Public water system · OR4194203
ActiveUsace John Day Dam
At a glance
Usace John Day Dam (PWSID OR4194203) is an active non-transient non-community water system in Sherman County, Oregon. It reports serving 120 people through 5 service connections. Its primary water source is groundwater, and EPA lists it as owned by the federal government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in June 2021.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
120
Service connections
5
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Usace John Day Dam compare with other water systems in Sherman County?
By EPA's size categories, Usace John Day Dam is a very small system (500 people or fewer). Sherman County has 12 active public water systems. Its population served is about 61% below the county average of 309 people per system, and accounts for 3.2% of the 3,709 people reported by systems filed under the county. Across Oregon, the 2,536 active systems average 1,587 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Usace John Day Dam is well below that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Oregon has 346 active non-transient non-community water systems, 14% 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 Usace John Day Dam?
EPA lists Usace John Day Dam as owned by the federal 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. 3 of the 12 active systems in Sherman County (25%) are also owned by the federal government.
Does Usace John Day Dam have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in June 2021. The violations listed here began between January 2008 and June 2021. By type: 8 monitoring and reporting and 4 monitoring. The contaminant or rule involved most often is Revised Total Coliform Rule (4 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 |
|---|---|---|---|---|
| 2021-06-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2020-07-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2018-11-01 | MonitoringMonitoring, Additional Routine (RTCR) · code 3B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2018-10-23 | Monitoring and reportingMonitoring, Source Water (GWR) · code 34 | E. colicode 3014 | No | Resolved |
| 2018-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2016-08-01 | MonitoringMonitoring, Additional Routine (RTCR) · code 3B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2014-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2014-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2012-04-01 | Monitoring and reportingMonitoring, Repeat Minor (TCR) · code 26 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2008-10-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2008-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2008-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | 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.
Usace John Day Dam: frequently asked questions
Who runs Usace John Day Dam?
Usace John Day Dam (PWSID OR4194203) is a non-transient non-community water system owned by the federal government. It is regulated by the OR state drinking water program.
How many people does Usace John Day Dam serve?
Usace John Day Dam reports serving 120 people through 5 service connections in Sherman County, Oregon.
Where does Usace John Day Dam 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 Usace John Day Dam 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 June 2021. 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 Usace John Day Dam'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 June 2021. For current results, consult EPA ECHO, or the OR state drinking water program.
Where can I find Usace John Day Dam's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Usace John Day Dam is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Sherman County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Biggs Service District | Sherman | 1,600 | Non-transient non-community | Groundwater |
| Wasco, City of | Sherman | 460 | Community | Groundwater |
| Moro, City of | Sherman | 350 | Community | Groundwater |
| Rufus Public Works | Sherman | 270 | Community | Groundwater |
| Sherman County School | Sherman | 240 | Non-transient non-community | Groundwater |
| Oprd Deschutes River Rec Area | Sherman | 200 | Transient non-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, “Usace John Day Dam, PWSID OR4194203, Oregon”, https://aquacensus.com/water-systems/oregon/usace-john-day-dam-or4194203 (data as of October 1, 2026).