Public water system · MT0004529
ActiveHorizon Colony
At a glance
Horizon Colony (PWSID MT0004529) is an active community water system in Glacier County, Montana. It reports serving 150 people through 19 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 9 violations for this system; none is health-based, and the most recent began in January 2020.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
150
Service connections
19
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Horizon Colony compare with other water systems in Glacier County?
By EPA's size categories, Horizon Colony is a very small system (500 people or fewer). Glacier County has 27 active public water systems. Its population served is about 62% below the county average of 398 people per system, and accounts for 1.4% of the 10,757 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 Horizon 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 Horizon Colony?
EPA lists Horizon 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. 14 of the 27 active systems in Glacier County (52%) are also privately owned.
Does Horizon Colony have drinking water violations?
EPA's records list 9 violations for this system; none is health-based, and the most recent began in January 2020. The violations listed here began between August 2012 and January 2020. By type: 8 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminants or rules involved are Diquat, Glyphosate, Polychlorinated biphenyls (PCBs), total and 1,2-Dibromo-3-chloropropane (DBCP). EPA lists 9 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 |
|---|---|---|---|---|
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Diquatcode 2032 | No | Resolved |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Glyphosatecode 2034 | No | Resolved |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Polychlorinated biphenyls (PCBs), totalcode 2383 | No | Resolved |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dibromo-3-chloropropane (DBCP)code 2931 | No | Resolved |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Ethylene dibromide (EDB)code 2946 | No | Resolved |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Cyanidecode 1024 | No | Resolved |
| 2020-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Endothallcode 2033 | No | Resolved |
| 2013-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2012-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 9 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.
Horizon Colony: frequently asked questions
Who runs Horizon Colony?
Horizon Colony (PWSID MT0004529) is a community water system privately owned. It is regulated by the MT state drinking water program.
How many people does Horizon Colony serve?
Horizon Colony reports serving 150 people through 19 service connections in Glacier County, Montana.
Where does Horizon 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 Horizon Colony have any drinking water violations?
EPA's records list 9 violations for this system; none is health-based, and the most recent began in January 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 Horizon 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 9 violations for this system; none is health-based, and the most recent began in January 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 Horizon Colony's water quality report?
As a community water system, Horizon 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 Glacier County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Cut Bank City of | Glacier | 3,105 | Community | Surface water |
| St Mary Headquarters and Cg | Glacier | 1,030 | Community | Groundwater |
| Logan Pass Visitors Center | Glacier | 1,000 | Transient non-community | Surface water |
| St Mary Lodge and Resort | Glacier | 908 | Transient non-community | Groundwater |
| Glacier Park Inc. | Glacier | 765 | Transient non-community | Purchased surface water |
| Many Glacier Lodge Hotel | Glacier | 650 | Transient non-community | Groundwater |
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, “Horizon Colony, PWSID MT0004529, Montana”, https://aquacensus.com/water-systems/montana/horizon-colony-mt0004529 (data as of October 1, 2026).