Chapter 173-423 WAC

The purpose of this rulemaking is to update Chapter 173-423, Low Emission Vehicles to match California's vehicle emission standards for greenhouse gases approved on September 28, 2018. These changes:
  • Clarify that vehicle makers would need to meet existing standards agreed to by California, the federal government, and automakers in 2012. This would apply to cars and light-duty trucks sold in Washington for model years 2021 through 2025.
  • Update requirements and test procedures for meeting California's vehicle emission standards.
  • Update requirements for on-board diagnostic systems from California's 2015 rulemaking.

Rule proposal phase (CR-102)

Filing date:
Nov. 7, 2018

Rule proposal documents:

Comment period and public hearing

Comments are due by December 18, 2018.  You can submit comments in the following ways:

           December 11, 2018 at 2 p.m.
           Department of Ecology
           300 Desmond Drive SE
           Lacey, WA  98503

  • Mail to:  Elena Guilfoil
                  Department of Ecology
                  P.O. Box 47600
                  Olympia, WA 98504-7600

Webinar information

We are also holding this public hearing via webinar.  A webinar is an online meeting forum that you can attend from any computer with internet access.

Register to receive your access code and password.

To hear the webinar better, use your phone (instead of the computer) to call 1-240-454-0887.

Rulemaking timeline


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