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Cascade Water Alliance plans switch to Tacoma supply; city briefed on long‑range pipeline costs and timeline
Summary
Issaquah’s mayor told the council that Cascade Water Alliance expects to enter a wholesale contract with Tacoma Public Utilities; the change shifts timing for a transmission main and delays the need for a Lake Tapps treatment plant into the 2060s, but carries an estimated $700 million transmission cost and other implementation steps.
The Issaquah mayor reported at the Jan. 7 council meeting that Cascade Water Alliance is prepared to enter a contract with Tacoma Public Utilities (TPU) after multiyear negotiations with both Seattle Public Utilities and Tacoma.
Under the proposed arrangement, Cascade would receive 15 million gallons per day immediately under a wholesale…
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