SB6291 • 2026

On-site wastewater systems

Concerning on-site wastewater treatment system inspections.

Energy Technology

Passed Legislature

This bill passed both chambers and reached final enrollment, even if later executive action is not shown here.

Sponsor: Senator Lovelett, Senator Shewmake
Last action: 2026-03-24
Official status: C 210 L 26
Effective date: Not listed

Plain English Breakdown

Using official source text because the generated explanation was unavailable or could not be confirmed against the official bill text.

On-site wastewater systems

What This Bill Does

On-site wastewater systems

Limits and Unknowns

This entry is temporarily using official source text because the generated explanation could not be confirmed against the official bill text during the last sync.

Amendments

These notes stay tied to the official amendment files and metadata from the legislature.

6291 AMH ENVI H3626.1

0 • Environment & Energy

ADOPTED

Plain English: 6291 AMH ENVI H3626.1 SB 6291 - H COMM AMD By Committee on Environment & Energy ADOPTED 03/03/2026 Strike everything after the enacting clause and insert the 1 following: 2 "Sec.

6291 AMH ENVI H3626.1 SB 6291 - H COMM AMD By Committee on Environment & Energy ADOPTED 03/03/2026 Strike everything after the enacting clause and insert the 1 following: 2 "Sec.
1.
RCW 70A.105.110 and 2019 c 442 s 20 are each amended to 3 read as follows: 4 (1) The local board of health shall ensure that individuals who 5 conduct inspections of on-site wastewater treatment systems as 6 defined in RCW 18.210.010 or who otherwise conduct reviews of such 7 systems are qualified in the technology and application of on-site 8 sewage treatment principles.
A certificate of competency issued by 9 the state board of registration for professional engineers and land 10 surveyors is adequate demonstration that an individual is competent 11 in the engineering aspects of on-site wastewater treatment system 12 technology.

Bill History

2026-03-24 Senate
Effective date 6/11/2026.

Official Summary Text

On-site wastewater systems

Current Bill Text

Read the full stored bill text

AN ACT Relating to on-site wastewater treatment system 1
inspections; and amending RCW 70A.105.110. 2
BE IT ENACTED BY THE LEGISLATURE OF THE STATE OF WASHINGTON:3
Sec. 1. RCW 70A.105.110 and 2019 c 442 s 20 are each amended to 4
read as follows: 5
(1) The local board of health shall ensure that individuals who 6
conduct inspections of on-site wastewater treatment systems or who 7
otherwise conduct reviews of such systems are qualified in the 8
technology and application of on-site sewage treatment principles. A 9
certificate of competency issued by the state board of registration 10
for professional engineers and land surveyors is adequate 11
demonstration that an individual is competent in the engineering 12
aspects of on-site wastewater treatment system technology.13
(2) A local board of health may allow noncertified individuals to 14
review designs of, and conduct inspections of, on-site wastewater 15
treatment systems ((for a maximum of two years after the date of 16
hire, if a certified individual reviews or supervises the work during 17
that time )) pursuant to this section under the supervision of a 18
S-4123.1
SENATE BILL 6291
State of Washington 69th Legislature 2026 Regular Session
By Senators Lovelett and Shewmake
Read first time 01/22/26. Referred to Committee on Local Government.
p. 1 SB 6291
certified individual. Such supervised practice may continue for a 1
maximum of four years after the date of hire. 2
--- END ---
p. 2 SB 6291