How the PLIA heating oil grant window works

Washington’s Pollution Liability Insurance Agency, PLIA, takes Heating Oil Loan and Grant applications only during a limited window each year, usually about six weeks in late fall; PLIA’s site lists the current dates. The program can fund up to $75,000 per project for heating oil tank cleanup and related work. It is not income-limited, but PLIA must approve a project before any work starts.

If you heat with oil or have an old tank in the yard, the next window is worth putting on the calendar. The Seattle Heat Pump Company plans and manages oil-to-heat-pump conversions in Seattle and King County, carried out by licensed and insured contractors, and the PLIA timing is one of the first things settled on those projects.

Why this program matters now

For years, Washington homeowners with heating oil tanks could rely on a free state insurance program for leak cleanup. That program has ended. Its insurance policy expired on June 30, 2025, and new claims were no longer accepted after July 31, 2025. Claims for leaks reported before July 1, 2025 can still run their course, but a leak found today has no state insurance behind it.

Cleanup is not cheap. The City of Seattle notes that cleanup costs can exceed $10,000, and PLIA says most completed cleanups exceed $60,000. The Heating Oil Loan and Grant program is the state’s successor to the old insurance, and it works very differently.

What the program offers

PLIA describes the program as offering up to $75,000 per project, built from several pieces:

• A preliminary planning assessment grant of up to $7,000, carried out by a consultant PLIA assigns, to size up the site.
• A tank removal and cleanup grant of up to $60,000 per applicant for a single tank, covering cleanup and the tank removal associated with it.
• A Technical Assistance Program enrollment grant of $1,500 where contamination exceeds state cleanup levels, which can lead to a No Further Action opinion that helps at sale time.
• An infrastructure upgrade loan for converting the heating system, installing a new tank or decommissioning in place, at the prime rate as of March 1 of the application year, with 10, 20 or 30-year terms and no prepayment penalty.

Anyone who owns the property can apply; there is no income limit. PLIA has noted longer than normal processing times, so expect the review to take a while.

The rule that catches people: approval first

PLIA must approve the work before it starts, and it does not reimburse work already completed. Decommissioning a tank, removing it or starting a cleanup before approval forfeits the funding for that work.

That has a direct effect on how a heat pump conversion is sequenced. If you want PLIA money for the tank or a loan for the conversion, apply in the window, wait for approval, and only then schedule the tank work. The heat pump itself can often be planned in parallel, but the tank stays untouched until PLIA says go. The oil tank decommissioning page explains how removal and filling in place differ, and the oil to heat pump conversion page covers how the two halves of the project fit together.

Who should apply in the next window

The program is most valuable when there is real uncertainty about the tank:

• You suspect a leak: oil smell, stained soil, unexplained oil use or a failed tank test.
• You expect to sell, and want any contamination handled through a process that can end in a No Further Action opinion.
• You want financing for the heating conversion or the decommissioning through the upgrade loan.

For a tank with no sign of trouble that will be filled in place and paid for outright, some owners decide the wait is not worth it. Filling a clean tank in place typically runs about $700 to $3,000 in the Seattle area plus the $184 Seattle Fire Department permit. That is a judgment call about risk and timing, not a rule, and if a leak turns up later, the work done before approval cannot be claimed.

How it fits with Seattle’s rebates

PLIA’s program covers the tank side. On the heat pump side, Seattle homes heated with oil can get Seattle Clean Heat’s $2,000 rebate on a qualifying Mitsubishi Electric heat pump from a participating contractor, plus $4,000 for households at 81% to 150% of area median income on installations completed within the program’s current funding period. City Light’s contractor discount adds $300 or $600. Outside Seattle, Clean Heat does not apply, but PLIA is statewide. The rebate guide keeps the current amounts, and the oil conversion cost guide shows how the ranges add up.

The two calendars can pull against each other. A PLIA approval that takes months can run up against the end of Clean Heat’s current funding period, so plan both together. The illustrative conversion walkthrough shows where these decisions fall in a typical project, and the heat pump versus oil furnace guide helps if you are still deciding whether to convert at all.

Applications go directly to PLIA; check its website for the forms and current details before the window opens.