Delaware drinking water quality
Delaware has 455 active public water systems serving 1.1 million people. 97 of them, 21%, had at least one EPA violation in the past three years, 55 have an unresolved violation today, and 0 are designated serious violators by the EPA.
Active systems
455
in 3 counties
People served
1.1M
204 community systems serve 1M
Violations, past 3 years
97
21% of active systems
Serious violators
0
2 systems carry a health flag
Largest counties
All 3 counties| County | People served | Systems | With violations |
|---|---|---|---|
| New Castle | 541,173 | 77 | 9 |
| Sussex | 386,364 | 245 | 53 |
| Kent | 162,638 | 133 | 35 |
Largest community water systems
All 455 systems| System | Serves | Status |
|---|---|---|
| Artesian Water Company New Castle County |
231,114 | |
| Wilmington Water Department New Castle County |
107,976 | |
| Veolia Water Delaware, INC New Castle County |
100,495 | |
| Rehoboth Pump District (tui) Sussex County |
81,417 | |
| Bethany Bay Pump District Sussex County |
52,684 | |
| Newark Water Department New Castle County |
40,000 | |
| Dover Water Department Kent County |
39,491 | |
| Dewey Beach Water Department Sussex County |
31,000 | |
| Rehoboth Beach Water Department Sussex County |
25,000 | |
| Artesian Southern Sussex Regional Sussex County |
20,145 |
About the Delaware data
Retrieved from EPA ECHO on Oct 11, 2026.