Public water system · ID1110030
ActiveTwenty Mile Creek Water Assn
At a glance
Twenty Mile Creek Water Assn (PWSID ID1110030) is an active community water system in Boundary County, Idaho. It reports serving 225 people through 89 service connections. Its primary water source is surface water, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in April 2024.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
225
Service connections
89
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Twenty Mile Creek Water Assn compare with other water systems in Boundary County?
By EPA's size categories, Twenty Mile Creek Water Assn is a very small system (500 people or fewer). Boundary County has 18 active public water systems. Its population served is about 64% below the county average of 633 people per system, and accounts for 2% of the 11,390 people reported by systems filed under the county. Across Idaho, the 1,961 active systems average 899 people each. Nationally, the average active community water system reports serving 6,703 people, so Twenty Mile Creek Water Assn 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. Idaho has 765 active community water systems, 39% of the state's 1,961 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 66 Idaho systems (3.4%) list surface water as their primary source.
Who owns and regulates Twenty Mile Creek Water Assn?
EPA lists Twenty Mile Creek Water Assn as privately owned. The ID state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 11 of the 18 active systems in Boundary County (61%) are also privately owned.
Does Twenty Mile Creek Water Assn have drinking water violations?
Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in April 2024. The violations listed here began between June 2000 and April 2024. By type: 5 contaminant level above the legal limit, 5 required treatment not met and 2 monitoring and reporting. The contaminant or rule involved most often is Interim Enhanced Surface Water Treatment Rule (4 of them). EPA lists 7 as resolved and 5 as archived. 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. 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.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2024-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2018-03-01 | Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 2017-03-01 | Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 2017-03-01 | Required treatment not metSingle Turbidity Exceed (Enhanced SWTR) · code 43 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 2016-03-01 | Required treatment not metMonthly Turbidity Exceed (Enhanced SWTR) · code 44 | Interim Enhanced Surface Water Treatment Rulecode 0300 | Yes | Resolved |
| 2007-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2007-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | Resolved |
| 2002-02-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 2002-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 2001-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 2000-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 2000-06-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Surface Water Treatment Rulecode 0200 | Yes | Archived |
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.
Twenty Mile Creek Water Assn: frequently asked questions
Who runs Twenty Mile Creek Water Assn?
Twenty Mile Creek Water Assn (PWSID ID1110030) is a community water system privately owned. It is regulated by the ID state drinking water program.
How many people does Twenty Mile Creek Water Assn serve?
Twenty Mile Creek Water Assn reports serving 225 people through 89 service connections in Boundary County, Idaho.
Where does Twenty Mile Creek Water Assn get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Twenty Mile Creek Water Assn have any drinking water violations?
Of the 12 most recent violations in EPA's records, 10 are health-based, and the most recent began in April 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 Twenty Mile Creek Water Assn'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, 10 are health-based, and the most recent began in April 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the ID state drinking water program.
Where can I find Twenty Mile Creek Water Assn's water quality report?
As a community water system, Twenty Mile Creek Water Assn 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 Boundary County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Bonners Ferry City of | Boundary | 3,367 | Community | Surface water |
| Three Mile Water Dist | Boundary | 2,458 | Community | Groundwater |
| Cabinet Mountains Water Dist | Boundary | 2,335 | Community | Groundwater |
| Moyie Springs City of | Boundary | 1,123 | Community | Groundwater |
| Bee Line Water Assn Inc. | Boundary | 533 | Community | Surface water |
| Mission Creek Water Assn | Boundary | 263 | 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, “Twenty Mile Creek Water Assn, PWSID ID1110030, Idaho”, https://aquacensus.com/water-systems/idaho/twenty-mile-creek-water-assn-id1110030 (data as of October 1, 2026).