Exploratory rulemaking for Chapter 173-460 WAC

We’ve started exploratory rulemaking to update Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.  This rule applies to businesses that emit toxic air pollutants to:
  • Provide specific criteria and conditions for permitting new or modified sources.
  • Build on the standard permitting framework for new sources.
  • Establish emission thresholds for about 400 toxic air pollutants.

Exploratory rulemaking

Exploratory rulemaking is a different approach to updating a rule.  Instead of updating the rule all at once, we're making changes in multiple rulemakings:

  1. Update the list of toxic air pollutants based on recent health information.
  2. Look at other updates to the rule:
    • Use stakeholders' feedback to consider other possible changes.
    • Prioritize the changes.
  3. Start other potential rulemaking(s).

Public input


Discussion Topics


Aug. 8, 2018
1 p.m. – 3 p.m.
Your ideas about what could be changed.
  • How protective of our health is the current structure?
  • What updates and efficiencies can we add?
  • How can we streamline or standardize implementation?
  • Where can we add flexibility?
Ecology, Lacey (map to location)
webinar *
mid-January 2019 to be announced closer to meeting date Ecology, Lacey (map to location)
webinar *

* 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.

Public comment period

Tell us what you think could be updated in this rule.  The public comment period is August 8, 2018 – March 1, 2019Submit your comments online.

Rulemaking timeline


Additional languages

Español (Spanish) 中文 (Chinese) Tiếng Việt (Vietnamese) 한국어 (Korean)