CheckPFAS

ZIP Code 78570

Moderate
Moderate PFAS Risk Level
6
PFAS Detected
0
Above EPA Limits
2
Water Systems
34%
Highest % of MCL
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CITY OF MERCEDES

TX1080007 Low Level
Water Type
MX
PFAS Detected
1
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFHxA
Perfluorohexanoic acid
3.30pptNo federal limit—Unregulated

NORTH ALAMO WSC

TX1080029 Moderate
Water Type
Surface Water
PFAS Detected
5
Above MCL
0
State
Texas
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFHxS
Perfluorohexane sulfonic acid
3.40ppt
34% of limit
10 pptBelow limit
PFBA
Perfluorobutanoic acid
12.20pptNo federal limit—Unregulated
PFPeA
Perfluoropentanoic acid
3.80pptNo federal limit—Unregulated
PFHxA
Perfluorohexanoic acid
3.50pptNo federal limit—Unregulated
PFBS
Perfluorobutane sulfonic acid
3.00pptNo federal limit—Unregulated
Note: ZIP code 78570 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.

View raw EPA data →