Public water system · WA53AB326
ActiveMountain Ridge
At a glance
Mountain Ridge (PWSID WA53AB326) is an active community water system in Kittitas County, Washington. It reports serving 28 people through 21 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list one violation for this system; it is health-based, and the most recent began in July 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
28
Service connections
21
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Mountain Ridge compare with other water systems in Kittitas County?
By EPA's size categories, Mountain Ridge is a very small system (500 people or fewer). Kittitas County has 96 active public water systems. Its population served is well below the county average of 528 people per system, and accounts for less than 0.1% of the 50,703 people reported by systems filed under the county. Across Washington, the 4,705 active systems average 2,172 people each. Nationally, the average active community water system reports serving 6,703 people, so Mountain Ridge 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. Washington has 2,392 active community water systems, 51% 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 Mountain Ridge?
EPA lists Mountain Ridge as privately owned. 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. 72 of the 96 active systems in Kittitas County (75%) are also privately owned.
Does Mountain Ridge have drinking water violations?
EPA's records list one violation for this system; it is health-based, and the most recent began in July 2025. By type: 1 contaminant level above the legal limit. The contaminant or rule involved is Total trihalomethanes (TTHM). 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 |
|---|---|---|---|---|
| 2025-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Total trihalomethanes (TTHM)code 2950 | Yes | 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.
Mountain Ridge: frequently asked questions
Who runs Mountain Ridge?
Mountain Ridge (PWSID WA53AB326) is a community water system privately owned. It is regulated by the WA state drinking water program.
How many people does Mountain Ridge serve?
Mountain Ridge reports serving 28 people through 21 service connections in Kittitas County, Washington.
Where does Mountain Ridge 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 Mountain Ridge have any drinking water violations?
EPA's records list one violation for this system; it is 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 Mountain Ridge'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 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 WA state drinking water program.
Where can I find Mountain Ridge's water quality report?
As a community water system, Mountain Ridge 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 Kittitas County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Ellensburg Water Dept | Kittitas | 20,900 | Community | Groundwater |
| Indian John Rest Area (Eb/Wb) | Kittitas | 5,718 | Transient non-community | Groundwater |
| Suncadia Resort | Kittitas | 2,640 | Community | Purchased surface water |
| Wanapum State Park | Kittitas | 2,263 | Transient non-community | Groundwater |
| Kittitas City of | Kittitas | 2,247 | Community | Groundwater |
| Cle Elum Water Department | Kittitas | 2,213 | Community | Surface water |
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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, “Mountain Ridge, PWSID WA53AB326, Washington”, https://aquacensus.com/water-systems/washington/mountain-ridge-wa53ab326 (data as of October 1, 2026).