Public water system · SD4600866

Active

Sioux Rural Water System

At a glance

Sioux Rural Water System (PWSID SD4600866) is an active community water system serving Hamlin, Clark, Codington and Deuel counties, South Dakota. It reports serving 4,280 people through 1,712 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in January 2022.

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

Population served

4,280

Service connections

1,712

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDSD4600866

System typeCommunity water system

Activity statusActive

Population served4,280

Service connections1,712

Primary water sourceGroundwater

Owner typePrivate

Primacy agencySD state drinking water program

City servedWatertown

StateSouth Dakota

ZIP57201

Counties servedHamlin, Clark, Codington, Deuel

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

By EPA's size categories, Sioux Rural Water System is a medium system (3,301 to 10,000 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 Sioux Rural Water System is about 36% 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 431 South Dakota systems (62%) list groundwater as their primary source.

Who owns and regulates Sioux Rural Water System?

EPA lists Sioux Rural Water System as privately owned. The SD state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act.

Does Sioux Rural Water System have drinking water violations?

EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in January 2022. The violations listed here began between April 2020 and January 2022. By type: 3 monitoring and reporting and 1 contaminant level above the legal limit. The contaminants or rules involved are Gross alpha (excluding radon and uranium), Combined Uranium, Combined Radium (-226 and -228) and Total trihalomethanes (TTHM). EPA lists 4 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
2022-01-01	Monitoring and reportingMonitoring, Regular · code 03	Gross alpha (excluding radon and uranium)code 4000	No	Resolved
2022-01-01	Monitoring and reportingMonitoring, Regular · code 03	Combined Uraniumcode 4006	No	Resolved
2022-01-01	Monitoring and reportingMonitoring, Regular · code 03	Combined Radium (-226 and -228)code 4010	No	Resolved
2020-04-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02	Total trihalomethanes (TTHM)code 2950	Yes	Resolved

All 4 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.

Sioux Rural Water System: frequently asked questions

Who runs Sioux Rural Water System?

Sioux Rural Water System (PWSID SD4600866) is a community water system privately owned. It is regulated by the SD state drinking water program.

How many people does Sioux Rural Water System serve?

Sioux Rural Water System reports serving 4,280 people through 1,712 service connections in Hamlin, Clark, Codington and Deuel counties, South Dakota.

Where does Sioux Rural Water System get its water?

EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.

Does Sioux Rural Water System have any drinking water violations?

EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in January 2022. 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 Sioux Rural 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. EPA's records list 4 violations for this system; 1 is health-based, and the most recent began in January 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the SD state drinking water program.

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

As a community water system, Sioux Rural 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 Hamlin County(the first county EPA lists for this system)

Water system	County	Population served	Type	Source
Estelline	Hamlin	749	Community	Purchased groundwater
Castlewood	Hamlin	698	Community	Purchased groundwater
Lake Norden	Hamlin	554	Community	Groundwater
Bryant	Hamlin	471	Community	Purchased groundwater
Hayti	Hamlin	393	Community	Purchased groundwater

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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, “Sioux Rural Water System, PWSID SD4600866, South Dakota”, https://aquacensus.com/water-systems/south-dakota/sioux-rural-water-system-sd4600866 (data as of October 1, 2026).