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Community Water System · PWS WA5368790

Port of Allyn

Shelton, Washington 98584-5034 - drinking water served from groundwater sources to 397 people, tracked in EPA SDWIS and UCMR5.

397
People served
14
EPA violations
2
Health-based
Untested
UCMR5 result

The verdict

EPA records 14 drinking-water violations at Port of Allyn, 14% of them health-based - below the Washington per-system average.

14
Total EPA violations on record
14%
Health-based (MCL / treatment failure)
397
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Port of Allyn

Port of Allyn is a local-owned community water system that delivers drinking water to 397 residents in Shelton, Washington (Mason County) through 78 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 14 total violations for this system , of which 2 (14%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 8 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Revised Total Coliform Rule, recorded in 3 violations (MON). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Washington, EPA tracks 4,557 public water systems serving 9,736,844 people, with 314,648 cumulative violations and 20,590 health-based violations on record. About 92% of systems in the state carry at least one violation, and state-wide the average per system is 69 violations. Statewide, 98 of 247 UCMR5-tested systems have reported PFAS detections (39.7%).

Port of Allyn's 14 violations sit below the Washington average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
397
Total Violations
14
Health-Based Violations
2
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
78
County
Mason
School/Daycare
No
MCL Violations
2
Monitoring Violations
8
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Revised Total Coliform Rule MON 3 2023
Nitrate MR 2 2003
Coliform (TCR) MR 2 2012
Coliform (TCR) MCL 2 2006
Consumer Confidence Rule Other 1 2024
Lead and Copper Rule MR 1 2023

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Port of Allyn.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID WA5368790 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Washington Drinking Water Authority

Washington State Department of Health, Office of Drinking Water is the primacy agency that licenses and inspects Port of Allyn under EPA-delegated authority.

Open WA regulator portal

Source: Washington State Department of Health, Office of Drinking Water

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2024 Consumer Confidence Rule Other 1 SDWIS / WA5368790 / 7000
2023 Revised Total Coliform Rule MON 3 SDWIS / WA5368790 / 8000
2023 Lead and Copper Rule MR 1 SDWIS / WA5368790 / 5000
2012 Coliform (TCR) MR 2 SDWIS / WA5368790 / 3100
2006 Coliform (TCR) MCL 2 SDWIS / WA5368790 / 3100
2003 Nitrate MR 2 SDWIS / WA5368790 / 1040

How Port of Allyn Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Port of Allyn Washington avg Federal benchmark
Total violations 14 69 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 2 4.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 39.7% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 397 2,137 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 4,557 regulated public water systems in Washington.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Port of Allyn water safe to drink? ▼
Port of Allyn (PWS ID: WA5368790) has 14 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 397 people using Groundwater sources.
How many people does Port of Allyn serve? ▼
Port of Allyn serves 397 people in Shelton, Washington. It is a Local-owned system using Groundwater water sources with 78 service connections.
What type of violations does Port of Allyn have? ▼
Port of Allyn has 14 total violations: 2 health-based violations (MCL exceedances or treatment failures), 8 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Port of Allyn water? ▼
No PFAS testing data is available for Port of Allyn under the EPA's UCMR5 monitoring program.
What water source does Port of Allyn use? ▼
Port of Allyn uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.