Public water system · SD4600010

Active

Eagle Butte

At a glance

Eagle Butte (PWSID SD4600010) is an active community water system in Dewey County, South Dakota. It reports serving 4,000 people through 900 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in November 2024.

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

Population served

4,000

Service connections

900

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDSD4600010

System typeCommunity water system

Activity statusActive

Population served4,000

Service connections900

Primary water sourcePurchased surface water

Owner typeLocal government

Primacy agencySD state drinking water program

City servedEagle Butte

StateSouth Dakota

ZIP57625

CountyDewey County

How does Eagle Butte compare with other water systems in Dewey County?

By EPA's size categories, Eagle Butte is a medium system (3,301 to 10,000 people). Dewey County has 5 active public water systems, and Eagle Butte is the largest of them by population served. Its population served is about 186% above the county average of 1,400 people per system, and accounts for 57% of the 7,000 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 Eagle Butte is about 40% 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 Eagle Butte?

EPA lists Eagle Butte 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 5 active systems in Dewey County (60%) are also owned by a local government.

Does Eagle Butte have drinking water violations?

Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in November 2024. The violations listed here began between April 2008 and November 2024. By type: 9 monitoring and reporting and 3 required treatment not met. The contaminant or rule involved most often is Chlorine (3 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
2024-11-15	Required treatment not metTreatment Technique, Level 1 Assessment (RTCR) · code 2A	Revised Total Coliform Rulecode 8000	Yes	Resolved
2024-08-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2024-08-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2024-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2018-01-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2017-11-01	Required treatment not metTreatment Technique No Certif. Operator · code 12	Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400	Yes	Resolved
2010-07-02	Monitoring and reportingFailure Submit IDSE/Subpart V Plan Rpt · code 35	Stage 2 Disinfectants and Disinfection Byproducts Rulecode 0600	No	Resolved
2010-02-01	Required treatment not metTreatment Technique No Certif. Operator · code 12	Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400	Yes	Resolved
2009-07-01	Monitoring and reportingMonitoring, Routine (IDSE) · code 30	Haloacetic acids (HAA5)code 2456	No	Resolved
2009-07-01	Monitoring and reportingMonitoring, Routine (IDSE) · code 30	Total trihalomethanes (TTHM)code 2950	No	Resolved
2009-04-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Chlorinecode 0999	No	Resolved
2008-04-01	Monitoring and reportingMonitoring, Routine (IDSE) · code 30	Stage 2 Disinfectants and Disinfection Byproducts Rulecode 0600	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.

Eagle Butte: frequently asked questions

Who runs Eagle Butte?

Eagle Butte (PWSID SD4600010) is a community water system owned by a local government. It is regulated by the SD state drinking water program.

How many people does Eagle Butte serve?

Eagle Butte reports serving 4,000 people through 900 service connections in Dewey County, South Dakota.

Where does Eagle Butte 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 Eagle Butte have any drinking water violations?

Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in November 2024. 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 Eagle Butte'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, 3 are health-based, and the most recent began in November 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the SD state drinking water program.

Where can I find Eagle Butte's water quality report?

As a community water system, Eagle Butte 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 Dewey County

Water system	County	Population served	Type	Source
Tri-County Rural Water System	Dewey + 2 more	2,190	Community	Surface water
Timber Lake	Dewey	499	Community	Groundwater
T C & G Rural Water System	Dewey	166	Community	Groundwater
Isabel	Dewey	145	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, “Eagle Butte, PWSID SD4600010, South Dakota”, https://aquacensus.com/water-systems/south-dakota/eagle-butte-sd4600010 (data as of October 1, 2026).