Public water system · MT0005056
ActiveSundance Subdivision
At a glance
Sundance Subdivision (PWSID MT0005056) is an active community water system in Yellowstone County, Montana. It reports serving 378 people through 126 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
378
Service connections
126
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Sundance Subdivision compare with other water systems in Yellowstone County?
By EPA's size categories, Sundance Subdivision is a very small system (500 people or fewer). Yellowstone County has 119 active public water systems. Its population served is well below the county average of 1,422 people per system, and accounts for 0.2% of the 169,240 people reported by systems filed under the county. Across Montana, the 2,378 active systems average 489 people each. Nationally, the average active community water system reports serving 6,703 people, so Sundance Subdivision 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. Montana has 853 active community water systems, 36% of the state's 2,378 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,994 Montana systems (84%) list groundwater as their primary source.
Who owns and regulates Sundance Subdivision?
EPA lists Sundance Subdivision as privately owned. The MT state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 97 of the 119 active systems in Yellowstone County (82%) are also privately owned.
Does Sundance Subdivision have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for Sundance Subdivision. For the latest compliance status, check EPA ECHO for current compliance history.
Sundance Subdivision: frequently asked questions
Who runs Sundance Subdivision?
Sundance Subdivision (PWSID MT0005056) is a community water system privately owned. It is regulated by the MT state drinking water program.
How many people does Sundance Subdivision serve?
Sundance Subdivision reports serving 378 people through 126 service connections in Yellowstone County, Montana.
Where does Sundance Subdivision 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 Sundance Subdivision have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Sundance Subdivision'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 Safe Drinking Water Act records list no violations for this system. For current results, consult the system's annual water quality report, EPA ECHO, or the MT state drinking water program.
Where can I find Sundance Subdivision's water quality report?
As a community water system, Sundance Subdivision 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 Yellowstone County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Billings City of | Yellowstone | 114,000 | Community | Surface water |
| Billings Heights Co Water Dist of | Yellowstone | 12,000 | Community | Purchased surface water |
| Laurel Municipal Water System | Yellowstone | 6,339 | Community | Surface water |
| Lockwood Water and Sewer District | Yellowstone | 5,900 | Community | Surface water |
| Rocky Mountain College | Yellowstone | 5,700 | Non-transient non-community | Purchased surface water |
| Montana State University Billings | Yellowstone | 2,999 | Non-transient non-community | Purchased surface water |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Sundance Subdivision, PWSID MT0005056, Montana”, https://aquacensus.com/water-systems/montana/sundance-subdivision-mt0005056 (data as of October 1, 2026).