Unincorporated King County · Washington

King County oil tank decommissioning permit records

Confirm unincorporated jurisdiction before requesting the County tank-work file. Seattle, Bellevue and pre-annexation records need different custody decisions.

Open King County permit-record research What to prepare ↓

Official links open the agency site. No records request is submitted from this page.

Source instructions reviewed
2026-10-11
Not a live availability guarantee

Before you search

Start with the right identifiers.

Site address, parcel number, legal jurisdiction at the work date, approximate removal/abandonment year and any Fire permit reference.

Bring what you have. Missing identifiers can be part of the route review.

What you are looking for: The County-held tank-work permit and available inspection/certification attachments for the correct jurisdiction and time period.
If the result is empty or incomplete: Confirm city limits and annexation dates first. Seattle and Bellevue generally require their own city searches; historic County custody can differ. Adapt the request outline ↓

Confirm custody and request the County file

King County's permit-record research page covers unincorporated property and links a jurisdiction check and account-based records request. It directs city-limit properties to their city, while noting some pre-annexation County records remain with Permitting. Ask for the tank-work permit and existing attachments using the work date and parcel.

Official sourceKing County permit-record research

Name removal or abandonment-in-place

The County's decommissioning handout distinguishes residential removal/abandonment certification from commercial tank work. Use it to name the existing permit and certification documents you seek; do not start a new permit application merely to investigate old work. Requirements in a handout are not proof of what was filed.

Official sourceKing County underground-fuel-tank handout

Keep historic gaps and referrals visible

If the permit cannot be located, record the identifiers, work period and office searched. Use the County page's research request or older-record referrals for the specific gap. Our worksheet keeps an empty online search, an agency referral and a delivered certification as separate outcomes.

Official sourceCounty records requests and historic resources

After the search

What should you actually come away with?

A County tank-work file for the correct work-date jurisdiction, not a countywide assumption.

Jurisdiction at work date

Compare parcel, work year, city limits and any annexation history.

Still missing? A Seattle or Bellevue mailing address alone does not establish which office holds the file.

County attachments

Separate the permit authorization, inspection and certification actually obtained.

Still missing? A referral or online blank remains a next step, not certification that no tank exists.

Comparison checklist by Oil Tank Route, based on the official routes above. Not an agency certification, document authentication or a property-safety finding.

Before you interpret the result

Can I use this route for a Seattle mailing address?

Only after checking legal jurisdiction and the work date. A mailing city does not establish County permit custody. King County directs city-limit properties to the city, while retaining some records from before annexation.

Your private record worksheet

Keep the next step clear.

Prepare search keys here, open the official sources above, then record what happened. Nothing is searched or sent automatically. A postal city or ZIP does not establish legal jurisdiction.

Suggested document scope for this route: the residential underground fuel tank removal/abandonment permit, inspections and certification attachments. Narrow this to the files you still need.

Interactive saving and draft preparation require JavaScript. You can still follow every official route above, copy the request outline below and print this page. Do not enter personal details in disabled fields.

Optional identifiers — stay in your browser

Property address (optional) Parcel / block and lot Permit / incident / project number Approximate work dates

Specific documents still needed

What happened at each source?

These are your notes, not verified agency findings. Leave a source as “Not checked” until you use it.

Confirm custody and request the County file Name removal or abandonment-in-place Keep historic gaps and referrals visible Search date / request reference / next check (optional)

Your next actions

Start with the identifiers and first applicable source. An online blank, an inaccessible portal and an agency no-record reply are three different outcomes.

No result is not proof of no tank. A candidate document still needs its property, issuer, dates and stated scope checked.

Prepared request draft

Review and edit bracketed fields after copying. Use the agency’s current official form, disclosures and fee instructions. Drafted ≠ sent ≠ acknowledged ≠ delivered.

Default: this tab’s session only. Device saving is optional; avoid it on shared devices. No property details enter the page URL or analytics.

Self-service guidance only here. Human research assistance is currently limited to New Jersey and New York.

Make the request specific

A ready-to-adapt outline.

Please provide existing residential underground fuel tank removal or abandonment-in-place permits, inspections and certification attachments for [address; parcel], work [dates], permit [number]. The property was [jurisdiction at work date]. Please identify any pre-annexation custody or older-file referral if relevant.

Replace the bracketed fields and follow the agency’s current form, disclosure, and fee instructions. This is a draft, not a sent request.

Keep the limits visible.

This is not a countywide database of every residential tank and does not substitute for Seattle or Bellevue city files. No County record is not proof of no tank. Washington guidance is self-service only.

Active leak or strong oil odor? Use the safety route. ↗