Snohomish County, WA
Property-Transfer Septic Inspection in Snohomish County, WA
Since November 1, 2026, Snohomish County has required a property-transfer septic inspection when a property with a septic system changes hands. In general, the inspection must be done by a certified professional within 12 months of closing, and a Report of Property Transfer is filed with the county. Systems installed within the previous 12 months are exempt. A Washington statewide rule follows on February 1, 2027 (WAC 246-272A-0270). This page explains the rule in general terms — it is not legal advice, and whether an inspection is required for your property is something to check with Snohomish County or your title company. Who pays is for the buyer and seller to agree; the rule does not set it. If the inspection finds a failure, the system will need repair before the sale can proceed cleanly — which is why the inspection is best arranged early, not in the last week before closing. About 84,000 private septic systems serve homes in the county, and roughly 2,800 septic properties change hands in a typical year, so this rule touches a large share of county home sales.
Property-transfer septic inspection in Snohomish County, WA under the Nov 1, 2026 county rule. What it covers, what it typically costs, and who pays.
When you might need it
You are buying or selling a property in Snohomish County that has a septic system, or your lender, insurer, or title company has asked for an inspection before closing.
What is included
- Inspection of the tank: condition, sludge and scum levels, baffles, and accessible components.
- Inspection of the distribution box and drainfield, including signs of failure such as wet areas or odours.
- A Report of Property Transfer filed with Snohomish County (the county charges a $245 review fee for this).
- A written account of what was found, so buyer and seller know what — if anything — needs repair before closing.
Pricing guidance
Guidance only, never a quote. A property-transfer inspection typically runs $750, plus the $245 county Report of Property Transfer fee — $995 before pumping, if pumping is also needed. A routine inspection (not tied to a sale) typically runs around $500. A combined inspection and pumping visit is often budgeted at $1,000–$1,500. Only the provider can confirm a price for your property. (Sources: Septic Solutions LLC published prices, Oct 2026; Stanwood Septic; Snohomish County Board of Health fee schedule.)
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FAQ
Does the Nov 1, 2026 rule apply to my property?
In general, the rule applies to properties with a septic system that change hands in Snohomish County, with an exemption for systems installed within the previous 12 months. Whether it applies to your property specifically — and exactly what it requires — is something to check with Snohomish County or your title company. This site cannot confirm it for you.
How long is the inspection valid?
In general, the inspection must be within 12 months of closing. If the sale is delayed beyond that window, ask the county or your title company whether a fresh inspection is needed.
What happens if the inspection finds a failure?
A failed system will need repair — and in many cases the repair has to be planned before closing, because a buyer, lender, or insurer may not proceed with a known failure. Finding it early, rather than in the last week before closing, is what keeps a sale on track.
Is pumping included in the inspection price?
Usually not. Pumping is a separate service, typically from $650 in Snohomish County, and is often done at the same visit as the inspection. Ask the provider what is included before the visit, and expect the $245 county fee on top of the inspection price.