Grant-roberts Rural Water System
EPA ID: SD4600864 · 5,050 people served · 14 ZIP codes
ZipCheckup's reading of EPA records for Grant-roberts Rural Water System (SD4600864): 1 violation on record since 2021. Past violations at Grant-roberts Rural Water System total 1, all marked resolved; it supplies 5,050 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Grant-roberts Rural Water System Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Grant-roberts Rural Water System have a median household income of $72,763 and about 37,207 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 69% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Grant-roberts 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
Grant-roberts Rural Water System (EPA ID: SD4600864) is a community water system in South Dakota that serves approximately 5,050 people from groundwater sources.
This system provides water to 14 ZIP codes across 14 communities.
Violation History
Status breakdown for accepted records with record years 2021-2026: 1 resolved, 0 archived, 0 addressed, and 0 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| January 1, 2022 | Nitrate | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Nitrate | Monitoring & Reporting | 1 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.003 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
14 of 14 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
- 57216 - Big Stone City
- 57227 - Corona
- 57246 - Labolt
- 57251 - Marvin
- 57252 - Milbank
- 57256 - Ortley
- 57259 - Revillo
- 57263 - South Shore
- 57264 - Stockholm
- 57265 - Strandburg
- 57266 - Summit
- 57269 - Twin Brooks
- 57279 - Wilmot
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Grant-roberts Rural Water System (SD4600864) on EPA.gov.
Frequently Asked Questions
Is Grant-roberts Rural Water System water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Grant-roberts Rural Water System; its 1 accepted 2021-2026 record are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Grant-roberts Rural Water System serve?
Grant-roberts Rural Water System serves approximately 5,050 people across 14 ZIP codes in South Dakota.
Where does Grant-roberts Rural Water System get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: No PFAS Reported Above Reporting Levels
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were reported above UCMR5 minimum reporting levels.
EPA's April 2024 PFAS rule sets MCLs of 4 ppt for PFOA and PFOS and 10 ppt for PFHxS, PFNA and HFPO-DA (GenX); water systems must comply from 2029. Other PFAS compounds have no individual federal MCL. A state standard is shown only where this system's state has its own enforceable PFAS limit. Detection results are EPA UCMR5 samples, not a measurement at your tap.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Grant-roberts Rural Water System (SD): 1 EPA Violation. https://zipcheckup.com/water-system/sd4600864/
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title = {{Grant-roberts Rural Water System (SD): 1 EPA Violation}},
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url = {https://zipcheckup.com/water-system/sd4600864/}
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What You Can Do
Test your water
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Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Grant-roberts Rural Water System (EPA ID: SD4600864) - request the latest Consumer Confidence Report or ask about specific contaminants.