This bill amends RCW 19.112.010, the definitions section of the motor fuel quality chapter, by updating and restating multiple statutory definitions. Revised definitions include alcohol fuel, biodiesel fuel, diesel, director (director of agriculture), E85 motor fuel, motor fuel, nonhazardous motor fuel, and renewable diesel. The changes reference federal and industry standards, including EPA registration requirements, ASTM specifications D5798 and D975, 26 C.F.R. Sec. 48.4082-1T (for dyed diesel as of October 24, 2005), and 40 C.F.R. Part 79 (2008). This is a modification of existing law limited to definitional changes in the motor fuel chapter, not the creation of a new crime or a change in penalties or enforcement procedures. The bill replaces or removes prior definition language in some places (for example, an earlier "alternative fuel" definition appears removed), and cross-references RCW 82.38.020 (special fuel) and RCW 19.122.020 (hazardous liquid). It lists the Washington State Department of Agriculture (director), the EPA, and ASTM as relevant authorities, and notes bill sponsors and legislative action: read in the Senate 2/4/26, passed the House 3/4/26 (94-0) and passed the Senate 3/10/26 (49-0). The extracted text contains only the amended definitions section and legislative certification text; it does not state an effective date or include any other operative sections. The certification/filing text appears incomplete, and the full prior and subsequent context of the deletions or edits elsewhere in the chapter is not provided.

If enacted, the bill mainly updates the official meanings of common fuel terms used by state regulators and the fuel industry, such as alcohol fuel, biodiesel, diesel, E85, motor fuel, nonhazardous motor fuel, and renewable diesel. In practice this clarifies which fuels qualify under Washington rules by tying biodiesel and renewable diesel to EPA registration and ASTM specifications, specifying ethanol content for E85, and confirming that ethanol blends may be marketed if either the base fuel or the final blend meets applicable standards. The definition of “director” is explicitly the director of agriculture, signaling that the Washington State Department of Agriculture will use these updated definitions in oversight and enforcement. The groups most affected are fuel producers, blenders, distributors and retailers, who will need to ensure their products meet the referenced EPA and ASTM registrations and specifications or satisfy the stated blending options; they may face ongoing verification or compliance costs to meet those standards. Regulators at the Department of Agriculture will apply the revised definitions when making decisions, but the bill text provided does not include an effective date or any enforcement or implementation details, so the timing and any transitional requirements are unclear.