CheckPFAS

ZIP Code 95350

High Risk
High Risk PFAS Risk Level

PFAS 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.

8
PFAS Detected
2
Above EPA Limits
1
Water System
650%
Highest % of MCL

Compounds Exceeding EPA Limits

PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 650% of limit
Detected: 26.00 ppt
PFOA Exceeds EPA limit
0 ppt MCL: 4 ppt 215% of limit
Detected: 8.60 ppt
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MODESTO, CITY OF

CA5010010 High Risk
Water Type
Groundwater
PFAS Detected
8
Above MCL
2
State
California
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFOS
Perfluorooctane sulfonic acid
26.00ppt
650% of limit
4 ppt⚠ Exceeds MCL
PFOA
Perfluorooctanoic acid
8.60ppt
215% of limit
4 ppt⚠ Exceeds MCL
PFHxS
Perfluorohexane sulfonic acid
9.30ppt
93% of limit
10 pptBelow limit
lithium
21000.00pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
6.70pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
6.10pptNo federal limit—Unregulated
PFBS
Perfluorobutane sulfonic acid
4.30pptNo federal limit—Unregulated
PFHpA
Perfluoroheptanoic acid
3.60pptNo federal limit—Unregulated

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.

View raw EPA data →