Petroleum Technical Assistance Program


“I need advice and technical assistance for a petroleum contaminated site.”

Effective June 1, 2021 PLIA will temporarily adjust our response goal for letters from 45 days to 70 days.  Please click here for more information.

If you have an questions or concerns, please contact Carrie Pederson.




The Petroleum Technical Assistance Program (PTAP) expands the state’s ability to respond to the high customer demand to clean up petroleum contaminated sites. Under the PTAP, the Pollution Liability Insurance Agency (PLIA) may provide informal site-specific technical consultations and issue written opinion letters to persons conducting independent remedial actions at qualifying petroleum cleanup sites. PLIA may provide these services under the authority of Chapter 70A.330 RCW and the Model Toxics Control Act (MTCA), Chapter 70A.305 RCW and Chapter 173-340 WAC.

The program is available for customers who conduct cleanups of qualifying petroleum contaminated sites and wish to receive an opinion letter from the state. The types of opinions provided include:

  • No Further Action (NFA) on the Site/Property.
  • Further Action (FA) on the Site/Property.
  • Partial Sufficiency (PS) of the cleanup.

PTAP projects

PTAP Project List

Learn more about the PTAP

PTAP One Pager – Information about the program.
PLIA UST Programs – Diagram of PLIA’s UST programs.
PTAP Definitions – Definitions of terms used in PTAP.
PTAP Guidance – Interpretive guidance for PTAP.
Program Eligibility Factors – Description of PTAP eligibility requirements.

Submitted an application, but:


To pay the program fee electronically please use the make payment button below.