Public water system · ID2290026
ActiveOnaway Water and Sewer Assn
At a glance
Onaway Water and Sewer Assn (PWSID ID2290026) is an active community water system in Latah County, Idaho. It reports serving 200 people through 100 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in July 2025.
This page covers its drinking water system only; sewer and wastewater service are not part of EPA's drinking water records.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
200
Service connections
100
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Onaway Water and Sewer Assn compare with other water systems in Latah County?
By EPA's size categories, Onaway Water and Sewer Assn is a very small system (500 people or fewer). Latah County has 29 active public water systems. Its population served is well below the county average of 1,403 people per system, and accounts for 0.5% of the 40,673 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 Onaway Water and Sewer 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. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,861 Idaho systems (95%) list groundwater as their primary source.
Who owns and regulates Onaway Water and Sewer Assn?
EPA lists Onaway Water and Sewer 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. 14 of the 29 active systems in Latah County (48%) are also privately owned.
Does Onaway Water and Sewer Assn have drinking water violations?
EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in July 2025. The violations listed here began between November 1991 and July 2025. By type: 5 monitoring and reporting, 4 contaminant level above the legal limit and 1 monitoring. The contaminant or rule involved most often is Total coliform bacteria (TCR) (6 of them). EPA lists 4 as resolved, 4 as archived and 2 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-07-08 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Unaddressed |
| 2024-10-07 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 2017-06-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2016-12-30 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Unaddressed |
| 2015-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2014-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2002-05-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 2000-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1995-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1991-11-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
All 10 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.
Onaway Water and Sewer Assn: frequently asked questions
Who runs Onaway Water and Sewer Assn?
Onaway Water and Sewer Assn (PWSID ID2290026) is a community water system privately owned. It is regulated by the ID state drinking water program.
How many people does Onaway Water and Sewer Assn serve?
Onaway Water and Sewer Assn reports serving 200 people through 100 service connections in Latah County, Idaho.
Where does Onaway Water and Sewer Assn 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 Onaway Water and Sewer Assn have any drinking water violations?
EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in July 2025. 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 Onaway Water and Sewer 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. EPA's records list 10 violations for this system; 4 are health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the ID state drinking water program.
Where can I find Onaway Water and Sewer Assn's water quality report?
As a community water system, Onaway Water and Sewer 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 Latah County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Moscow Water Dept | Latah | 26,000 | Community | Groundwater |
| University of Idaho | Latah | 8,589 | Community | Groundwater |
| Genesee City of | Latah | 1,044 | Community | Groundwater |
| Troy City of | Latah | 850 | Community | Surface water |
| Potlatch City of | Latah | 812 | Community | Groundwater |
| Juliaetta City of | Latah | 624 | 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, “Onaway Water and Sewer Assn, PWSID ID2290026, Idaho”, https://aquacensus.com/water-systems/idaho/onaway-water-and-sewer-assn-id2290026 (data as of October 1, 2026).