Public water system · MT0000582
ActiveAngel Island Subdivision
At a glance
Angel Island Subdivision (PWSID MT0000582) is an active community water system in Lincoln County, Montana. It reports serving 150 people through 184 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 11 violations for this system; none is health-based, and the most recent began in June 2003.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
150
Service connections
184
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Angel Island Subdivision compare with other water systems in Lincoln County?
By EPA's size categories, Angel Island Subdivision is a very small system (500 people or fewer). Lincoln County has 92 active public water systems. Its population served is about 29% below the county average of 212 people per system, and accounts for 0.8% of the 19,484 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 Angel Island 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 Angel Island Subdivision?
EPA lists Angel Island 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. 64 of the 92 active systems in Lincoln County (70%) are also privately owned.
Does Angel Island Subdivision have drinking water violations?
EPA's records list 11 violations for this system; none is health-based, and the most recent began in June 2003. The violations listed here began between June 1981 and June 2003. By type: 11 monitoring and reporting. The contaminant or rule involved most often is Nitrate (2 of them). EPA lists 8 as archived and 3 as resolved. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status. 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 |
|---|---|---|---|---|
| 2003-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1999-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Berylliumcode 1075 | No | Resolved |
| 1996-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1981-06-24 | Monitoring and reportingMonitoring, Regular · code 03 | Arseniccode 1005 | No | Archived |
| 1981-06-24 | Monitoring and reportingMonitoring, Regular · code 03 | Fluoridecode 1025 | No | Archived |
| 1981-06-24 | Monitoring and reportingMonitoring, Regular · code 03 | Cadmiumcode 1015 | No | Archived |
| 1981-06-24 | Monitoring and reportingMonitoring, Regular · code 03 | Chromiumcode 1020 | No | Archived |
| 1981-06-24 | Monitoring and reportingMonitoring, Regular · code 03 | Seleniumcode 1045 | No | Archived |
| 1981-06-24 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
| 1981-06-24 | Monitoring and reportingMonitoring, Regular · code 03 | Bariumcode 1010 | No | Archived |
| 1981-06-24 | Monitoring and reportingMonitoring, Regular · code 03 | Mercurycode 1035 | No | Archived |
All 11 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.
Angel Island Subdivision: frequently asked questions
Who runs Angel Island Subdivision?
Angel Island Subdivision (PWSID MT0000582) is a community water system privately owned. It is regulated by the MT state drinking water program.
How many people does Angel Island Subdivision serve?
Angel Island Subdivision reports serving 150 people through 184 service connections in Lincoln County, Montana.
Where does Angel Island 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 Angel Island Subdivision have any drinking water violations?
EPA's records list 11 violations for this system; none is health-based, and the most recent began in June 2003. 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 Angel Island 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 records list 11 violations for this system; none is health-based, and the most recent began in June 2003. For current results, consult the system's annual water quality report, EPA ECHO, or the MT state drinking water program.
Where can I find Angel Island Subdivision's water quality report?
As a community water system, Angel Island 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 Lincoln County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Libby City of | Lincoln | 4,892 | Community | Surface water |
| Troy City of | Lincoln | 2,100 | Community | Groundwater |
| Eureka Town of | Lincoln | 1,995 | Community | Surface water |
| Bears Country Store | Lincoln | 805 | Transient non-community | Groundwater |
| Fortine Mercantile | Lincoln | 504 | Transient non-community | Groundwater |
| Indian Springs Ranch Sub | Lincoln | 455 | Community | Groundwater |
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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, “Angel Island Subdivision, PWSID MT0000582, Montana”, https://aquacensus.com/water-systems/montana/angel-island-subdivision-mt0000582 (data as of October 1, 2026).