CheckPFAS

ZIP Code 57703

High Risk
High Risk PFAS Risk Level

PFAS above EPA limits detected

1 compound exceed EPA Maximum Contaminant Levels in water serving this ZIP code. Standard pitcher filters like Brita do not remove PFAS. See filter recommendations below.

4
PFAS Detected
1
Above EPA Limits
2
Water Systems
143%
Highest % of MCL

Compounds Exceeding EPA Limits

PFOS Exceeds EPA limit
0 ppt MCL: 4 ppt 143% of limit
Detected: 5.70 ppt
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BOX ELDER

SD4600046 Low Level
Water Type
Groundwater
PFAS Detected
1
Above MCL
0
State
South Dakota
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
14000.00pptNo federal limit—Unregulated

RAPID VALLEY SANITARY DISTRICT

SD4600274 High Risk
Water Type
Surface Water
PFAS Detected
3
Above MCL
1
State
South Dakota
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFOS
Perfluorooctane sulfonic acid
5.70ppt
143% of limit
4 ppt⚠ Exceeds MCL
PFHxS
Perfluorohexane sulfonic acid
5.80ppt
58% of limit
10 pptBelow limit
lithium
23400.00pptNo federal limit—Unregulated
Note: ZIP code 57703 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 →