Public water system · WA5374400

Active

Roslyn City of

At a glance

City of Roslyn (PWSID WA5374400) is an active community water system in Kittitas County, Washington. It reports serving 2,099 people through 710 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 11 violations for this system; 1 is health-based, and the most recent began in July 2025.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

2,099

Service connections

710

Primary source

Surface water

System type

CWS

Community water system

System record

PWSIDWA5374400

System typeCommunity water system

Activity statusActive

Population served2,099

Service connections710

Primary water sourceSurface water

Owner typeLocal government

Primacy agencyWA state drinking water program

City served—

StateWashington

ZIP—

CountyKittitas County

How does City of Roslyn compare with other water systems in Kittitas County?

By EPA's size categories, City of Roslyn is a small system (501 to 3,300 people). Kittitas County has 96 active public water systems. Its population served is about 4 times the county average of 528 people per system, and accounts for 4.1% 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 City of Roslyn 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 140 Washington systems (3%) list surface water as their primary source.

Who owns and regulates City of Roslyn?

EPA lists City of Roslyn 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. 10 of the 96 active systems in Kittitas County (10%) are also owned by a local government.

Does City of Roslyn have drinking water violations?

EPA's records list 11 violations for this system; 1 is health-based, and the most recent began in July 2025. The violations listed here began between October 1979 and July 2025. By type: 6 monitoring and reporting, 4 public notice, recordkeeping or other and 1 required treatment not met. The contaminant or rule involved most often is Consumer Confidence Rule (4 of them). EPA lists 9 as resolved and 2 as archived. 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. 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	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2018-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2017-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2015-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2014-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
2014-10-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2014-04-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Total trihalomethanes (TTHM)code 2950	No	Resolved
2014-04-01	Monitoring and reportingMonitoring and Reporting (DBP) · code 27	Haloacetic acids (HAA5)code 2456	No	Resolved
1992-02-01	Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24	Total coliform bacteria (TCR)code 3100	No	Archived
1992-01-01	Required treatment not metFailure to Filter (SWTR) · code 42	Surface Water Treatment Rulecode 0200	Yes	Resolved
1979-10-01	Monitoring and reportingMonitoring, Regular · code 03	Gross alpha (excluding radon and uranium)code 4000	No	Archived

All 11 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.

City of Roslyn: frequently asked questions

Who runs City of Roslyn?

City of Roslyn (PWSID WA5374400) is a community water system owned by a local government. It is regulated by the WA state drinking water program.

How many people does City of Roslyn serve?

City of Roslyn reports serving 2,099 people through 710 service connections in Kittitas County, Washington.

Where does City of Roslyn get its water?

EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.

Does City of Roslyn have any drinking water violations?

EPA's records list 11 violations for this system; 1 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 City of Roslyn'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 11 violations for this system; 1 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 City of Roslyn's water quality report?

As a community water system, City of Roslyn 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, “Roslyn City of, PWSID WA5374400, Washington”, https://aquacensus.com/water-systems/washington/roslyn-city-of-wa5374400 (data as of October 1, 2026).