Clay Rws/south Union
EPA ID: SD4602185 · 1,447 people served · 3 ZIP codes
ZipCheckup's reading of EPA records for Clay Rws/south Union (SD4602185): no drinking-water violations recorded since 2021. Clay Rws/south Union is listed without violations in federal records, across a service area of 1,447 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Clay Rws/south Union Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Clay Rws/south Union have a median household income of $88,466 and about 12,692 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 47% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Clay Rws/south Union's water is classified in EPA records as a groundwater source. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in South Dakota
System Overview
Clay Rws/south Union (EPA ID: SD4602185) is a community water system in South Dakota that serves approximately 1,447 people from groundwater sources.
This system provides water to 3 ZIP codes across 3 communities.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.001 mg/L | No | 2025-12-31 |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Radon Risk in Service Area
3 of 3 ZIP records with known zones are in EPA Radon Zone 1.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by SD or modeled from parcel and building-footprint data.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Clay Rws/south Union (SD4602185) on EPA.gov.
Frequently Asked Questions
Is Clay Rws/south Union water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Clay Rws/south Union in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does Clay Rws/south Union serve?
Clay Rws/south Union serves approximately 1,447 people across 3 ZIP codes in South Dakota.
Where does Clay Rws/south Union get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Clay Rws/south Union Water Quality Report, SD. https://zipcheckup.com/water-system/sd4602185/
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title = {{Clay Rws/south Union Water Quality Report, SD}},
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url = {https://zipcheckup.com/water-system/sd4602185/}
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