Public water system · SD4600120

Active

Ethan

At a glance

Ethan (PWSID SD4600120) is an active community water system in Davison County, South Dakota. It reports serving 320 people through 163 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. EPA's records list 9 violations for this system; 1 is health-based, and the most recent began in July 2017.

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

Population served

320

Service connections

163

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDSD4600120

System typeCommunity water system

Activity statusActive

Population served320

Service connections163

Primary water sourcePurchased surface water

Owner typeLocal government

Primacy agencySD state drinking water program

City servedEthan

StateSouth Dakota

ZIP57334

CountyDavison County

How does Ethan compare with other water systems in Davison County?

By EPA's size categories, Ethan is a very small system (500 people or fewer). Davison County has 4 active public water systems, and Ethan is the 4th-largest of them by population served. Its population served is well below the county average of 4,979 people per system, and accounts for 1.6% of the 19,917 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 Ethan 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 Ethan?

EPA lists Ethan as owned by a local government. 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. 3 of the 4 active systems in Davison County (75%) are also owned by a local government.

Does Ethan have drinking water violations?

EPA's records list 9 violations for this system; 1 is health-based, and the most recent began in July 2017. The violations listed here began between July 1976 and July 2017. By type: 6 monitoring and reporting, 2 public notice, recordkeeping or other and 1 required treatment not met. The contaminant or rule involved most often is Total coliform bacteria (TCR) (3 of them). EPA lists 6 as resolved and 3 as archived. 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.

Began	Violation	Contaminant or rule	Health-based	Status
2017-07-21	Required treatment not metTreatment Technique No Certif. Operator · code 12	Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400	Yes	Resolved
2005-08-09	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2004-09-05	Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75	Public Noticecode 7500	No	Resolved
2004-07-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2003-08-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1993-07-01	Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51	Lead and Copper Rulecode 5000	No	Resolved
1993-04-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Archived
1976-07-01	Monitoring and reportingMonitoring, Regular · code 03	Combined Radium (-226 and -228)code 4010	No	Archived
1976-07-01	Monitoring and reportingMonitoring, Regular · code 03	Gross alpha (excluding radon and uranium)code 4000	No	Archived

All 9 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.

Ethan: frequently asked questions

Who runs Ethan?

Ethan (PWSID SD4600120) is a community water system owned by a local government. It is regulated by the SD state drinking water program.

How many people does Ethan serve?

Ethan reports serving 320 people through 163 service connections in Davison County, South Dakota.

Where does Ethan 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 Ethan have any drinking water violations?

EPA's records list 9 violations for this system; 1 is health-based, and the most recent began in July 2017. 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 Ethan'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 9 violations for this system; 1 is health-based, and the most recent began in July 2017. For current results, consult the system's annual water quality report, EPA ECHO, or the SD state drinking water program.

Where can I find Ethan's water quality report?

As a community water system, Ethan 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 Davison County

Water system	County	Population served	Type	Source
Mitchell	Davison	15,651	Community	Purchased surface water
Davison Rural Water System Inc.	Davison + 4 more	3,485	Community	Purchased surface water
Mount Vernon	Davison	461	Community	Purchased 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, “Ethan, PWSID SD4600120, South Dakota”, https://aquacensus.com/water-systems/south-dakota/ethan-sd4600120 (data as of October 1, 2026).