HFPO-DA (GenX) 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. HFPO-DA (GenX) 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 |
|---|---|---|---|---|---|
| Veolia Water Idaho | Ada | 6.8ppt | ND | Elevated | 2026-03-10 |
| Anderson Circle Water Corp. | Ada | 6.3ppt | 6.3ppt | Elevated | 2026-04-23 |
| Garden City Water and Sewer System | Ada | 6.3ppt | ND | Elevated | 2026-06-16 |
| Amy Trailer Park | Ada | 6.1ppt | 6.1ppt | Elevated | 2026-03-02 |
| Sawtooth Estates Water Users | Elmore | 6.0ppt | 3.9ppt | Elevated | 2025-04-01 |
| Trinity Estates Water Users Association | Elmore | 5.9ppt | 5.2ppt | Elevated | 2025-04-01 |
| Canyon Creek Mobile Home Park | Elmore | 5.2ppt | 5.2ppt | Elevated | 2026-05-05 |
| Linda Vista Mobile Home Park | Ada | 4.9ppt | 4.9ppt | Elevated | 2026-07-14 |
| Riley Trailer Park | Ada | 3.5ppt | 3.5ppt | Elevated | 2026-04-07 |
| Paradise Estates Water Corp. | Ada | 3.5ppt | ND | Elevated | 2026-04-16 |
| Sunnyridge I Subdivision | Canyon | 3.3ppt | 3.3ppt | Elevated | 2026-04-06 |
| Eagle Point Community | Ada | 2.7ppt | 2.7ppt | Elevated | 2026-07-16 |
| Valley View Water | Canyon | 2.4ppt | 2.4ppt | Elevated | 2026-04-06 |
| Belle Aire Acres 2 | Canyon | 2.3ppt | 2.3ppt | Elevated | 2026-02-23 |
| Rustic Acres Mobile Home Park | Ada | 2.2ppt | 2.2ppt | Elevated | 2026-04-16 |
| Krizview Park | Ada | 2.1ppt | 2.1ppt | Elevated | 2026-07-14 |
| Meridian Water Department | Ada | 1.3ppt | ND | Elevated | 2026-06-02 |
Limits
- Federal limit (MCL)
- 0.01 ug/L (10.0ppt)
- Health goal (MCLG)
- 10.0ppt
EPA set an MCL of 10 ppt for HFPO-DA in 2024.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: HFPO-DA (GenX) in Boise City drinking water, HFPO-DA (GenX) in Garden City drinking water, HFPO-DA (GenX) in Meridian drinking water, HFPO-DA (GenX) in Eagle drinking water, HFPO-DA (GenX) in Nampa drinking water.
Not enough groundwater samples in the region to estimate HFPO-DA (GenX) 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.