ZIP Code 95482
High RiskPFAS above EPA limits detected
2 compounds exceed EPA Maximum Contaminant Levels in water serving this ZIP code. Standard pitcher filters like Brita do not remove PFAS. See filter recommendations below.
9
PFAS Detected
2
Above EPA Limits
1
Water System
185%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 185% of limit
Detected: 7.40 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 173% of limit
Detected: 6.90 ppt
UKIAH, CITY OF
CA2310003 High RiskWater Type
Groundwater
PFAS Detected
9
Above MCL
2
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 7.40ppt | 185% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 6.90ppt | 173% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 7.30ppt | 73% of limit
| 10 ppt | Below limit |
6:2 FTS 6:2 Fluorotelomer sulfonic acid | 17.80ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 9.20ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 6.20ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 5.10ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 4.40ppt | No federal limit | — | Unregulated |
Show 1 more compound detected at low levels
| PFHpAPerfluoroheptanoic acid | 3.30 ppt | No federal limit |
Data source: EPA Unregulated Contaminant Monitoring Rule, 5th cycle (UCMR 5) — January 2026 release.
UCMR 5 tested ~10,000 public water systems serving more than 25 people between 2023-2025 for 29 PFAS compounds.
Detection values represent the highest single-sample result measured at entry points to the distribution system.