WILMINGTON, DE · New Castle County
WILMINGTON WATER DEPARTMENT Water System
Consumer Confidence Report status
WILMINGTON WATER DEPARTMENT must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.
As of August 1, 2026, EPA's federal records show no open violations for WILMINGTON WATER DEPARTMENT.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Delaware’s official records. Always confirm current status with Delaware before making decisions based on this information.
System facts
- System ID (PWSID)
- DE0000663
- System type
- Community Water System
- Population served
- 107,976
- Service connections
- 37,915
- Ownership
- local government
- Water source
- surface water (rivers, lakes, or reservoirs)
WILMINGTON WATER DEPARTMENT is the second largest community water system in Delaware, serving 107,976 people from surface water.
As of August 1, 2026, its federal record holds 2 entries in 2015, all of which EPA lists as closed. Nothing has been added since 2015.
All 2 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Surface Water Treatment Rules.
Violation history
Monitoring, Source Water (LT2)
—Long Term 2 Enhanced Surface Water Treatment Rule
May 1, 2015 – September 29, 2015
ResolvedMonitoring, Source Water (LT2)
—Long Term 2 Enhanced Surface Water Treatment Rule
April 1, 2015 – September 29, 2015
Resolved
Resolved addressed and confirmed by the state
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| May 1, 2015 – September 29, 2015 | Monitoring, Source Water (LT2) | Long Term 2 Enhanced Surface Water Treatment Rule | — | Resolved |
| April 1, 2015 – September 29, 2015 | Monitoring, Source Water (LT2) | Long Term 2 Enhanced Surface Water Treatment Rule | — | Resolved |
Resolved addressed and confirmed by the state
Enforcement actions
- November 10, 2017Federal Compliance achieved1 linked violation
- September 29, 2015Federal Compliance achieved4 linked violations
Common questions
Is WILMINGTON WATER DEPARTMENT required to publish a Consumer Confidence Report?
- Yes. WILMINGTON WATER DEPARTMENT is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is WILMINGTON WATER DEPARTMENT’s next Consumer Confidence Report due?
- WILMINGTON WATER DEPARTMENT’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does WILMINGTON WATER DEPARTMENT have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for WILMINGTON WATER DEPARTMENT.
What is a Consumer Confidence Report?
- A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.
Contact
OH, CHRISTIANA
302-576-3017
WILMINGTON, DE 19801