Voluntary: Beginning in the summer of 1999, the Seattle area (King, Pierce, Kitsap, and Snohomish counties) has had a voluntary max. 7.8 psi RVP gasoline program. This program ran from June 1 through September 15 at retail in 1999 and 2000. In 2001, the duration was reduced to July and August by the Puget Sound Clean Air Agency.

Current Regulations: Spokane had a winter (Oct. - Feb.) oxygenated gasoline standard. See WA Administrative Code Chapter 173-492 and WA SIP - Spokane County Air Pollution Control Authority - Regulation I - Article VI - Section 6.16. The Board of Directors of the Spokane County Air Pollution Control Authority repealed winter oxygenated gasoline regulations on September 1, 2005.

On May 9, 2001, the Governor signed HB 1015 that bans MTBE after December 31, 2003 and, after July 22, 2001, in no event may MTBE be knowingly mixed in gasoline above 0.6 vol%. See Revised Code of Washington 19.112.100.

On March 30, 2006, the Governor signed Substitute SB 6508. By 12/1/08, motorfuel licensees, other than motor vehicle fuel distributors, shall provide evidence that at least 2 percent of the gasoline sold in WA, on a quarterly basis, is denatured ethanol. This ethanol percentage could be increased if the Director of Ecology determines that greater than 2 percent ethanol will not jeopardize continued attainment of the federal ozone NAAQS, and if the Director of Agriculture determines that sufficient materials are available within WA to support economical production of ethanol at higher levels. Special fuel licensees shall provide evidence that at least 2 percent of the annual diesel fuel sold in WA is biodiesel fuel (monoalkyl esters of long chain fatty acids derived from plant or animal matter), following the earlier of 1) Nov. 30, 2008 or 2) when it is determined that feedstock grown in WA can satisfy a 2 percent requirement. This biodiesel percentage could also be increased. See chapter 338, 2006 Laws. Also see RCW 19.112.110 to 19.112.180. The Department of Licensing is responsible for tracking biodiesel and ethanol fuel use. Substitute HB 1010, signed by the Governor on 4/20/09 (Chapter 132, Laws of 2009), allows renewable diesel to meet the biodiesel requirement, effective 7/26/09.

Washington adopts ASTM motor fuels standards by reference and they are enforced by the WA Department of Agriculture, Weights and Measures Program; see RCW 19.112. 

Legislature:  Introduced in January 2013, HB 1169 would prohibit a cap and trade system, regulate motor vehicle fuel economy, or otherwise address greenhouse gas emissions without direct and specific legislative authorization, and would require any state agency to suspend all such activities.  

HB 1325, introduced in January 2015, would prohibit a regulation of the carbon content of transportation fuels until authorized by the state legislature.  Introduced in February 2015, HB 1881 would require legislative authorization for any LCFS regulation. 

Prefiled in December 2017, HB 2338 would limit the carbon intensity in transportation fuels (electricity and any liquid and gaseous fuel supplied to propel a motor vehicle or is intended for other transportation purposes), on a lifecycle basis, to 10% below 2017 levels by 2028 with a start date of 1/1/20.  Fuels used for aircraft, vessels, or railroad locomotives are exempt.  

Proposed State Actions: Executive Order 09-05 (5/21/09), among other provisions, directs state agencies to work on low carbon fuel standards or alternative requirements to reduce carbon emissions from the transportation sector. The WA Department of Ecology, in consultation with the WA Departments of Commerce and Transportation, conducted workshops in 2009 and 2010 to evaluate LCFS.

On December 17, 2014, Governor Inslee directed the Department of Ecology to draft a clean fuel standard rule to reduce carbon emissions in the transportation sector. 


Last updated January 2018