SB 6291 — Concerning on-site wastewater treatment system inspections.

What this bill does

Increases the maximum period that a noncertified individual may review designs and conduct inspections of on-site wastewater treatment systems under the supervision of a certified individual from two years to four years.

From the Washington State Legislature's nonpartisan staff bill analysis. Read the full analysis ↗

Floor votes

• House — Final Passage as Amended by the House · March 3, 2026
  93 yea · 0 nay · 5 not voting
• Senate — 3rd Reading & Final Passage · February 10, 2026
  48 yea · 0 nay · 1 not voting
• Senate — Final Passage as Amended by the House · March 10, 2026
  49 yea · 0 nay

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