Public water system · OR4190182
ActiveNps John Day Nm/Sheep Rock
At a glance
Nps John Day Nm/Sheep Rock (PWSID OR4190182) is an active transient non-community water system in Grant County, Oregon. It reports serving 115 people through 3 service connections. Its primary water source is groundwater, and EPA lists it as owned by the federal government. EPA's records list 7 violations for this system; none is health-based, and the most recent began in April 2021.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
115
Service connections
3
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Nps John Day Nm/Sheep Rock compare with other water systems in Grant County?
By EPA's size categories, Nps John Day Nm/Sheep Rock is a very small system (500 people or fewer). Grant County has 15 active public water systems. Its population served is about 66% below the county average of 339 people per system, and accounts for 2.3% of the 5,090 people reported by systems filed under the county. Across Oregon, the 2,536 active systems average 1,587 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Nps John Day Nm/Sheep Rock is about 20% below that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. Oregon has 1,250 active transient non-community water systems, 49% 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 Nps John Day Nm/Sheep Rock?
EPA lists Nps John Day Nm/Sheep Rock 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. 4 of the 15 active systems in Grant County (27%) are also owned by the federal government.
Does Nps John Day Nm/Sheep Rock have drinking water violations?
EPA's records list 7 violations for this system; none is health-based, and the most recent began in April 2021. The violations listed here began between April 2001 and April 2021. By type: 5 monitoring and reporting and 2 monitoring. The contaminant or rule involved most often is Nitrate (3 of them). EPA lists 7 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 |
|---|---|---|---|---|
| 2021-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2019-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2007-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2003-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2002-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2001-07-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2001-04-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
All 7 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.
Nps John Day Nm/Sheep Rock: frequently asked questions
Who runs Nps John Day Nm/Sheep Rock?
Nps John Day Nm/Sheep Rock (PWSID OR4190182) is a transient non-community water system owned by the federal government. It is regulated by the OR state drinking water program.
How many people does Nps John Day Nm/Sheep Rock serve?
Nps John Day Nm/Sheep Rock reports serving 115 people through 3 service connections in Grant County, Oregon.
Where does Nps John Day Nm/Sheep Rock 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 Nps John Day Nm/Sheep Rock have any drinking water violations?
EPA's records list 7 violations for this system; none is health-based, and the most recent began in April 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 Nps John Day Nm/Sheep Rock'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 7 violations for this system; none is health-based, and the most recent began in April 2021. For current results, consult EPA ECHO, or the OR state drinking water program.
Where can I find Nps John Day Nm/Sheep Rock's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Nps John Day Nm/Sheep Rock is a 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 Grant County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| John Day, City of | Grant | 1,617 | Community | Groundwater |
| Prairie City | Grant | 841 | Community | Groundwater under influence of surface water |
| Canyon City Water Department | Grant | 666 | Community | Groundwater under influence of surface water |
| Mount Vernon, City of | Grant | 510 | Community | Groundwater |
| Oprd Clyde Holliday Wayside | Grant | 450 | Transient non-community | Groundwater |
| Seneca, City of | Grant | 200 | 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, “Nps John Day Nm/Sheep Rock, PWSID OR4190182, Oregon”, https://aquacensus.com/water-systems/oregon/nps-john-day-nm-sheep-rock-or4190182 (data as of October 1, 2026).