ZIP Code 98501
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.
6
PFAS Detected
2
Above EPA Limits
2
Water Systems
145%
Highest % of MCL
Compounds Exceeding EPA Limits
PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 145% of limit
Detected: 5.80 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 108% of limit
Detected: 4.30 ppt
OLYMPIA CITY OF
WA5363450 High RiskWater Type
Groundwater
PFAS Detected
5
Above MCL
2
State
Washington
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFOS Perfluorooctane sulfonic acid | 5.80ppt | 145% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFOA Perfluorooctanoic acid | 4.30ppt | 108% of limit
| 4 ppt | ⚠ Exceeds MCL |
PFBS Perfluorobutane sulfonic acid | 4.80ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 4.00ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 3.30ppt | No federal limit | — | Unregulated |
TUMWATER CITY OF
WA5389700 Low LevelWater Type
Groundwater
PFAS Detected
1
Above MCL
0
State
Washington
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
PFBS Perfluorobutane sulfonic acid | 6.80ppt | No federal limit | — | Unregulated |
Note: ZIP code 98501 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.