Public water system · OR4101420
ActiveWallowa Lake Co Service Dist
At a glance
Wallowa Lake Co Service Dist (PWSID OR4101420) is an active community water system in Wallowa County, Oregon. It reports serving 350 people through 288 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
350
Service connections
288
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Wallowa Lake Co Service Dist compare with other water systems in Wallowa County?
By EPA's size categories, Wallowa Lake Co Service Dist is a very small system (500 people or fewer). Wallowa County has 9 active public water systems, and Wallowa Lake Co Service Dist is the 4th-largest of them by population served. Its population served is about 41% below the county average of 595 people per system, and accounts for 6.5% of the 5,359 people reported by systems filed under the county. Across Oregon, the 2,536 active systems average 1,587 people each. Nationally, the average active community water system reports serving 6,703 people, so Wallowa Lake Co Service Dist 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. Oregon has 940 active community water systems, 37% of the state's 2,536 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,175 Oregon systems (86%) list groundwater as their primary source.
Who owns and regulates Wallowa Lake Co Service Dist?
EPA lists Wallowa Lake Co Service Dist as owned by a local government. The OR state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 5 of the 9 active systems in Wallowa County (56%) are also owned by a local government.
Does Wallowa Lake Co Service Dist have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2025. The violations listed here began between January 2018 and October 2025. By type: 7 monitoring and 5 monitoring and reporting. The contaminant or rule involved most often is Revised Total Coliform Rule (7 of them). 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 |
|---|---|---|---|---|
| 2025-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2025-09-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2024-12-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2024-07-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2024-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2023-12-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2023-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2023-08-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2023-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2019-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2018-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | 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.
Wallowa Lake Co Service Dist: frequently asked questions
Who runs Wallowa Lake Co Service Dist?
Wallowa Lake Co Service Dist (PWSID OR4101420) is a community water system owned by a local government. It is regulated by the OR state drinking water program.
How many people does Wallowa Lake Co Service Dist serve?
Wallowa Lake Co Service Dist reports serving 350 people through 288 service connections in Wallowa County, Oregon.
Where does Wallowa Lake Co Service Dist 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 Wallowa Lake Co Service Dist 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 October 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 Wallowa Lake Co Service Dist'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 October 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the OR state drinking water program.
Where can I find Wallowa Lake Co Service Dist's water quality report?
As a community water system, Wallowa Lake Co Service Dist 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 Wallowa County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Enterprise, City of | Wallowa | 2,107 | Community | Groundwater |
| Joseph, City of | Wallowa | 1,182 | Community | Surface water |
| Wallowa, City of | Wallowa | 840 | Community | Groundwater |
| Lostine, City of | Wallowa | 350 | Community | Groundwater |
| Wallowa Lake Tramway | Wallowa | 300 | Transient non-community | Groundwater |
| Lakeshore Wtr & Develop Co-Op | Wallowa | 165 | Transient non-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, “Wallowa Lake Co Service Dist, PWSID OR4101420, Oregon”, https://aquacensus.com/water-systems/oregon/wallowa-lake-co-service-dist-or4101420 (data as of October 1, 2026).