ZIP Code 78582
Low Level8
PFAS Detected
0
Above EPA Limits
3
Water Systems
N/A
Highest % of MCL
UNION WSC
TX2140004 Low LevelWater Type
Surface Water
PFAS Detected
4
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 43400.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 7.10ppt | No federal limit | — | Unregulated |
PFPeA Perfluoropentanoic acid | 6.90ppt | No federal limit | — | Unregulated |
PFHxA Perfluorohexanoic acid | 6.10ppt | No federal limit | — | Unregulated |
RIO WSC
TX2140016 Low LevelWater Type
Surface Water
PFAS Detected
2
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 43700.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 7.70ppt | No federal limit | — | Unregulated |
CITY OF RIO GRANDE CITY
TX2140018 Low LevelWater Type
Surface Water
PFAS Detected
2
Above MCL
0
State
Texas
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 45400.00ppt | No federal limit | — | Unregulated |
PFBA Perfluorobutanoic acid | 6.10ppt | No federal limit | — | Unregulated |
Note: ZIP code 78582 is served by 3 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.