B61/100
WILMINGTON WATER DEPARTMENT — Water Quality Report 2026
Serving 107,976 people · Delaware
Water Source
Surface Water
County
—
System ID
DE0000663
Violations
12
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFOA | 0.010 µg/L | 0.004 µg/L | Over Limit |
chlorate | 500.00 µg/L | — | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: August 1, 2023 – August 31, 2023Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About WILMINGTON WATER DEPARTMENT
Is WILMINGTON WATER DEPARTMENT water safe to drink?
WILMINGTON WATER DEPARTMENT water receives a grade of B (61/100), which is considered good. Out of 76 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has WILMINGTON WATER DEPARTMENT detected?
76 contaminants were tested in WILMINGTON WATER DEPARTMENT's water. Notable contaminants include PFOA, chlorate. 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does WILMINGTON WATER DEPARTMENT have any EPA violations?
Yes, WILMINGTON WATER DEPARTMENT has 12 EPA violation(s) on record, with the most recent in 2023. Violation types include MON, TT, Other. 4 are health-based violations.
How many people does WILMINGTON WATER DEPARTMENT serve?
WILMINGTON WATER DEPARTMENT serves approximately 107,976 people, Delaware. The system provides water to 1 community: Wilmington.
What type of water does WILMINGTON WATER DEPARTMENT provide?
WILMINGTON WATER DEPARTMENT sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is DE0000663.
How does WILMINGTON WATER DEPARTMENT compare to other utilities in Delaware?
WILMINGTON WATER DEPARTMENT scores 61/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Delaware state page for a full comparison of water systems.