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Public water system record

Sammamish Plateau Water & Sewer

Serves Sammamish, Union Hill-Novelty Hill and Issaquah, King County, WA · 79,362 people served

Federal records show no health-based violations and no monitoring or reporting issues for Sammamish Plateau Water & Sewer in the last ten years.

  • WA5340900
  • SAMMAMISH
  • WA
  • 79,362 served

System profile

Source water Purchased surface water
ZIP 98075
EPA system ID WA5340900

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

  • Sammamish Plateau Water & Sewer draws water from 12 wells (1 of them for emergency, seasonal or other part-time use).
  • Record on file since 1979, with 3 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 17,213 unknown out of 36,913 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 Sammamish Plateau Water & Sewer go back to 1979. Before October 19, 2016 they list 3 health-based violations (3 archived by EPA without a recorded fix) and 50 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1970s 0 1
1990s 1 5
2000s 2 44

Most recent health-based violation before October 19, 2016: Total Coliform, began January 2004, Archived.

Show all 3 health-based violations before October 19, 2016
Contaminant Start date Status
Total Coliform
Contaminant limit exceeded
 Jan 1, 2004 Archived
Total Coliform
Contaminant limit exceeded
 Aug 1, 2000 Archived
Total Coliform
Contaminant limit exceeded
 Jun 1, 1992 Archived

Where the water comes from

Sammamish Plateau Water & Sewer draws water from 12 wells (1 of them for emergency, seasonal or other part-time use). It also buys water from System WA53AA374 and NE Sammamish Sewer & Water District. It also has emergency connections to Issaquah Water System, Union Hill Water Association Inc and Ames Lake Water Assoc Inc. 1 other community water system buys water from Sammamish Plateau Water & Sewer. 4 other public water systems have emergency connections to Sammamish Plateau Water & Sewer.

Buys water from

Emergency or part-time connections to

Community systems that buy water from it

Annual water quality report

Sammamish Plateau Water & Sewer 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