Public water system · WA5368790

Active

Port of Allyn

At a glance

Port of Allyn (PWSID WA5368790) is an active community water system in Mason County, Washington. It reports serving 397 people through 78 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 10 violations for this system; 2 are health-based, and the most recent began in July 2024.

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

Population served

397

Service connections

Primary source

Groundwater

System type

CWS

Community water system

System record

PWSIDWA5368790

System typeCommunity water system

Activity statusActive

Population served397

Service connections78

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyWA state drinking water program

City served—

StateWashington

ZIP—

CountyMason County

How does Port of Allyn compare with other water systems in Mason County?

By EPA's size categories, Port of Allyn is a very small system (500 people or fewer). Mason County has 240 active public water systems. Its population served is about 26% above the county average of 315 people per system, and accounts for 0.5% of the 75,633 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 Port of Allyn 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 Port of Allyn?

EPA lists Port of Allyn 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. 64 of the 240 active systems in Mason County (27%) are also owned by a local government.

Does Port of Allyn have drinking water violations?

EPA's records list 10 violations for this system; 2 are health-based, and the most recent began in July 2024. The violations listed here began between February 1992 and July 2024. By type: 4 monitoring and reporting, 3 monitoring, 2 contaminant level above the legal limit and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 7 as resolved and 3 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
2024-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2023-12-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2023-07-01	Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51	Lead and Copper Rulecode 5000	No	Resolved
2022-07-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2020-05-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2012-05-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2006-08-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Archived
2006-07-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Archived
2003-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
1992-02-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Archived

All 10 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.

Port of Allyn: frequently asked questions

Who runs Port of Allyn?

Port of Allyn (PWSID WA5368790) is a community water system owned by a local government. It is regulated by the WA state drinking water program.

How many people does Port of Allyn serve?

Port of Allyn reports serving 397 people through 78 service connections in Mason County, Washington.

Where does Port of Allyn 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 Port of Allyn have any drinking water violations?

EPA's records list 10 violations for this system; 2 are health-based, and the most recent began in July 2024. 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 Port of Allyn'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 10 violations for this system; 2 are health-based, and the most recent began in July 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the WA state drinking water program.

Where can I find Port of Allyn's water quality report?

As a community water system, Port of Allyn 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 Mason County

Water system	County	Population served	Type	Source
Shelton City of	Mason	15,089	Community	Groundwater
Belfair Water District 1	Mason	4,432	Community	Groundwater
Lake Cushman System 5	Mason	3,675	Community	Groundwater
Twanoh State Park	Mason	3,173	Transient non-community	Groundwater
Belfair State Park	Mason	2,411	Transient non-community	Groundwater
Timberlake Community Club Inc.	Mason	2,337	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, “Port of Allyn, PWSID WA5368790, Washington”, https://aquacensus.com/water-systems/washington/port-of-allyn-wa5368790 (data as of October 1, 2026).