ZIP Code 57078
Low Level3
PFAS Detected
0
Above EPA Limits
3
Water Systems
N/A
Highest % of MCL
YANKTON
SD4600423 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 | 69000.00ppt | No federal limit | — | Unregulated |
CLAY RURAL WATER SYSTEM
SD4600626 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 | 52500.00ppt | No federal limit | — | Unregulated |
BON HOMME-YANKTON RWS
SD4600865 Low LevelWater Type
Surface Water
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 | 52000.00ppt | No federal limit | — | Unregulated |
Note: ZIP code 57078 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.