Buying a House With a Heating Oil Tank in Washington (2026)

Short answer: If the house you want has an old heating oil tank, sort out the tank before you close, not after. Washington’s state heating oil insurance ended in 2025, so there is no state policy to fall back on if the tank has leaked. PLIA’s replacement program offers grants for testing and cleanup, but only to the person who owns the property, which means the seller is the one who can apply while you’re still under contract. Ask what kind of tank it is, whether it’s still in use, and what paperwork exists. Then use your inspection period to test and negotiate.

What changed in 2025

For years, Washington’s Pollution Liability Insurance Agency (PLIA) ran a heating oil insurance program for registered residential tanks. PLIA says that policy expired June 30, 2025. Registrations ended August 1, 2025, and no new claims were accepted after July 31, 2025. Existing claims can be reopened only by the original owner.

The program moved into PLIA’s Heating Oil Loan and Grant Program (HOLG) on July 1, 2025. PLIA says the grants aren’t income-based and don’t have to be repaid. The catch for buyers is eligibility. To apply, you must "own the property where the heating oil tank is located." In its program FAQ, PLIA also says that in its experience, most homeowner’s insurance policies don’t cover contamination from a heating oil tank on the property where the tank is.

What PLIA’s grant program pays for

Based on: PLIA Heating Oil Loan and Grant Program page and program FAQ (revised 6/2026). PLIA says "most often, cleanup estimates exceed $60k," and it must pre-approve all work. It does not reimburse work already done.

Timing matters too. PLIA says the 2026 fall/winter application cycle is open through December 17, 2026, and that processing times are longer than normal. Its FAQ says cycles run twice a year, each open for 45 days, and that PLIA accepts up to 60 completed applications per cycle. A grant is not something to count on inside a typical inspection period.

Questions to ask the seller

• Is the tank underground or above ground, and is it still in use? The house may have switched to another heat source and left the tank behind.
• If it’s out of service, was it removed or closed in place? Ask for the paperwork either way.
• Has the soil been tested, or has a leak ever been reported? PLIA says a leak should be reported to the Department of Ecology through its Environmental Report Tracking System (ERTS).
• Is there a No Further Action letter? PLIA issues these through TAP when a completed cleanup meets the state cleanup rule, and says one "may be helpful with future property transfers."
• What does the seller disclosure say? The Environmental section of the Washington disclosure form asks about substances that may be environmental concerns and names "fuel or chemical storage tanks" as an example.

Under RCW 64.06.010, a buyer can waive the disclosure statement, but not the Environmental section if any answer in it would be yes. RCW 64.06.020 currently has two versions on the Legislature’s site: one marked effective until January 1, 2027, and one effective January 1, 2027. The questions quoted here appear in both. If your purchase runs across the new year, check which form the seller used.

Removed vs. closed in place

PLIA says your local fire chief or fire marshal decides how out-of-service heating oil tanks are handled, and most fire districts follow the 2021 International Fire Code, Section 5704.2.13. Under that section, an underground heating oil tank out of service for at least a year has to be removed from the ground or permanently closed in place.

A tank closed in place has to be emptied of liquid and sludge, have its lines detached, be filled completely with an approved inert solid material, and have its remaining underground piping capped or plugged. All outside above-grade fill piping has to be removed, and the owner keeps a record of the tank’s size, location and closure date for up to five years. That record is worth asking for. A fill pipe still sticking out of the yard can be a sign the job wasn’t finished.

Using your inspection period

An oil tank is a good reason to read what a standard home inspection covers closely and to ask your inspector whether they look at oil tanks at all. Under your inspection contingency, you can also hire an environmental consultant or tank service company to test the soil and look at the tank. Then you can ask the seller to remove or decommission it, apply to PLIA before closing, or adjust the deal. Our page on contingencies explains how these deadlines work in a Washington purchase agreement.

If the tank is in use, PLIA’s one-page guide suggests checking it for water at least once a year with a long stick and water-indicating paste, because water in the tank may mean it’s leaking. If a leak turns up, PLIA says to report it to Ecology. In the Northwest Region, which includes King and Snohomish counties, that number is 206-594-0000. If surface water or groundwater is affected, PLIA says to also call the Washington Emergency Management Division at 1-800-258-5990. Cleanup falls under the state Model Toxics Control Act rules, chapter 173-340 WAC. PLIA says cleanup doesn’t have to start right away if there’s no imminent threat to people or the environment.

Who pays for testing, removal or cleanup depends on what you and the seller negotiate. For questions about liability or a neighbor’s property, PLIA suggests talking with an attorney.

FAQ

Does PLIA’s heating oil insurance still cover a tank I’m buying?

No. PLIA says the Heating Oil Pollution Liability Insurance Program policy expired June 30, 2025, registrations ended August 1, 2025, and no new claims were accepted after July 31, 2025. An existing claim can be reopened only by the original owner, so a buyer can’t take over a seller’s coverage.

Can I apply for a PLIA heating oil grant before I close?

Not as the buyer. PLIA’s Heating Oil Loan and Grant Program requires applicants to own the property where the tank is located. The seller is the one who can apply while they still own it. PLIA also has to pre-approve work before it starts and does not reimburse work already completed.

How much does the PLIA heating oil grant pay?

PLIA lists up to $75,000 in total program funding per qualified owner, including a $7,000 Preliminary Planning Assessment grant, a $1,500 Technical Assistance Program enrollment grant if contamination is found above state cleanup levels, and a tank removal and cleanup grant of up to $60,000. PLIA says cleanup estimates most often exceed $60,000.

What does a No Further Action letter mean for a heating oil tank?

It’s an opinion letter PLIA issues through its Technical Assistance Program when a completed cleanup meets the substantive requirements of the state cleanup rule, chapter 173-340 WAC. PLIA says a No Further Action letter may be helpful with future property transfers, so ask the seller whether one exists.

Does a seller have to disclose an oil tank in Washington?

The Washington seller disclosure statement asks whether there are any substances, materials or products in or on the property that may be environmental concerns, and lists fuel or chemical storage tanks as an example. A buyer can waive the disclosure statement, but not its Environmental section if any answer there would be yes.

Talk it through with a local agent

Peter Kim and Odigo Real Estate Club can help you plan the inspection, the right questions and the negotiation when a house you like has an old oil tank, with 25+ years combined experience, 593+ closings, and 122 five-star Zillow reviews. See our home buying services.

Odigo Real Estate Club · REAL Brokerage, WA #112064 · 16108 Ash Way, Suite 201, Lynnwood, WA 98087 · (425) 409-3823 · Mon–Sat 9 AM–6 PM, closed Sunday

Sources

• Pollution Liability Insurance Agency (PLIA), Heating Oil Insurance Program Transition (policy expired June 30, 2025; no new claims after July 31, 2025; transition to HOLG July 1, 2025; grants not income-based), https://plia.wa.gov/heating-oil-insurance-program-transition/ , accessed Nov 2, 2026.
• PLIA, Heating Oil Pollution Liability Insurance Program (registrations ended Aug 1, 2025; reopening limited to original owner; report releases to Ecology), https://plia.wa.gov/heating-oil-pollution-liability-insurance-program/ , accessed Nov 2, 2026.
• PLIA, Heating Oil Loan and Grant Program (2026 fall/winter cycle through Dec 17, 2026; grant amounts; pre-approval; eligibility requires owning the property; No Further Action letter), https://plia.wa.gov/heating-oil-loan-and-grant-program/ , accessed Nov 2, 2026.
• PLIA, Heating Oil Loan and Grant Program Questions and Answers (revised 6/2026) (homeowner’s insurance and tank contamination; up to 60 applications per cycle; 45-day cycles; source property and attorney note), https://plia.wa.gov/wp-content/uploads/HOLG-FAQ-6.26.pdf , accessed Nov 2, 2026.
• PLIA, Heating Oil Tank Decommissioning (local fire chief or fire marshal; 2021 IFC 5704.2.13 removal or closure in place), https://plia.wa.gov/heating-oil-tank-decommissioning/ , accessed Nov 2, 2026.
• PLIA, Heating Oil Tank Leaks (ERTS reporting, Northwest Region number, Emergency Management Division number, MTCA cleanup), https://plia.wa.gov/heating-oil-tank-leaks/ , accessed Nov 2, 2026.
• PLIA, Check Your Heating Oil Tank for Water (annual water check and what water in a tank may indicate), https://plia.wa.gov/wp-content/uploads/2022/02/Checking-Your-Heating-Oil-Tank-For-Water.pdf , accessed Nov 2, 2026.
• Washington State Department of Ecology, Report an environmental issue (Environmental Report Tracking System), https://ecology.wa.gov/footer-pages/report-an-environmental-issue , accessed Nov 2, 2026.
• Washington State Legislature, RCW 64.06.010 (exclusions; buyer may not waive the Environmental section if any answer would be yes), https://app.leg.wa.gov/RCW/default.aspx?cite=64.06.010 , accessed Nov 2, 2026.
• Washington State Legislature, RCW 64.06.020 (seller disclosure statement form, Environmental section; version effective until Jan 1, 2027 and version effective Jan 1, 2027), https://app.leg.wa.gov/RCW/default.aspx?cite=64.06.020 , accessed Nov 2, 2026.

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