Water System Plan

In 2013-14, the Public Works Department produced and the Sequim City Council adopted its long-term planning strategy for the City’s water utility for the 6- and 20-year planning periods. Find it here: Resolution R2014-08 Water System Plan (PDF) (over 700 pages; very large file).

In 2021, Public Works commenced to update the 2013 plan in compliance with state Department of Health (DOH) regulations. The review process included SEPA and public hearings in July 2022 followed by approval from the Sequim Planning Commission and City Council in August 2022. Next came review by DOH and other state agencies as well as adjacent water purveyors, and local government consistency review by Clallam County. All comments have been addressed and the Final Plan was adopted by City Council September 11, 2023 and submitted to DOH for final approval. 

Reference and other related documents: 

Water System Functions

Water is handled through the Public Works Department. Over 800,000 gallons of potable water per day are typically provided to the residents and businesses of Sequim. Along with this water comes the maintenance and chlorination of approximately 72 miles of water line, three reservoirs that provide 2.4 million gallons of storage, and five water pumps for our three primary sources.

All state-mandated monitoring / state reports and all telemetry that help support the steady flow of water to the City of Sequim for potable uses, health, fire flow, and fire protection are completed at this level.

Recent Reports

Cross Connection Program

The purpose of the City of Sequim Cross Connection Program is to protect the city’s public water system from contamination through the elimination and control of actual or potential cross connections. The program's objective is to prevent "back-siphonage", i.e., any non-City water from entering the public water system. The plan is implemented in accordance with Sequim Municipal Code Chapter 13.120 including the Cross-Connection Control Manual adopted June 27, 2022.

All Premise Isolation DCVA must be installed as per City Standards.


If you do not already have them on file with the City, a copy of the tester's current BAT certification as well as Current Verification of accuracy for the test equipment used is needed.

Download the Backflow Prevention Assembly Test Report (PDF)

Please send Backflow Prevention Assembly Test/Air Gap Inspection Reports by email to Backflow


The city’s Water Fund includes the Operations and Maintenance Fund and the Capital Improvement Fund. The former includes divisions for administration, maintenance, plant operations, and capital outlay. It is funded primarily from user charges for the sale of water. The capital improvements that are expansion-only are supported by general facility fees charged for new connections to the water system. This fund’s primary purpose is to provide increased capacity to the water system due to growth.

Report an Issue 
If you have a sewer maintenance problem you’d like to report, please email the Public Works Department or call them at 360-683-5062 and include a description of the problem.