Water Supply Agreements

The Seattle wholesale agreement entitles Cascade to a specified amount of water each year for a fifty-year period ending December 31, 2063. The agreement extends current capacity of 33.3 mgd through 2039 and then ramps down throughout the remaining years.

Download the Seattle Wholesale Agreement

In March 2025, two new agreements were signed by Cascade and Tacoma Water (a division of Tacoma Public Utilities) to supply water to Cascade customers starting in 2041. The agreements start with a small amount of water being delivered by Tacoma Water in 2041, and the amount will steadily increase to 24 mgd by 2060. After 2062, Tacoma Water would be delivering about 12 mgd.

Currently, there is no infrastructure connecting the Tacoma and Cascade water systems. Under these agreements, Cascade will finance, construct, operate and maintain a water transmission main from Tacoma’s pipeline 5 to Cascade’s customers.

Download the Tacoma Wholesale Water Supply Agreement
Download the Tacoma Market-Priced Wholesale Water Supply Agreement