Reference Source

Washington

For Washington, inspection required at sale? is Beginning February 1, 2027, obtain an inspection, as required in WAC 246-272A-0260 (5), by a third-party inspector authorized by the local health officer; exemptions is The local health officer may: (A) Remove the requirement for an inspection at the time of property transfer if the local health jurisdiction has evidence that the OSS is in compliance with (e) of this subsection and the OSS was inspected by a third-party inspector authorized by the local health officer; authority is WAC 246-272A-0270, verified against its source on 2026-08-18.

State
Washington our reading
Inspection required at sale?
Beginning February 1, 2027, obtain an inspection, as required in WAC 246-272A-0260 (5), by a third-party inspector authorized by the local health officer verified
Exemptions
The local health officer may: (A) Remove the requirement for an inspection at the time of property transfer if the local health jurisdiction has evidence that the OSS is in compliance with (e) of this subsection and the OSS was inspected by a third-party inspector authorized by the local health officer verified
Authority
WAC 246-272A-0270 verified
Sourceapp.leg.wa.gov
Verified
Review by
DatasetSeptic system inspection at property sale: which states require it

Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.

What the source says

(k) At the time of property transfer: (i) Provide to the buyer, all available OSS maintenance and repair records in addition to the completed seller disclosure statement in accordance with chapter <http://app.leg.wa.gov/RCW/default.aspx?cite=64.06> 64.06 RCW for residential real property transfers; (ii) Beginning February 1, 2027, obtain an inspection, as required in WAC <http://app.leg.wa.gov/WAC/default.aspx?cite=246-272A-0260> 246-272A-0260 (5), by a third-party inspector authorized by the local health officer. The local health officer may: (A) Remove the requirement for an inspection at the time of property transfer if the local health jurisdiction has evidence that the OSS is in compliance with (e) of this subsection and the OSS was inspected by a third-party inspector authorized by the local health officer;

app.leg.wa.gov, retrieved 2026-08-18

Source

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