Larimer County tap water
0 of 12 water systems serving Larimer County with full PFAS testing averaged above a 2024 federal PFAS level at one or more sampling points.
- 46 community water systems list this county as served; 12 serve 3,300+ people with full PFAS testing.
- 15 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 |
|---|---|---|---|---|
| Ft Collins City of | Surface water | 179,901 | No | 0 |
| Loveland City of | Surface water | 91,077 | No | 0 |
| Ft Collins Loveland Wd | Purchased surface water | 63,532 | No | 0 |
| East Larimer County Wd | Purchased surface water | 27,944 | No | 0 |
| Csu Main and West Housing Campus | Purchased surface water | 27,375 | No | 0 |
| Little Thompson Wd | Purchased surface water | 25,654 | No | 0 |
| Estes Park Town of | Surface water | 16,722 | No | 1 |
| Berthoud Town of | Surface water | 14,211 | No | 0 |
| Wellington Town of | Surface water | 11,720 | No | 2 |
| Northern Colorado WA | Purchased surface water | 4,675 | No | 0 |
| West Fort Collins Wd | Purchased surface water | 4,000 | No | 0 |
| Ymca Rockies Wind River | Purchased surface water | 3,730 | 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.