Concerning approval of certain alternative on-site sewage systems.

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S-1080.1

SENATE BILL 5635

State of Washington

69th Legislature

2025 Regular Session

By Senator Christian

AN ACT Relating to approval of certain alternative on-site sewage systems; amending RCW 70.05.074 ; amending 1997 c 447 s 1 (uncodified); and creating a new section.

BE IT ENACTED BY THE LEGISLATURE OF THE STATE OF WASHINGTON:

Sec. 1. 1997 c 447 s 1 (uncodified) is amended to read as follows:

The legislature finds that improperly designed, installed, or maintained on-site sewage disposal systems are a major contributor to water pollution in this state. The legislature also recognizes that evolving technology has produced many viable alternatives to traditional on-site septic systems. It is the purpose of this act to help facilitate the siting of new alternative on-site septic systems and to assist local governments in promoting efficient operation of on-site septic (( these )) systems.

Sec. 2. RCW 70.05.074 and 1997 c 447 s 2 are each amended to read as follows:

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PASSAGE PROBABILITY

13.7% Unlikely

Why this number

Stage base In Committee — base rate 41%, measured from WA's completed sessions
Momentum -5 27/100 from the pace of recorded action
Time since last action -22 272 days quiet

A transparent scoring model over stage, momentum, recency, sponsorship and recorded votes — not a trained predictor. Treat it as a way to rank attention, not as a forecast.