Beginning February 1, 2027, a property transfer in Washington requires a septic inspection by a third-party inspector authorized by the local health officer — WAC 246-272A-0270(1)(k). Here's what the rule says, in plain language.
📞 Call (509) 463-4972Selling in 2026? Most buyers and lenders already require the inspection — book it before you list.
Last reviewed: October 24, 2026
The rule is WAC 246-272A-0270(1)(k), part of Washington's on-site sewage systems code. Its key sentence: "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." In plain terms:
The rule is chapter 246-272A WAC, adopted by the Washington State Board of Health on January 10, 2024. Most provisions took effect April 1, 2025; the property-transfer inspection takes effect February 1, 2027.
This guide is general information about the rule, not legal advice. For a specific property or transaction, your local health district is the authority.
Legally, the transfer requirement starts February 1, 2027. Practically, most Eastern Washington home sales already involve a septic inspection today: buyers ask for it, lenders often require it, and a failed system found after closing is one of the most expensive surprises in a rural transaction. Sellers who inspect before listing control the timeline — and the repair bill — instead of negotiating under a closing deadline.
The transfer rule sits on top of Washington's existing routine inspection schedule, in WAC 246-272A-0270(1)(e):
These intervals applied before the 2027 rule and continue alongside it. If you don't know which type of system you have, an inspection is how you find out — along with your tank size, condition, and when it was last pumped (most tanks also need pumping every 3–5 years).
One more wrinkle: some Washington health districts let certified homeowners perform their own O&M inspections on conventional gravity systems, so a professional visit is not always required for the routine cycle — check your district's policy.
Possibly — but not on the timeline many owners expect. Beginning February 1, 2027, Washington requires a third-party septic inspection when a property with a septic system is sold or the deed transfers. Under WAC 246-272A-0270(1)(k)(ii), the local health officer can remove that requirement when the district has evidence of a recent compliant inspection — but each district defines "recent" itself. In Spokane County, the Spokane Regional Health District asks sellers for an inspection by a permitted O&M provider completed within the past 12 months, pumping if the report recommends it, plus an as-built drawing (or a site plan), with the report and a fee submitted to SRHD before closing. SRHD's listed exemptions are narrow: a system permitted and operational within the past 12 months, an O&M inspection within the past 12 months, or a system that was abandoned and connected to sewer. Stevens, Pend Oreille and Ferry counties follow the Northeast Tri County Health District; confirm its process directly, since it may differ. Staying current on routine inspections is still the surest way to be ready — and keep your reports, because acceptance depends on the paperwork.
The fastest way to reach us is by phone: (509) 463-4972. Prefer email? Write to contact@inlandnorthwestseptic.com with your town, what you need, and how urgent it is — that is all we need to get back to you with a price and a time window.
Beginning February 1, 2027, WAC 246-272A-0270(1)(k) requires that when a property with an on-site sewage (septic) system is transferred, the system be inspected by a third-party inspector authorized by the local health officer, following the inspection standard in WAC 246-272A-0260(5).
Under WAC 246-272A-0270(1)(e), conventional tank-and-gravity systems must be inspected every 3 years, and all other (alternative) systems must be inspected annually.
Possibly — but not on the timeline many owners expect. Under WAC 246-272A-0270(1)(k)(ii), the local health officer can remove the transfer requirement when the district has evidence of a recent compliant inspection, and each district defines "recent" itself. In Spokane County, "recent" means an inspection by a permitted O&M provider within the past 12 months — not the 3-year routine cycle. Staying current on routine inspections is still the surest way to be ready.
In rural Eastern Washington, a septic inspection for a home sale or routine O&M typically runs $300–$450. Pumping the tank at the same visit, if it's due, is usually $400–$600 for a 1,000-gallon tank — see our septic pumping cost guide.
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More guides: How much does septic pumping cost in Eastern WA & North Idaho? · How often should you pump your septic tank? · Signs your septic tank is full