Public water system · MT0003978
ActiveTwin Hills Colony Inc.
At a glance
Twin Hills Colony Inc. (PWSID MT0003978) is an active community water system in Chouteau County, Montana. It reports serving 78 people through 19 service connections. Its primary water source is purchased surface water, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in December 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
78
Service connections
19
Primary source
SWP
Purchased surface water
System type
CWS
Community water system
System record
How does Twin Hills Colony Inc. compare with other water systems in Chouteau County?
By EPA's size categories, Twin Hills Colony Inc. is a very small system (500 people or fewer). Chouteau County has 12 active public water systems. Its population served is well below the county average of 288 people per system, and accounts for 2.3% of the 3,456 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 Twin Hills Colony Inc. 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. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 212 Montana systems (8.9%) list purchased surface water as their primary source.
Who owns and regulates Twin Hills Colony Inc.?
EPA lists Twin Hills Colony Inc. 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. 2 of the 12 active systems in Chouteau County (17%) are also privately owned.
Does Twin Hills Colony Inc. have drinking water violations?
Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in December 2024. The violations listed here began between January 2020 and December 2024. By type: 8 monitoring and reporting, 3 contaminant level above the legal limit and 1 monitoring. The contaminant or rule involved most often is Haloacetic acids (HAA5) (4 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 |
|---|---|---|---|---|
| 2024-12-30 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2024-07-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2024-06-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2024-01-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2022-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2022-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2021-12-30 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2020-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2020-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2020-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2020-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2020-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | 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.
Twin Hills Colony Inc.: frequently asked questions
Who runs Twin Hills Colony Inc.?
Twin Hills Colony Inc. (PWSID MT0003978) is a community water system privately owned. It is regulated by the MT state drinking water program.
How many people does Twin Hills Colony Inc. serve?
Twin Hills Colony Inc. reports serving 78 people through 19 service connections in Chouteau County, Montana.
Where does Twin Hills Colony Inc. 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 Twin Hills Colony Inc. 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 December 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 Twin Hills Colony Inc.'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 December 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the MT state drinking water program.
Where can I find Twin Hills Colony Inc.'s water quality report?
As a community water system, Twin Hills Colony Inc. 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 Chouteau County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Fort Benton City of | Chouteau | 1,500 | Community | Groundwater |
| Big Sandy Town of | Chouteau | 608 | Community | Groundwater |
| Highwood County Water and Sewer District | Chouteau | 280 | Community | Groundwater |
| Geraldine Town of | Chouteau | 260 | Community | Groundwater |
| Loma County Water District | Chouteau | 200 | Community | Surface water |
| Carter Chouteau Co Water Dist | Chouteau | 150 | Community | 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, “Twin Hills Colony Inc., PWSID MT0003978, Montana”, https://aquacensus.com/water-systems/montana/twin-hills-colony-inc-mt0003978 (data as of October 1, 2026).