WILMINGTON WATER DEPARTMENT
Delaware — Community Water System — PWSID: DE0000663
System Information
| PWSID | DE0000663 |
| System Name | WILMINGTON WATER DEPARTMENT |
| System Type | Community Water System |
| Water Source | Surface Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 03 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 10, 1979 |
| Last Reported | Dec 3, 2025 |
Location & Contact
| State | Delaware |
| City | WILMINGTON |
| ZIP Code | 19801 |
| Address | Water Work Center |
| Organization | OH, CHRISTIANA |
| Phone | 302-576-3017 |
Population & Service
| Population Served | 107,976 |
| Service Connections | 37,915 |
Drinking Water Violations (17)
This water system has 17 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Aug 1, 2023 | Aug 31, 2023 | Revised Total Coliform Rule | MON | No | No | — | — | — | Resolved | Aug 31, 2023 | Revised Total Coliform Rule |
| Aug 1, 2023 | Aug 31, 2023 | Revised Total Coliform Rule | MON | No | No | — | — | — | Resolved | Aug 31, 2023 | Revised Total Coliform Rule |
| Aug 1, 2023 | Aug 31, 2023 | Revised Total Coliform Rule | MON | No | No | — | — | — | Resolved | Aug 31, 2023 | Revised Total Coliform Rule |
| Oct 1, 2017 | — | Long Term 2 Enhanced Surface Water Treatment Rule | TT | Yes | No | — | — | — | Resolved | Nov 10, 2017 | Long Term 2 Enhanced Surface Water Treatment Rule |
| Oct 1, 2017 | — | Long Term 2 Enhanced Surface Water Treatment Rule | TT | Yes | No | — | — | — | Resolved | Nov 10, 2017 | Long Term 2 Enhanced Surface Water Treatment Rule |
| May 1, 2015 | May 31, 2015 | Cryptosporidium | MR | No | Yes | — | — | — | Resolved | May 31, 2015 | Long Term 2 Enhanced Surface Water Treatment Rule |
| May 1, 2015 | — | Long Term 2 Enhanced Surface Water Treatment Rule | MR | No | No | — | — | — | Resolved | Sep 29, 2015 | Long Term 2 Enhanced Surface Water Treatment Rule |
| May 1, 2015 | — | Long Term 2 Enhanced Surface Water Treatment Rule | MR | No | No | — | — | — | Resolved | Sep 29, 2015 | Long Term 2 Enhanced Surface Water Treatment Rule |
| May 1, 2015 | May 31, 2015 | Cryptosporidium | MR | No | Yes | — | — | — | Resolved | May 31, 2015 | Long Term 2 Enhanced Surface Water Treatment Rule |
| Apr 1, 2015 | Apr 30, 2015 | Cryptosporidium | MR | No | No | — | — | — | Resolved | Apr 30, 2015 | Long Term 2 Enhanced Surface Water Treatment Rule |
| Apr 1, 2015 | Apr 30, 2015 | Cryptosporidium | MR | No | No | — | — | — | Resolved | Apr 30, 2015 | Long Term 2 Enhanced Surface Water Treatment Rule |
| Apr 1, 2015 | — | Long Term 2 Enhanced Surface Water Treatment Rule | MR | No | No | — | — | — | Resolved | Sep 29, 2015 | Long Term 2 Enhanced Surface Water Treatment Rule |
| Apr 1, 2015 | — | Long Term 2 Enhanced Surface Water Treatment Rule | MR | No | No | — | — | — | Resolved | Sep 29, 2015 | Long Term 2 Enhanced Surface Water Treatment Rule |
| Jul 1, 2013 | Jul 31, 2013 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 2013 | Total Coliform Rule |
| Jul 1, 2013 | Jul 31, 2013 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 2013 | Total Coliform Rule |
| Jul 1, 2013 | Jul 31, 2013 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 2013 | Total Coliform Rule |
| May 1, 2004 | May 31, 2004 | Surface Water Treatment Rule | TT | Yes | No | — | — | — | Resolved | May 31, 2004 | Surface Water Treatment Rule |
About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.