Wilmington Water Department water system
PWSID DE0000663 · Wilmington, DE. EPA's record of drinking water violations for this public water system, as retrieved October 14, 2026.
How to read this. This page copies EPA's record for one public water system from the Safe Drinking Water Information System (SDWIS), without interpretation. A violation is recorded when a water system breaks a federal or state drinking water rule. A health-based violation means a contaminant went over a federal limit or a required treatment step was not met. Most other violations are tests or reports that were missed or late. A returned to compliance date means the state recorded the violation as resolved. A past violation does not describe the water today. EPA updates this data about every three months, so the newest violations may not appear yet. Delaware's Office of Drinking Water regulates this system; if this page and the state's records differ, the state is right and we fix this page. We rank no water system and draw no conclusions.
System facts
| Name in EPA records | WILMINGTON WATER DEPARTMENT |
|---|---|
| Public water system ID (PWSID) | DE0000663 |
| System type | Community water system |
| Status | Active |
| County served | New Castle |
| City or town served | Wilmington |
| People served (EPA figure) | 107,976 |
| Primary water source | Surface water |
Source: EPA SDWIS water system record and area served, Delaware systems, retrieved October 14, 2026. Full EPA report: EPA ECHO report for DE0000663.
Violations on record
EPA SDWIS lists 5 violations for this system: 1 health-based and 0 with no return-to-compliance date recorded. Newest first.
| Compliance period began | Period ended | Rule or contaminant (EPA wording) | Category | Health-based | Returned to compliance |
|---|---|---|---|---|---|
| August 1, 2023 | August 31, 2023 | Revised Total Coliform Rule | Monitoring (MON) | No | October 9, 2023 |
| October 1, 2017 | Not listed | Long Term 2 Enhanced Surface Water Treatment Rule | Treatment technique (TT) | Yes | November 10, 2017 |
| July 1, 2015 | Not listed | Consumer Confidence Rule | Other | No | July 6, 2015 |
| May 1, 2015 | Not listed | Long Term 2 Enhanced Surface Water Treatment Rule | Monitoring and reporting (MR) | No | September 29, 2015 |
| April 1, 2015 | Not listed | Long Term 2 Enhanced Surface Water Treatment Rule | Monitoring and reporting (MR) | No | September 29, 2015 |
Source: EPA SDWIS violation records, Delaware systems, retrieved October 14, 2026. Rule and contaminant names: EPA ECHO contaminant list. A blank end date or return-to-compliance date means EPA's record has none. For enforcement actions and the latest status, see the EPA ECHO report for this system.
Get this system's water quality report
Every community water system must give its customers a yearly water quality report, called a Consumer Confidence Report (CCR). It lists the contaminants found in the water and the federal limit for each. To get it, ask your water supplier (the contact is on your water bill) or check its website. EPA: how to find and read your CCR.
Delaware's Office of Drinking Water (Division of Public Health) regulates public water systems in the state and can answer questions about this system. The state also publishes system records in Drinking Water Watch.