B67/100
FLANDREAU — Water Quality Report 2026
Serving 2,372 people · South Dakota
Water Source
Purchased Groundwater
County
—
System ID
SD4600127
Violations
10
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 2.00 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
1
Health-Related
TIER 3Resolved
Failed to issue ongoing public notification
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 1, 2023 – September 24, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved
Violation related to Nitrite
When: July 27, 2022 – February 8, 2024Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway
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 FLANDREAU
Is FLANDREAU water safe to drink?
FLANDREAU water receives a grade of B (67/100), which is considered good. Out of 2 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has FLANDREAU detected?
2 contaminants were tested in FLANDREAU's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does FLANDREAU have any EPA violations?
Yes, FLANDREAU has 10 EPA violation(s) on record, with the most recent in 2023. Violation types include MR, TT, Other. 3 are health-based violations.
How many people does FLANDREAU serve?
FLANDREAU serves approximately 2,372 people, South Dakota. The system provides water to 1 community: Flandreau.
What type of water does FLANDREAU provide?
FLANDREAU sources its water from purchased groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is SD4600127.
How does FLANDREAU compare to other utilities in South Dakota?
FLANDREAU scores 67/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our South Dakota state page for a full comparison of water systems.