That framing is sharper than most of what gets posted on land strategy. Utility district capital improvement plans, often called CIPs, are public documents that lay out exactly what a district intends to build, when, and with what funding. A funded extension with a bid date is a concrete near-term signal. A "future service area" designation on a district map is a wish, and those maps can sit unchanged for a decade.
One thing worth layering in: water and sewer extensions often move on different schedules from the same district, and a parcel sometimes sits in one district for water and a different one for sewer. If both services need to reach a parcel before it can be developed to the use you are counting on, you want CIP coverage for both, not just one. I would confirm with each district separately rather than assuming the same timeline applies.
Also worth a look at whether the county has an adopted comprehensive plan amendment cycle. In Washington State, counties under the Growth Management Act update their urban growth boundaries on a periodic schedule, and utility extension funding sometimes moves in coordination with those boundary decisions rather than independently. The two signals together, funded CIP plus a boundary review window, tend to mean something more than either one alone. I am not certain how Snohomish County currently stages those reviews, so I would verify directly with the county planning department.
This is the kind of methodology question the Land Banking guide in the strategy section touches on from a high level, though it does not go into county-specific research depth.
Are you tracking CIP documents directly from the district websites, or do you have a better source for Snohomish specifically?
