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Issaquah adopts updated sanitary sewer system plan, sets phased extension and capacity policies
Summary
The Issaquah City Council unanimously adopted a new sanitary sewer system plan that sets multi‑decade timelines for sewer extensions into environmentally sensitive areas, new developer contribution rules, and phased requirements for grease management and septic inspections.
The Issaquah City Council on May 19 unanimously adopted a revised sanitary sewer system plan that lays out capital projects, phased sewer‑extension timelines for unsewered neighborhoods near environmentally sensitive areas, and code changes to address septic systems, grinder pumps and fats, oils and grease (FOG) from commercial establishments.
The plan, presented by Matt Ellis, the city’s utility engineering manager, sets three tiers for sewer extension priorities — Tier 1 (100‑year floodplain, shoreline buffer, and commercial/industrial) with a 20‑year goal; Tier 2 (stream buffers, wetland boundaries, documented high groundwater) with a 30‑year goal; and Tier 3 (critical aquifer recharge areas and wellhead protection zones) with a 40‑year goal. The council adopted Resolution No. 2025‑11 to approve the plan.
Why it matters: the plan updates Issaquah’s infrastructure strategy, prioritizing sewer installation where failing septic systems would most likely harm…
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