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Public water system record

Cape San Juan Water District

Serves an area of San Juan County, WA · 164 people served

Federal records show 13 health-based violations and 6 monitoring/reporting issues for Cape San Juan Water District 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.

  • WA5311065
  • FRIDAY HARBOR
  • WA
  • 164 served

System profile

Source water Groundwater
ZIP 98250
EPA system ID WA5311065

Verify this system on EPA ECHO →

Health-based violations, last 10 years
13
Resolved
0
Unresolved
0
Archived by EPA
13
Any acute record
No
Monitoring issues, last 10 years
6

Key facts

  • Cape San Juan Water District draws water from 4 wells (1 of them for emergency, seasonal or other part-time use).
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 117.6 µg/L, federal limit 80 µg/L (1.5 times the limit), 2022.
  • Most recent formal enforcement: compliance order (no penalty) by Washington, July 2021.
  • Record on file since 1979, with 12 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 144 service lines.

Check whether Cape San Juan Water District serves your address

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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 86.63 µg/L, federal limit 80 µg/L (1.1 times the limit)
 220 Apr 1, 2024 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 82.4 µg/L, federal limit 80 µg/L (at or just above the limit)
 220 Oct 1, 2023 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 83.1 µg/L, federal limit 80 µg/L (at or just above the limit)
 220 Jul 1, 2023 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 104.6 µg/L, federal limit 80 µg/L (1.3 times the limit)
 220 Apr 1, 2023 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 101.8 µg/L, federal limit 80 µg/L (1.3 times the limit)
 220 Jan 1, 2023 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 117.6 µg/L, federal limit 80 µg/L (1.5 times the limit)
 220 Oct 1, 2022 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 107.6 µg/L, federal limit 80 µg/L (1.3 times the limit)
 220 Jul 1, 2022 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 87.8 µg/L, federal limit 80 µg/L (1.1 times the limit)
 220 Apr 1, 2022 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 87.8 µg/L, federal limit 80 µg/L (1.1 times the limit)
 220 Jan 1, 2022 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 99.7 µg/L, federal limit 80 µg/L (1.2 times the limit)
 220 Oct 1, 2021 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 110 µg/L, federal limit 80 µg/L (1.4 times the limit)
 220 Jul 1, 2021 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 112.8 µg/L, federal limit 80 µg/L (1.4 times the limit)
 220 Apr 1, 2021 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 85 µg/L, federal limit 80 µg/L (1.1 times the limit)
 220 Jan 1, 2021 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
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Oct 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
Haloacetic Acids (HAA5)
Monitoring and reporting
 Oct 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
Consumer Confidence Rule
OTHER
 Jul 1, 2024 Resolved
Haloacetic Acids (HAA5)
Monitoring and reporting
 Oct 1, 2022 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Oct 1, 2022 Resolved
Consumer Confidence Rule
OTHER
 Jul 1, 2017 Resolved

Full record since 1979

EPA's records for Cape San Juan Water District go back to 1979. Before October 19, 2016 they list 12 health-based violations (12 archived by EPA without a recorded fix) and 19 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1970s 0 9
1990s 11 9
2000s 1 0
2010 to October 18, 2016 0 1
October 19, 2016 to 2019 0 1
2020s 13 5

Most recent health-based violation before October 19, 2016: Total Coliform (acute), began December 2000, Archived.

Show all 12 health-based violations before October 19, 2016
Contaminant Start date Status
Total Coliform (acute)
Contaminant limit exceeded
 Dec 1, 2000 Archived
Total Coliform
Contaminant limit exceeded
 Sep 1, 1999 Archived
Total Coliform
Contaminant limit exceeded
 Jun 1, 1999 Archived
Total Coliform
Contaminant limit exceeded
 May 1, 1999 Archived
Total Coliform (acute)
Contaminant limit exceeded
 Oct 1, 1997 Archived
Total Coliform
Contaminant limit exceeded
 Jul 1, 1996 Archived
Total Coliform
Contaminant limit exceeded
 May 1, 1996 Archived
Total Coliform
Contaminant limit exceeded
 Oct 1, 1995 Archived
Total Coliform (acute)
Contaminant limit exceeded
 Mar 1, 1994 Archived
Total Coliform
Contaminant limit exceeded
 Nov 1, 1993 Archived
Total Coliform
Contaminant limit exceeded
 Feb 1, 1993 Archived
Total Coliform (acute)
Contaminant limit exceeded
 Nov 1, 1992 Archived

Enforcement actions

Washington regulators took 1 formal enforcement action against Cape San Juan Water District in 2021. The most recent was a compliance order (no penalty) in July 2021.

Date By Action Violations covered
Jul 14, 2021 Washington Compliance order (no penalty) 13 violations (13 health-based): Total Trihalomethanes (TTHMs)

What the violations mean

Total Trihalomethanes (TTHMs)

13 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Where the water comes from

Cape San Juan Water District draws water from 4 wells (1 of them for emergency, seasonal or other part-time use). It also has an emergency connection to Cattle Point Water District. 1 other public water system has an emergency connection to Cape San Juan Water District.

Emergency or part-time connections to

Annual water quality report

Cape San Juan Water District 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 Cape San Juan Water District 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