F0/100
CLAY RWS/SOUTH UNION — Water Quality Report 2026
Serving 1,447 people · South Dakota
Water Source
Groundwater
County
—
System ID
SD4602185
Violations
157
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2004.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About CLAY RWS/SOUTH UNION
Is CLAY RWS/SOUTH UNION water safe to drink?
CLAY RWS/SOUTH UNION water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 157 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has CLAY RWS/SOUTH UNION detected?
1 contaminants were tested in CLAY RWS/SOUTH UNION's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does CLAY RWS/SOUTH UNION have any EPA violations?
Yes, CLAY RWS/SOUTH UNION has 157 EPA violation(s) on record, with the most recent in 2004. Violation types include MR, Other.
How many people does CLAY RWS/SOUTH UNION serve?
CLAY RWS/SOUTH UNION serves approximately 1,447 people, South Dakota. The system provides water to 1 community: Wakonda.
What type of water does CLAY RWS/SOUTH UNION provide?
CLAY RWS/SOUTH UNION sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is SD4602185.
How does CLAY RWS/SOUTH UNION compare to other utilities in South Dakota?
CLAY RWS/SOUTH UNION scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our South Dakota state page for a full comparison of water systems.