Public water system · WA5329078
ActiveWanapum Maintenance Center
At a glance
Wanapum Maintenance Center (PWSID WA5329078) is an active non-transient non-community water system in Grant County, Washington. It reports serving 70 people through 5 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
70
Service connections
5
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Wanapum Maintenance Center compare with other water systems in Grant County?
By EPA's size categories, Wanapum Maintenance Center is a very small system (500 people or fewer). Grant County has 265 active public water systems. Its population served is well below the county average of 543 people per system, and accounts for less than 0.1% of the 143,944 people reported by systems filed under the county. Across Washington, the 4,705 active systems average 2,172 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Wanapum Maintenance Center 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. Washington has 400 active non-transient non-community water systems, 8.5% of the state's 4,705 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 4,370 Washington systems (93%) list groundwater as their primary source.
Who owns and regulates Wanapum Maintenance Center?
EPA lists Wanapum Maintenance Center as owned by a local government. The WA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 26 of the 265 active systems in Grant County (9.8%) are also owned by a local government.
Does Wanapum Maintenance Center have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in January 2025. By type: 1 monitoring and reporting. The contaminant or rule involved is Nitrate. EPA lists 1 as archived. 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 |
|---|---|---|---|---|
| 2025-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
The one violation in EPA's records.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.
Wanapum Maintenance Center: frequently asked questions
Who runs Wanapum Maintenance Center?
Wanapum Maintenance Center (PWSID WA5329078) is a non-transient non-community water system owned by a local government. It is regulated by the WA state drinking water program.
How many people does Wanapum Maintenance Center serve?
Wanapum Maintenance Center reports serving 70 people through 5 service connections in Grant County, Washington.
Where does Wanapum Maintenance Center 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 Wanapum Maintenance Center have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in January 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 Wanapum Maintenance Center'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 one violation for this system; it is not health-based, and the most recent began in January 2025. For current results, consult EPA ECHO, or the WA state drinking water program.
Where can I find Wanapum Maintenance Center's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Wanapum Maintenance Center 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 Grant County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Moses Lake City of | Grant | 32,428 | Community | Groundwater |
| Gorge Amphitheatre | Grant | 25,119 | Transient non-community | Groundwater |
| Ephrata Water Department | Grant | 8,718 | Community | Groundwater |
| Quincy Water Department City of | Grant | 8,415 | Community | Groundwater |
| Mattawa City of | Grant | 5,370 | Community | Groundwater |
| Sun Lakes State Park | Grant | 4,858 | 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, “Wanapum Maintenance Center, PWSID WA5329078, Washington”, https://aquacensus.com/water-systems/washington/wanapum-maintenance-center-wa5329078 (data as of October 1, 2026).