Clark Rural Water System
EPA ID: SD4600881 · 2,325 people served · 16 ZIP codes
ZipCheckup's reading of EPA records for Clark Rural Water System (SD4600881): no drinking-water violations recorded since 2021. Clark Rural Water System's compliance file in EPA SDWIS lists no violations, whether health-based or monitoring and reporting, for a utility that supplies water to approximately 2,325 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Clark Rural Water System Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Clark Rural Water System have a median household income of $66,782 and about 37,752 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 74% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: On average, 64% of census tracts in the counties mapped to this service area are designated disadvantaged by the federal Climate and Economic Justice Screening Tool (CEJST, 2022 version). Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
💧 Where Does Your Water Come From?
Clark Rural Water System'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
Clark Rural Water System (EPA ID: SD4600881) is a community water system in South Dakota that serves approximately 2,325 people from groundwater sources.
This system provides water to 16 ZIP codes across 16 communities.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| Below the reporting limit | 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
16 of 16 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.
- 57201 - Watertown
- 57217 - Bradley
- 57221 - Bryant
- 57225 - Clark
- 57235 - Florence
- 57236 - Garden City
- 57238 - Goodwin
- 57242 - Hazel
- 57243 - Henry
- 57258 - Raymond
- 57263 - South Shore
- 57271 - Vienna
- 57272 - Wallace
- 57273 - Waubay
- 57274 - Webster
- 57278 - Willow Lake
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Clark Rural Water System (SD4600881) on EPA.gov.
Frequently Asked Questions
Is Clark Rural Water System water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Clark Rural Water System 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 Clark Rural Water System serve?
Clark Rural Water System serves approximately 2,325 people across 16 ZIP codes in South Dakota.
Where does Clark Rural Water System get its water?
The primary water source is groundwater.
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Clark Rural Water System Water Quality Report, SD. https://zipcheckup.com/water-system/sd4600881/
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