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Public water system record

Issaquah Water System

Serves Issaquah, King County, WA · 43,584 people served

Federal records show no health-based violations and no monitoring or reporting issues for Issaquah Water System in the last ten years.

  • WA5336350
  • ISSAQUAH
  • WA
  • 43,584 served

System profile

Source water Purchased surface water
ZIP 98027
EPA system ID WA5336350

Verify this system on EPA ECHO →

Health-based violations, last 10 years
0
Resolved
0
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
0

Key facts

  • Issaquah Water System draws water from 4 wells (1 of them for emergency, seasonal or other part-time use).
  • Record on file since 1979, with 4 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 9,402 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.

None since October 2016, and no monitoring or reporting violations either.

Full record since 1979

EPA's records for Issaquah Water System go back to 1979. Before October 19, 2016 they list 4 health-based violations (4 archived by EPA without a recorded fix) and 168 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1970s 0 1
1990s 1 1
2000s 3 165
2010 to October 18, 2016 0 1

Most recent health-based violation before October 19, 2016: Total Coliform, began November 2003, Archived.

Show all 4 health-based violations before October 19, 2016
Contaminant Start date Status
Total Coliform
Contaminant limit exceeded
 Nov 1, 2003 Archived
Total Coliform
Contaminant limit exceeded
 Dec 1, 2000 Archived
Total Coliform
Contaminant limit exceeded
 Nov 1, 2000 Archived
Total Coliform
Contaminant limit exceeded
 Aug 1, 1994 Archived

Where the water comes from

Issaquah Water System draws water from 4 wells (1 of them for emergency, seasonal or other part-time use). It also buys water from City of Bellevue and System WA53AA374. It also has an emergency connection to Sammamish Plateau Water & Sewer. 1 other public water system has an emergency connection to Issaquah Water System.

Buys water from

Emergency or part-time connections to

Annual water quality report

Issaquah 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 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.

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