Washington Septic Inspection at Sale: What Applies Today, What Changes in 2027

Sourced from WAC 246-272A-0270 and 246-272A-0260, chapter 64.06 RCW, the Washington State Department of Health, county health jurisdiction fee schedules, and Snohomish County Board of Health ordinance BOH26-02, adopted April 14, 2026 — last checked August 2026.

The date everyone quotes is February 1, 2027. But for homeowners in four Washington counties the requirement is already here, and in one large county it arrives in November 2026. Whether you need a septic inspection to sell your house is a county question before it is a state question — and it will stay that way even after the state rule lands.

Washington has roughly 950,000 on-site sewage systems, and chapter 246-272A WAC is administered by 35 local health jurisdictions covering 39 counties. The state sets the floor. Your local health officer sets what actually happens on your sale.

What the state rule requires

Under WAC 246-272A-0270(1)(k), when a property with an on-site sewage system changes hands the owner must do three things:

• Give the buyer all available maintenance and repair records, along with the seller disclosure statement required by chapter 64.06 RCW. This part applies now, not in 2027.
• Beginning February 1, 2027, obtain an inspection by a third-party inspector authorized by the local health officer. What that inspection has to cover is set out in WAC 246-272A-0260(5).
• Have any proprietary treatment product inspected according to the manufacturer’s recommendations.

The results go to your local health jurisdiction on a form the health officer approves, and the health officer may require a schedule for fixing anything the inspection turns up. That last point is the one that costs money, and it is why the inspection is worth thinking about well before you list.

“Third-party inspector authorized by the local health officer”

Both halves of that phrase matter. Third-party means someone other than you and other than the company that would end up doing any resulting work. Authorized by the local health officer means authorized by your health officer specifically — although WAC 246-272A-0340 does allow approval by reciprocity from another Washington jurisdiction.

One date has already passed and is easy to miss: since February 1, 2025, every local health officer has been required to run an approval process for maintenance service providers. Before that it was optional. So a provider who was operating perfectly legally in 2024 is not automatically approved now. Ask, and ask your health jurisdiction for its list rather than taking a contractor’s word for it.

Four counties already require this

The 2027 date is when the requirement becomes statewide. It is not when transfer inspections start in Washington. Clallam, Jefferson, Whitman and Asotin counties already require an inspection when property changes hands, under their own local ordinances.

Clallam is the one worth studying, because it shows where the state rule is heading: it exempts owners who hold an operation and maintenance contract. Keep a maintained, documented system and you are excused the scramble at closing. That is precisely the trade the state waiver makes, and Clallam has been running it for longer.

If you are in one of those four counties, none of what follows is hypothetical. It applies to your next sale.

Snohomish County is moving early

The Snohomish County Board of Health adopted Ordinance BOH26-02 at its meeting of April 14, 2026 — a public hearing that drew no public comment, followed by a unanimous vote — amending Title 5, Wastewater, of the county Board of Health Code. The requirement takes effect November 1, 2026, three months ahead of the state. That much is confirmed from the Board of Health’s own record of the meeting.

The numbers attached to it are a different matter. Local coverage of the hearing puts the Report of Property Transfer fee at $245 for 2026–27, rising to $255 the following year, and describes an inspection valid for 12 months, an exemption for systems installed within 12 months of the sale, an application review of up to 10 days, and roughly 2,785 septic properties changing hands each year against about 84,000 systems countywide. Those figures come from news reporting, not from the county’s adopted fee schedule, which is the authority on the fee. The ordinance and the dates are confirmed; the dollar amounts are not. If you are selling in Snohomish County this year, call the health department before you assume you have until 2027.

Can your county waive it?

Yes — the rule allows the local health officer to remove the requirement. But the conditions are considerably narrower than most summaries suggest, and they are the reason to start thinking about this now rather than at closing.

In short: your local health jurisdiction needs evidence that the system complies with the routine inspection schedule — every three years for a septic tank with a gravity drainfield, annually for everything else — and that it was inspected by an authorized third-party inspector. There is no recency window in the rule text, and a stack of pumping receipts does not qualify.

The full breakdown, including the exact rule language and what counts as evidence, is here: can your county waive the 2027 septic inspection?

The Department of Health put the same point plainly in its explanatory statement for the rule: “There is no requirement to inspect or added cost to the seller if the OSS is up-to-date with routine inspection requirements.” Being up to date is the whole game.

What it costs

Two separate charges, and people routinely budget for only one.

1. Your county’s fee for handling the report

Jurisdiction	Fee	What it is called
Spokane	No charge	Property Transfer Inspection Report Submittal
Snohomish	$245 (2026–27), $255 (2027–28)	Report of Property Transfer
Thurston	$290	Time of transfer fee
Grays Harbor	$310	Existing System Evaluation (septic only)
Tacoma-Pierce	$480, or $240 filed concurrently	Real estate transaction report

Spokane charges nothing. Pierce charges $480 — halved if you file it alongside another application, which is worth knowing before you file separately. Grays Harbor has no line item named for property transfer; the $310 existing-system evaluation is the nearest published equivalent, so confirm it fits your situation.

Fees for the other jurisdictions are on our Washington septic permit fees page, along with the counties whose schedules we could not source.

2. The inspector

No Washington source prices a property-transfer inspection as a distinct service. We looked, and we are not going to invent a number.

What we can source is the cost of a routine operation-and-maintenance inspection, published by county health departments:

• Clark County Public Health: $99–$115 for a basic inspection by an O&M service provider, noting it can be more depending on system type.
• Tacoma-Pierce County Health Department: $250–$350 for a typical routine inspection, which must be done by a certified O&M inspector.

Those are routine inspections, not transfer inspections. Because a current routine inspection is what the waiver route turns on, they are arguably the right ballpark — but that is our inference, not a published figure, and an inspection on a complex or hard-to-access system will cost more.

If you are selling

Start with what type of system you have, because it decides your inspection interval: three years for a septic tank with a gravity drainfield, annual for a mound, sand filter, pressure-distribution system or any proprietary treatment unit. Most people who assume they are on a three-year cycle are actually on an annual one.

Then, in order: ask your local health jurisdiction for its list of approved providers; get an inspection on the books; keep the report somewhere you can find it. If you are selling inside a year, budget for both charges above and treat the inspection as part of the cost of sale. If you are two to five years out, this is where the waiver is genuinely winnable and where starting now actually pays.

And gather the paperwork regardless. The obligation to hand over all available maintenance and repair records is not waiting for 2027 — it is in the rule now.

If you are buying

Ask for the records early, not at inspection contingency. Specifically ask for: the original permit and as-built drawing, the pumping and inspection history, and any operation and maintenance contract. The seller is required to give you what they have.

Three things worth checking that buyers routinely miss:

• Where the reserve area is. That is the land legally set aside for a replacement drainfield — you cannot build a shop, pool or addition over it, and it is the most common reason a lot that looks big enough is not.
• Whether the system is on an annual or three-yearly schedule, because that is the ongoing obligation you are inheriting.
• Whether the county runs an operational permit with a recurring fee. Some do, some do not, and it is rarely mentioned in a listing.

If the inspection turns up a failure, remember the local health officer can require a compliance schedule. That becomes your problem after closing unless it is dealt with in the contract.

The timeline, in one place

Date	What happens
January 10, 2024	State Board of Health adopts the revision to chapter 246-272A WAC
April 1, 2024	First changes take effect
February 1, 2025	Local health officer approval of maintenance service providers becomes mandatory
April 1, 2025	Most remaining provisions take effect
November 1, 2026	Snohomish County’s own requirement begins (reported)
February 1, 2027	Statewide property-transfer inspection requirement begins

Clallam, Jefferson, Whitman and Asotin already require a transfer inspection under local ordinances, independent of this timeline.

What we do not know

Being straight about the gaps, because this is a rule that has not taken effect yet and a lot of confident writing about it is guesswork:

• How each of the 35 jurisdictions will administer the waiver. The rule gives them room to publish a bright-line policy or decide case by case. Most have not said which.
• What the inspection will actually cost on the open market. No Washington source prices it yet.
• Which additional counties will move early. Snohomish appears to be first; others may follow and we will update this page when they do.
• Whether jurisdictions will require more than the rule’s minimum. They are explicitly allowed to, and jurisdictions with shellfish growing areas, sole source aquifers or nitrogen-sensitive marine waters have reason to.

This site is an independent information resource. We are not a health jurisdiction and we are not affiliated with the Washington State Department of Health or any county health department. Nothing here is legal advice. Where this page and your local health jurisdiction disagree, your jurisdiction is right — and we would like to hear about it so we can correct this page.

Sources

• WAC 246-272A-0270, operation and maintenance, property transfer and the waiver — rule text
• WAC 246-272A-0260, what an inspection must cover — rule text
• WAC 246-272A-0340, approval of installers, pumpers and maintenance service providers — rule text
• Washington State Department of Health, On-site Sewage System Rule Revision — rule revision
• Washington State Department of Health, On-site Sewage Systems overview (the 950,000 figure) — OSS overview
• Washington State Department of Health, Washington’s Public Health System (35 jurisdictions, 39 counties) — public health system
• Spokane Regional Health District, 2026 Approved Fee Schedule — fee schedule (PDF)
• Thurston County PHSS, 2025 Fee Schedule — fee schedule (PDF)
• Tacoma-Pierce County Health Department, fee schedule and inspection guidance — fees
• Grays Harbor County, 2026 Environmental Health Fee Schedule — fee schedule (PDF)
• Clark County Public Health, property owners and inspection costs — property owners
• Lynnwood Times, Snohomish County Board of Health septic action, April 2026 — report
• Chapter 64.06 RCW, seller disclosure — statute

Last reviewed August 2026 against the current text of chapter 246-272A WAC. The statewide requirement takes effect February 1, 2027; several counties are earlier. We update this page as jurisdictions publish their policies.