Public water system · SD4602185

Active

Clay Rws/South Union

At a glance

Clay Rws/South Union (PWSID SD4602185) is an active community water system in Union County, South Dakota. It reports serving 1,447 people through 579 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2004.

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

Population served

1,447

Service connections

579

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDSD4602185

System typeCommunity water system

Activity statusActive

Population served1,447

Service connections579

Primary water sourceGroundwater

Owner typePrivate

Primacy agencySD state drinking water program

City servedWakonda

StateSouth Dakota

ZIP57073

CountyUnion County

How does Clay Rws/South Union compare with other water systems in Union County?

By EPA's size categories, Clay Rws/South Union is a small system (501 to 3,300 people). Union County has 8 active public water systems, and Clay Rws/South Union is the 5th-largest of them by population served. Its population served is about 18% below the county average of 1,761 people per system, and accounts for 10% of the 14,087 people reported by systems filed under the county. 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 Clay Rws/South Union 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. 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 Clay Rws/South Union?

EPA lists Clay Rws/South Union 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. 2 of the 8 active systems in Union County (25%) are also privately owned.

Does Clay Rws/South Union have drinking water violations?

Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2004. The violations listed here began between April 2004 and April 2004. By type: 12 monitoring and reporting. The contaminants or rules involved are Pentachlorophenol, Heptachlor epoxide, Atrazine and Benzo(a)pyrene. 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
2004-04-01	Monitoring and reportingMonitoring, Regular · code 03	Pentachlorophenolcode 2326	No	Resolved
2004-04-01	Monitoring and reportingMonitoring, Regular · code 03	Heptachlor epoxidecode 2067	No	Resolved
2004-04-01	Monitoring and reportingMonitoring, Regular · code 03	Atrazinecode 2050	No	Resolved
2004-04-01	Monitoring and reportingMonitoring, Regular · code 03	Benzo(a)pyrenecode 2306	No	Resolved
2004-04-01	Monitoring and reportingMonitoring, Regular · code 03	Methoxychlorcode 2015	No	Resolved
2004-04-01	Monitoring and reportingMonitoring, Regular · code 03	Carbofurancode 2046	No	Resolved
2004-04-01	Monitoring and reportingMonitoring, Regular · code 03	Hexachlorocyclopentadienecode 2042	No	Resolved
2004-04-01	Monitoring and reportingMonitoring, Regular · code 03	Endrincode 2005	No	Resolved
2004-04-01	Monitoring and reportingMonitoring, Regular · code 03	Chlordanecode 2959	No	Resolved
2004-04-01	Monitoring and reportingMonitoring, Regular · code 03	Simazinecode 2037	No	Resolved
2004-04-01	Monitoring and reportingMonitoring, Regular · code 03	2,4,5-TP (Silvex)code 2110	No	Resolved
2004-04-01	Monitoring and reportingMonitoring, Regular · code 03	1,2-Dibromo-3-chloropropane (DBCP)code 2931	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.

Clay Rws/South Union: frequently asked questions

Who runs Clay Rws/South Union?

Clay Rws/South Union (PWSID SD4602185) is a community water system privately owned. It is regulated by the SD state drinking water program.

How many people does Clay Rws/South Union serve?

Clay Rws/South Union reports serving 1,447 people through 579 service connections in Union County, South Dakota.

Where does Clay Rws/South Union 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 Clay Rws/South Union 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 April 2004. 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 Clay Rws/South Union'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 April 2004. For current results, consult the system's annual water quality report, EPA ECHO, or the SD state drinking water program.

Where can I find Clay Rws/South Union's water quality report?

As a community water system, Clay Rws/South Union 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 Union County

Water system	County	Population served	Type	Source
Dakota Dunes Cid	Union	3,700	Community	Purchased groundwater under influence
North Sioux City	Union	3,042	Community	Groundwater
Beresford	Union	2,359	Community	Purchased groundwater
Elk Point	Union	2,124	Community	Groundwater
Alcester	Union	820	Community	Purchased groundwater
Jefferson	Union	475	Community	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, “Clay Rws/South Union, PWSID SD4602185, South Dakota”, https://aquacensus.com/water-systems/south-dakota/clay-rws-south-union-sd4602185 (data as of October 1, 2026).