Public water system · 084690465

Active

Flandreau School

At a glance

Flandreau School (PWSID 084690465) is an active community water system in South Dakota. It reports serving 375 people through 23 service connections. Its primary water source is purchased groundwater, and EPA lists it as owned by the federal government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2025.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

375

Service connections

Primary source

GWP

Purchased groundwater

System type

CWS

Community water system

System record

PWSID084690465

System typeCommunity water system

Activity statusActive

Population served375

Service connections23

Primary water sourcePurchased groundwater

Owner typeFederal government

Primacy agencyEPA Region 08

City served—

StateSouth Dakota

ZIP—

County—

How does Flandreau School compare with other water systems in South Dakota?

By EPA's size categories, Flandreau School is a very small system (500 people or fewer). Across South Dakota, the 699 active systems average 1,387 people each. Nationally, the average active community water system reports serving 6,703 people, so Flandreau School is well below that figure.

What does “community water system” mean?

A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. South Dakota has 510 active community water systems, 73% of the state's 699 active systems. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own. 100 South Dakota systems (14%) list purchased groundwater as their primary source.

Who owns and regulates Flandreau School?

EPA lists Flandreau School as owned by the federal government. The EPA Region 08 is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act.

Does Flandreau School have drinking water violations?

Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2025. The violations listed here began between January 2018 and October 2025. By type: 10 monitoring and reporting and 2 monitoring. The contaminant or rule involved most often is Lead and Copper Rule (4 of them). EPA lists 6 as resolved, 4 as archived and 2 as unaddressed. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.

Began	Violation	Contaminant or rule	Health-based	Status
2025-10-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Unaddressed
2025-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Archived
2025-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Archived
2024-12-30	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2023-10-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Unaddressed
2023-07-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2022-09-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2022-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Archived
2022-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Archived
2020-12-30	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2018-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2018-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved

The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.

Flandreau School: frequently asked questions

Who runs Flandreau School?

Flandreau School (PWSID 084690465) is a community water system owned by the federal government. It is regulated by the EPA Region 08.

How many people does Flandreau School serve?

Flandreau School reports serving 375 people through 23 service connections in South Dakota.

Where does Flandreau School get its water?

EPA SDWIS lists this system's primary water source as purchased groundwater. Purchased groundwater means the system buys groundwater from another public water system rather than drawing its own.

Does Flandreau School have any drinking water violations?

Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2025. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.

Is Flandreau School's water safe to drink?

AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the EPA Region 08.

Where can I find Flandreau School's water quality report?

As a community water system, Flandreau School must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.

Other water systems in South Dakota

Water system	County	Population served	Type	Source
Sioux Falls	Minnehaha	216,462	Community	Surface water
Rapid City	Pennington	72,009	Community	Surface water
Aberdeen	Brown	27,989	Community	Surface water
Brookings Municipal Utilities	Brookings	23,377	Community	Groundwater
Watertown Municipal Utilities	Codington	23,230	Community	Groundwater
Web Water Development Association	Walworth + 9 more	20,750	Community	Surface water

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About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Flandreau School, PWSID 084690465, South Dakota”, https://aquacensus.com/water-systems/south-dakota/flandreau-school-084690465 (data as of October 1, 2026).