Delaware tap water
11 of 34 Delaware water systems with full PFAS testing (32%) averaged above a 2024 federal PFAS level at one or more sampling points.
- 204 active community water systems in the EPA file; 32 serve 3,300+ people and have a full PFAS set.
- 12 systems had at least one health-based violation since 2021-10-26.
- 1 systems report a lead 90th percentile above 15 ppb (some results are old; check each system page).
Largest systems
| System | People served | PFAS above a 2024 level? | Health-based violations since 2021-10-26 |
|---|---|---|---|
| Artesian Water Company | 231,114 | Yes, at one or more sampling points | 0 |
| Wilmington Water department | 107,976 | Yes, at one or more sampling points | 0 |
| Veolia Water Delaware, Inc | 100,495 | Yes, at one or more sampling points | 0 |
| Rehoboth Pump District (Tui) | 81,417 | No | 0 |
| Bethany Bay Pump District | 52,684 | Yes, at one or more sampling points | 0 |
| Newark Water department | 40,000 | Yes, at one or more sampling points | 0 |
| Dover Water department | 39,491 | No | 0 |
| Dewey Beach Water department | 31,000 | Yes, at one or more sampling points | 0 |
Counties
All 5 utilities with a page in Delaware
- Artesian Water Company 231,114
- Bethany Bay Pump District 52,684
- Rehoboth Pump District (Tui) 81,417
- Veolia Water Delaware, Inc 100,495
- Wilmington Water department 107,976
Why not "the state's water quality"? You drink from one utility, not a state. Rollups count systems, not people, so one large utility counts the same as a small one. Use the system pages for your actual water.
Not medical or legal advice. UCMR 5 results are screening data, not compliance determinations.
Sources and freshness
Public-water-system facts, violations and lead/copper results: EPA ECHO SDWA download (SDWIS snapshot 2026-10-13). PFAS and lithium results: EPA UCMR 5 final data (sampling 2023–2025). Both are U.S. government works, downloaded 2026-10-26. Numbers are computed by the published method; the same fields are in the open data files.