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Public water system record

Seawest Water System

Serves an area of Island County, WA · 38 people served

Federal records show 3 health-based violations and 8 monitoring/reporting issues for Seawest Water System in the last ten years. The most serious issue in this window was a Total Trihalomethanes (TTHMs) violation that EPA lists as archived, not resolved.

  • WA5337544
  • MT VERNON
  • WA
  • 38 served

System profile

Source water Groundwater
ZIP 98273
EPA system ID WA5337544

Verify this system on EPA ECHO →

Health-based violations, last 10 years
3
Resolved
0
Unresolved
0
Archived by EPA
3
Any acute record
No
Monitoring issues, last 10 years
8

Key facts

  • Seawest Water System draws water from 2 wells.
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 112.6 µg/L, federal limit 80 µg/L (1.4 times the limit), 2025.
  • Most recent formal enforcement: compliance order (no penalty) by Washington, August 2025.
  • Record on file since 2008, with 0 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 24 unknown out of 24 service lines.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 98 µg/L, federal limit 80 µg/L (1.2 times the limit)
 220 Oct 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 96.85 µg/L, federal limit 80 µg/L (1.2 times the limit)
 220 Jul 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 112.6 µg/L, federal limit 80 µg/L (1.4 times the limit)
 220 Apr 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
Haloacetic Acids (HAA5)
Monitoring and reporting
 Jan 1, 2025 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Jan 1, 2025 Resolved
Haloacetic Acids (HAA5)
Monitoring and reporting
 Oct 1, 2024 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Oct 1, 2024 Resolved
Nitrate
Monitoring and reporting
 Jan 1, 2023 Resolved
Nitrate
Monitoring and reporting
 Jan 1, 2022 Resolved
Lead and Copper Rule
Monitoring and reporting
 Jan 1, 2020 Resolved
Lead and Copper Rule
Monitoring and reporting
 Jan 1, 2019 Resolved

Full record since 2008

EPA's records for Seawest Water System go back to 2008. Before October 19, 2016 they list no health-based violations and 20 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
2000s 0 20
October 19, 2016 to 2019 0 1
2020s 3 7

Enforcement actions

Washington regulators took 2 formal enforcement actions against Seawest Water System between 2024 and 2025. The most recent was a compliance order (no penalty) in August 2025.

Date By Action Violations covered
Aug 22, 2025 Washington Compliance order (no penalty) 3 violations (3 health-based): Total Trihalomethanes (TTHMs)
May 24, 2024 Washington Compliance order (no penalty) 2 violations: Nitrate

What the violations mean

Total Trihalomethanes (TTHMs)

3 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Where the water comes from

Seawest Water System draws water from 2 wells.

Annual water quality report

Seawest Water System must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Seawest Water System for a copy.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Washington.

Certified drinking water labs by state EPA guidance for private wells