Flandreau
EPA ID: SD4600127 · 2,372 people served · 2 ZIP codes
ZipCheckup's reading of EPA records for Flandreau (SD4600127): 1 health-based violation recorded since 2021. Flandreau has 2 EPA violations on record, all marked resolved in the federal data; the utility serves 2,372 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Flandreau Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Flandreau have a median household income of $83,368 and about 3,643 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 79% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Flandreau'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.
Wastewater Proximity Note: This service area ranks in the 60th percentile nationally for proximity to wastewater discharge points.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in South Dakota
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Flandreau (EPA ID: SD4600127) is a community water system in South Dakota that serves approximately 2,372 people from groundwater sources.
This system provides water to 2 ZIP codes across 2 communities.
Violation History
Status breakdown for accepted records with record years 2021-2026: 2 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 |
|---|---|---|---|
| October 1, 2023 | Lead and Copper Rule | Non-health-based | Resolved |
| July 27, 2022 | Stage 1 Disinfectants and Disinfection Byproducts Rule | Health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Lead and Copper Rule | Monitoring & Reporting | 1 | No |
| Stage 1 Disinfectants and Disinfection Byproducts Rule | Treatment Technique | 1 | Yes |
Health Risk Details
Chlorine (Residual Disinfectant) (EPA limit: 4 mg/L (MRDL — Maximum Residual Disinfectant Level))
Irritation & DBP formation at high levels At-risk groups: kidney dialysis patients (dialysis water must be dechlorinated).
Treatment options (verify a product is certified to reduce this contaminant): granular activated carbon (GAC), KDF media filter, carbon block filter. Find the right filter →
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 | 2024-12-31 |
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
2 of 2 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 Flandreau (SD4600127) on EPA.gov.
Frequently Asked Questions
Is Flandreau water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Flandreau; its 2 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Flandreau serve?
Flandreau serves approximately 2,372 people across 2 ZIP codes in South Dakota.
Where does Flandreau get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Flandreau (SD): 1 Health Violation. https://zipcheckup.com/water-system/sd4600127/
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author = {{ZipCheckup}},
title = {{Flandreau (SD): 1 Health Violation}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/sd4600127/}
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What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Flandreau (EPA ID: SD4600127) - request the latest Consumer Confidence Report or ask about specific contaminants.