Routine Septic Inspection in Snohomish County, WA

Snohomish County's property-transfer rule is its own process, with its own report and its own county fee. In general, when a property with a septic system changes hands, the inspection must have been done within the past 12 months, and the county steps need to be finished before closing. Systems installed within the previous 12 months are exempt. If that is your situation, go to the property-transfer septic inspection page and start there. A routine inspection will not file a Report of Property Transfer for you. The two visits can look similar on the ground, which is why this page is a separate request. A homeowner who just wants a condition check should not be sent down the sale path, and a buyer or seller should not assume a routine visit has done the county paperwork.

Ask the provider what they will check, because "inspection" can mean different things. A thorough visit typically looks at the tank and its accessible components, including baffles, filters, water level, scum and sludge, and general structural condition. It also covers the lids, accesses, and risers; the distribution box; and the drainfield and reserve area for signs of failure, such as wet ground or odours. The inspector should review the record drawing and previous reports where they exist. Components that cannot be located or evaluated should be noted in the written findings. An inspection is a snapshot of the system on the day it was seen. It does not guarantee the system, and it is not a substitute for a repair diagnosis when something is already failing. Pumping is a separate decision. It is worth doing at the same visit if the tank is due, or if the inspector needs to see the tank empty. Treat it as a separate service, typically $650 to $1,000, unless the provider has given you a combined price.

There is no single county calendar on this page that tells every homeowner when a routine inspection is due. A sensible interval is every few years, sooner if the system is older or you have had warning signs. A provider who has seen the system can give you a better interval than any general guide. If you have maintenance and monitoring in place, ask whether a full inspection is already part of that arrangement or whether this is an extra visit. Before the appointment, gather the record drawing if you have one, notes of the last pumping and inspection, and any repair history. Mark the tank and drainfield if you know them, and clear access to lids and risers. If you cannot find the tank, say so; locating and risers may need to come first. Our guide Is my Snohomish County home on sewer or septic? is the first stop if you are not sure which one you have.

You should leave the visit with written findings: what was checked, what was found, what could not be evaluated, and any recommended next steps. If the inspector recommends pumping, septic tank pumping is the follow-up. A $100 pumping rebate may be available through Savvy Septic where eligible. If the findings point to a failed component or a failing drainfield, use the repair page, or installation and replacement if the report already points that far. For the inspection rebate, only a full-system inspection with an OnlineRME report qualifies, after the free workshop. Our costs page lists the routine inspection figures with their sources. If a sale is now on the horizon, switch to the property-transfer page rather than assuming this report will do that job.