Neck Water Company
Serves 11,000 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
A
Dover Air Force Base
Serves 11,000 people · Groundwater · Full report →
No health-based violations in the last 5 years; PFAS tested (UCMR 5), none above federal limits; Lead 90th percentile below the action level (2023).
Cities
BearBethany BeachBethelBowers BeachBridgevilleCamden WyomingCamden-WyomingCheswoldClaymontClaytonDagsboroDelaware CityDelmarDewey BeachDoverDover AFBEllendaleFeltonFenwick IslandFrankfordFredericaGeorgetownGreenwoodHarbesonHarringtonHartlyHockessinHoustonKentonKirkwoodLaurelLebanonLewesLincolnLittle CreekMagnoliaMarydelMiddletownMilfordMillsboroMillvilleMiltonMontchaninNassauNew CastleNewarkOcean ViewOdessaPort PennRehoboth BeachRising SunRocklandSaint GeorgesSeafordSelbyvilleSlaughter BeachSmyrnaTownsendViolaWilmingtonWinterthur