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Shelton updates council on water and wastewater projects including peracetic‑acid backup design and storage plans
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Summary
City Public Works staff on July 22 told the Shelton City Council that several water and wastewater infrastructure projects—including a peracetic‑acid backup disinfection design and reservoir planning—are at or near design and pending funding and permitting.
City Public Works staff on July 22 told the Shelton City Council that several water and wastewater infrastructure projects are moving through design and permitting and that funding remains the primary implementation challenge.
Parametrix completed design for emergency backup disinfection at the wastewater treatment plant using peracetic acid, staff said. The measure is intended to provide an alternative disinfection method if the plant’s ultraviolet (UV) system fails during an event. Public Works staff said they are discussing acceptance of the design with the Washington State Department of Ecology and that implementing the system will require identifying construction funding.
Why it matters: staff said backup disinfection protects downstream shellfish beds, supports public‑health compliance and could reduce closures tied to treatment interruptions. Staff noted interest from oyster farmers and state agencies on the backup design and that the system would help reduce the risk of closures related to discharge issues.
Inflow and infiltration (I&I) and storage projects: staff reported ongoing work to reduce groundwater and stormwater entering the sewer system. A “slack” storage tank and other redundancies already added to the system were credited with helping during past heavy rain events; staff said smoke testing and design to address I&I are scheduled for design and later construction. The project to increase storage and reduce peak discharges remains on the city’s capital improvement program for design in 2026 or 2027 depending on budget.
Angleside pressure zone and reservoirs: staff described a multi‑element solution for the Angleside pressure zone that includes a booster pump station to maintain pressure during fire events and an eventual upper reservoir to provide additional gravity storage. The booster station design was nearing completion and staff said they expected to advertise for bids in the fall. Staff said the booster will allow more use of the existing reservoir during events and support future growth while telemetry and set points coordinate pumps between stations.
Mountain View reservoir grant: staff said the state legislature awarded $550,000 for design of a Mountain View reservoir; staff described that grant as funding design work for a roughly 1.5–2.0 million gallon tank in Mountain View. Staff presented renderings of a proposed bolted steel tank for an upper reservoir and said the structure would increase storage for drinking water and fire suppression.
Costs, permitting and environmental work: wastewater storage and tank projects will require permitting (staff cited SEPA, fish and wildlife coordination, and work with the Department of Health and the U.S. Army Corps of Engineers where applicable). Staff noted environmental mitigation steps already taken on one reservoir project area to create replacement habitat for a local pocket‑gopher habitat and said they completed restoration work to satisfy regulators before moving into construction bidding.
Next steps and funding: for the wastewater backup system, staff said design is complete and they are negotiating Ecology acceptance; they still must identify construction funds. For Angleside booster/reservoir work staff expect final design soon, then a bid package this fall; Mountain View reservoir design is funded by the $550,000 legislative award. No formal contract awards or budget appropriations were approved at the study session.
