Idaho tap water
2 of 60 Idaho water systems with full PFAS testing (3%) averaged above a 2024 federal PFAS level at one or more sampling points.
- 762 active community water systems in the EPA file; 52 serve 3,300+ people and have a full PFAS set.
- 166 systems had at least one health-based violation since 2021-10-26.
- 0 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 |
|---|---|---|---|
| Veolia Water Idaho | 264,978 | No | 0 |
| Meridian Water dept | 152,070 | No | 0 |
| Nampa City of | 100,200 | No | 0 |
| Caldwell City of | 78,740 | No | 0 |
| Idaho Falls City of | 69,450 | No | 0 |
| Pocatello City of | 58,231 | No | 0 |
| Twin Falls City of | 56,121 | No | 0 |
| Coeur D Alene City of | 54,115 | No | 0 |
All 8 utilities with a page in Idaho
- Caldwell City of 78,740
- Coeur D Alene City of 54,115
- Idaho Falls City of 69,450
- Meridian Water dept 152,070
- Nampa City of 100,200
- Pocatello City of 58,231
- Twin Falls City of 56,121
- Veolia Water Idaho 264,978
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.