PFHxS in Treasure Valley drinking water
17 of 132 systems that tested for it in the last 36 months detected it; 17 are above the limit, elevated, or an aesthetic issue. PFHxS is a PFAS compound. Some results are from EPA UCMR monitoring, not a claim it is in every tap. Certified filters are in the list.
| System | County | 36 mo max | Latest | Status | Last sample |
|---|---|---|---|---|---|
| Garden City Water and Sewer System | Ada | 25.4ppt | ND | Above limit | 2026-06-16 |
| Anderson Circle Water Corp. | Ada | 19.4ppt | 19.4ppt | Above limit | 2026-04-23 |
| Mountain Home Air Force Base | Elmore | 10.0ppt | 10.0ppt | Elevated | 2023-10-25 |
| Krizview Park | Ada | 8.4ppt | 8.4ppt | Elevated | 2026-07-14 |
| Veolia Water Idaho | Ada | 7.2ppt | 2.9ppt | Elevated | 2026-03-10 |
| Linda Vista Mobile Home Park | Ada | 6.3ppt | 5.3ppt | Elevated | 2026-07-14 |
| Capitol Water Corp. | Ada | 5.1ppt | ND | Elevated | 2024-10-08 |
| Eagle Point Community | Ada | 4.5ppt | 4.5ppt | Elevated | 2026-07-16 |
| Meridian Water Department | Ada | 4.0ppt | ND | Elevated | 2026-06-02 |
| Paradise Estates Water Corp. | Ada | 3.6ppt | ND | Elevated | 2026-04-16 |
| Trinity Estates Water Users Association | Elmore | 3.3ppt | 3.3ppt | Elevated | 2025-04-01 |
| Amy Trailer Park | Ada | 3.0ppt | 3.0ppt | Elevated | 2026-03-02 |
| Sunnyridge I Subdivision | Canyon | 2.9ppt | 2.9ppt | Elevated | 2026-04-06 |
| Sawtooth Estates Water Users | Elmore | 2.7ppt | 1.4ppt | Elevated | 2025-04-01 |
| Rustic Acres Mobile Home Park | Ada | 2.6ppt | 2.6ppt | Elevated | 2026-04-16 |
| Flying H Trailer Ranch | Ada | 2.4ppt | 2.3ppt | Elevated | 2026-07-14 |
| Canyon Creek Mobile Home Park | Elmore | 2.1ppt | ND | Elevated | 2026-05-05 |
Limits
- Federal limit (MCL)
- 0.01 ug/L (10.0ppt)
- Health goal (MCLG)
- 10.0ppt
EPA set an MCL of 10 ppt for PFHxS in 2024 based on liver, thyroid and immune effects.Agency language as recorded in the contaminant reference.
Removal methods in the reference list: reverse osmosis, granular activated carbon, anion exchange. A method name is not a product certification.
By city: PFHxS in Boise City drinking water, PFHxS in Garden City drinking water, PFHxS in Mountain Home drinking water, PFHxS in Mountain Home AFB drinking water, PFHxS in Meridian drinking water, PFHxS in Eagle drinking water.
Not enough groundwater samples in the region to estimate PFHxS in private wells. A lab test is the only way to know.
Numbers are the system's samples at its taps and wells, not yours. Lead and copper are 90th percentiles from sampled homes. Well pages are nearby-sample estimates. Health text restates EPA and DEQ. Methodology.