ZIP Code 57201
Low Level3
PFAS Detected
0
Above EPA Limits
3
Water Systems
N/A
Highest % of MCL
WATERTOWN MUNICIPAL UTILITIES
SD4600356 Low LevelWater Type
Groundwater
PFAS Detected
1
Above MCL
0
State
South Dakota
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 12400.00ppt | No federal limit | — | Unregulated |
GRANT-ROBERTS RURAL WATER SYSTEM
SD4600864 Low LevelWater Type
Groundwater
PFAS Detected
1
Above MCL
0
State
South Dakota
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 55700.00ppt | No federal limit | — | Unregulated |
SIOUX RURAL WATER SYSTEM
SD4600866 Low LevelWater Type
Groundwater
PFAS Detected
1
Above MCL
0
State
South Dakota
Data Period
2023–2025
PFAS Test Results
| Compound | Detected | vs. EPA Limit | EPA Limit | Status |
|---|---|---|---|---|
lithium | 52200.00ppt | No federal limit | — | Unregulated |
Note: ZIP code 57201 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.