2026 Water System Improvement
Project Status
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Project Details/Neighborhood
- 5200 block of 82nd Avenue SE
- 5200 block of Forest Avenue SE
- West Mercer Place
Background
Providing safe and reliable drinking water for the community is a top priority for the City of Mercer Island and the Public Works Department. The 2022 Water System Plan Update establishes the following goals:
- Preserve public health and safety,
- Maintain adequate water volume for firefighting,
- Maintain adequate water volume for basic sanitation and
- Maintain consumptive value and water quality.
The City’s water distribution system includes more than 113 miles of water mains of varying age, size, material, and condition. Most of the system is composed of cast iron and ductile iron pipe. Some of the older cast iron piping is brittle, undersized, and known for developing leaks and breaks as it nears the latter part of its expected life. Cast iron pipe in the Mercer Island water system was primarily installed in the late 1950s and early 1960s, making it some of the oldest piping within the distribution system
Description
Improving and renewing the water system is necessary to prevent unexpected system breakdowns and expensive emergency repairs. Taking a proactive approach to renew critical components such as water mains will strengthen the system's reliability in serving its customers. This project furthers goals outlined in the City's Water System Plan (2015), ensuring necessary improvements so the City remains at the forefront in providing high-quality water service to its current and future customers.
This project will replace roughly 1,625 linear feet of 4-inch, 6-inch, and 8-inch cast iron water mains with 6-inch and 8-inch ductile iron water mains at the following locations: 5200 block of 82nd Avenue SE; 5200 block of Forest Avenue SE; and the entirety of West Mercer Place. Fire hydrants, water services, one PRV station and other water system components will be upgraded/replaced as part of the project.
Project Timeline
- Design - April 2026 - December 2026
- Construction - January 2027 - June 2027
Estimated Budget
- Design: $125,555.00
- Construction: $2,000,000.00 (Estimated)
Contact
Zechariah Rodino, P.E., Utilities Engineer
zechariah.rodino@mercerisland.gov; 206-858-2187
Status Updates