Public water system · SD4600339
ActiveBoulder Colony
At a glance
Boulder Colony (PWSID SD4600339) is an active community water system in Edmunds County, South Dakota. It reports serving 26 people through 8 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list one violation for this system; it is health-based, and the most recent began in November 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
26
Service connections
8
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Boulder Colony compare with other water systems in Edmunds County?
By EPA's size categories, Boulder Colony is a very small system (500 people or fewer). Edmunds County has 6 active public water systems, and Boulder Colony is the 6th-largest of them by population served. Its population served is well below the county average of 453 people per system, and accounts for 1% of the 2,720 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 Boulder Colony 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 Boulder Colony?
EPA lists Boulder Colony 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. 1 of the 6 active systems in Edmunds County (17%) are also privately owned.
Does Boulder Colony have drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in November 2025. By type: 1 required treatment not met. The contaminant or rule involved is Stage 1 Disinfectants and Disinfection Byproducts Rule. EPA lists 1 as unaddressed. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-11-12 | Required treatment not metTreatment Technique No Certif. Operator · code 12 | Stage 1 Disinfectants and Disinfection Byproducts Rulecode 0400 | Yes | Unaddressed |
The one violation in EPA's records.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.
Boulder Colony: frequently asked questions
Who runs Boulder Colony?
Boulder Colony (PWSID SD4600339) is a community water system privately owned. It is regulated by the SD state drinking water program.
How many people does Boulder Colony serve?
Boulder Colony reports serving 26 people through 8 service connections in Edmunds County, South Dakota.
Where does Boulder Colony 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 Boulder Colony have any drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in November 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 Boulder Colony'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 one violation for this system; it is health-based, and the most recent began in November 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the SD state drinking water program.
Where can I find Boulder Colony's water quality report?
As a community water system, Boulder Colony 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 Edmunds County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Ipswich | Edmunds | 928 | Community | Purchased surface water |
| Mina Lake Sanitary District | Edmunds | 863 | Community | Purchased surface water |
| Bowdle | Edmunds | 470 | Community | Purchased surface water |
| Roscoe | Edmunds | 269 | Community | Purchased surface water |
| Hosmer | Edmunds | 164 | 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, “Boulder Colony, PWSID SD4600339, South Dakota”, https://aquacensus.com/water-systems/south-dakota/boulder-colony-sd4600339 (data as of October 1, 2026).