Public water system · 084690532

Active

Mission Water System

At a glance

Mission Water System (PWSID 084690532) is an active community water system in South Dakota. It reports serving 1,500 people through 550 service connections. Its primary water source is purchased surface water, and EPA lists it as Native American-owned. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in September 2025.

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

Population served

1,500

Service connections

550

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSID084690532

System typeCommunity water system

Activity statusActive

Population served1,500

Service connections550

Primary water sourcePurchased surface water

Owner typeNative American

Primacy agencyEPA Region 08

City served—

StateSouth Dakota

ZIP—

County—

How does Mission Water System compare with other water systems in South Dakota?

By EPA's size categories, Mission Water System is a small system (501 to 3,300 people). 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 Mission Water System 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 surface water means the system buys surface water from another public water system rather than drawing its own. 142 South Dakota systems (20%) list purchased surface water as their primary source.

Who owns and regulates Mission Water System?

EPA lists Mission Water System as Native American-owned. The EPA Region 08 is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act.

Does Mission Water System have drinking water violations?

Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in September 2025. The violations listed here began between January 2014 and September 2025. By type: 7 monitoring and reporting, 2 monitoring, 2 reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Revised Total Coliform Rule (4 of them). EPA lists 12 as resolved. 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.

Began	Violation	Contaminant or rule	Health-based	Status
2025-09-01	Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36	Surface Water Treatment Rulecode 0200	No	Resolved
2025-09-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2024-03-11	ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B	Revised Total Coliform Rulecode 8000	No	Resolved
2023-01-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2022-09-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2022-09-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2022-07-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2021-10-11	ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B	Revised Total Coliform Rulecode 8000	No	Resolved
2021-10-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2018-12-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2014-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2014-01-01	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.

Mission Water System: frequently asked questions

Who runs Mission Water System?

Mission Water System (PWSID 084690532) is a community water system Native American-owned. It is regulated by the EPA Region 08.

How many people does Mission Water System serve?

Mission Water System reports serving 1,500 people through 550 service connections in South Dakota.

Where does Mission Water System get its water?

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

Does Mission Water System have any drinking water violations?

Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in September 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 Mission Water System'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, one is health-based, and the most recent began in September 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the EPA Region 08.

Where can I find Mission Water System's water quality report?

As a community water system, Mission Water System 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, “Mission Water System, PWSID 084690532, South Dakota”, https://aquacensus.com/water-systems/south-dakota/mission-water-system-084690532 (data as of October 1, 2026).