ZIP Code 93257
High RiskPFAS above EPA limits detected
4 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.
15
PFAS Detected
4
Above EPA Limits
2
Water Systems
575%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 575% of limit
Detected: 23.00 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 550% of limit
Detected: 22.00 ppt
PORTERVILLE, CITY OF
CA5410010 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 | 23.00ppt | 575% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 22.00ppt | 550% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFHxS Perfluorohexane sulfonic acid | 3.60ppt | 36% of limit
| 10 ppt | Below limit |
lithium | 11600.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 9.30ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 9.10ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 8.50ppt | No federal limit | — | Unregulated |
PFHpA Perfluoroheptanoic acid | 6.50ppt | No federal limit | — | Unregulated |
Show 1 more compound detected at low levels
| PFBAPerfluorobutanoic acid | 5.80 ppt | No federal limit |
CWS - VISALIA
CA5410016 High RiskWater Type
Groundwater
PFAS Detected
6
Above MCL
2
State
California
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 6.90ppt | 173% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 4.20ppt | 105% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFPeA Perfluoropentanoic acid | 34.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 28.00ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 15.00ppt | No federal limit | — | Unregulated |
PFBS Perfluorobutane sulfonic acid | 4.30ppt | No federal limit | — | Unregulated |
Note: ZIP code 93257 is served by 2 separate water utilities.
Results above show data for each system independently.
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.