Weld County tap water
0 of 15 water systems serving Weld County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 58 community water systems list this county as served; 15 serve 3,300+ people with full PFAS testing.
- 10 had a health-based violation since 2021-10-26.
Largest systems serving this county
| System | Source | People served (whole system) | PFAS above a 2024 level? | Violations since 2021-10-26 |
|---|---|---|---|---|
| Greeley City of | Surface water | 132,310 | No | 0 |
| Firestone Town of | Purchased surface water | 27,798 | No | 0 |
| Johnstown Town of | Surface water | 27,295 | No | 0 |
| Windsor Town of | Purchased surface water | 23,500 | No | 0 |
| Evans City of | Purchased surface water | 19,369 | No | 0 |
| Frederick Town of | Purchased surface water | 17,173 | No | 0 |
| North Weld County Wd | Purchased surface water | 15,890 | No | 0 |
| Ft Lupton City of | Surface water | 12,099 | No | 3 |
| Severance Town of | Purchased surface water | 11,733 | No | 0 |
| Milliken Town of | Purchased surface water | 9,200 | No | 0 |
| Central Weld Cnty Wd | Purchased surface water | 7,662 | No | 0 |
| Eaton Town of | Purchased surface water | 7,328 | No | 1 |
Which one is yours? A county usually has several utilities. Your bill or your utility's annual water-quality report names yours. Population is for the whole system, which can cross county lines.
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.