Public water system · MT0004854
ActiveHilltop Colony
At a glance
Hilltop Colony (PWSID MT0004854) is an active community water system in Cascade County, Montana. It reports serving 100 people through 12 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2020.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
100
Service connections
12
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Hilltop Colony compare with other water systems in Cascade County?
By EPA's size categories, Hilltop Colony is a very small system (500 people or fewer). Cascade County has 98 active public water systems. Its population served is well below the county average of 985 people per system, and accounts for 0.1% of the 96,513 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 Hilltop 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. 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 Hilltop Colony?
EPA lists Hilltop Colony 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. 73 of the 98 active systems in Cascade County (74%) are also privately owned.
Does Hilltop Colony have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2020. The violations listed here began between April 2017 and July 2020. By type: 11 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminants or rules involved are Consumer Confidence Rule, Lead and Copper Rule, 2,4-D and Gross alpha (excluding radon and uranium). 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 |
|---|---|---|---|---|
| 2020-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2019-04-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2017-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 2,4-Dcode 2105 | No | Resolved |
| 2017-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Resolved |
| 2017-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Atrazinecode 2050 | No | Resolved |
| 2017-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Simazinecode 2037 | No | Resolved |
| 2017-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Lindane (gamma-BHC)code 2010 | No | Resolved |
| 2017-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Endrincode 2005 | No | Resolved |
| 2017-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Dinosebcode 2041 | No | Resolved |
| 2017-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Hexachlorocyclopentadienecode 2042 | No | Resolved |
| 2017-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Oxamylcode 2036 | No | Resolved |
| 2017-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toxaphenecode 2020 | 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.
Hilltop Colony: frequently asked questions
Who runs Hilltop Colony?
Hilltop Colony (PWSID MT0004854) is a community water system privately owned. It is regulated by the MT state drinking water program.
How many people does Hilltop Colony serve?
Hilltop Colony reports serving 100 people through 12 service connections in Cascade County, Montana.
Where does Hilltop 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 Hilltop Colony have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2020. 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 Hilltop 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. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2020. For current results, consult the system's annual water quality report, EPA ECHO, or the MT state drinking water program.
Where can I find Hilltop Colony's water quality report?
As a community water system, Hilltop 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 Cascade County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Great Falls City of | Cascade | 60,000 | Community | Surface water |
| Malmstrom Air Force Base | Cascade | 8,850 | Community | Purchased surface water |
| Source Giant Springs Inc. | Cascade | 3,007 | Non-transient non-community | Groundwater |
| Montana Expo Park Cascade County | Cascade | 2,510 | Transient non-community | Purchased surface water |
| Sun Prairie Village County | Cascade | 1,800 | Community | Groundwater |
| University of Providence | Cascade | 1,472 | 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, “Hilltop Colony, PWSID MT0004854, Montana”, https://aquacensus.com/water-systems/montana/hilltop-colony-mt0004854 (data as of October 1, 2026).