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Chapter 173-400 WAC, Chapter 173-401 WAC

This rulemaking proposes to change two rules:
  • General Regulations for Air Pollution Sources - Chapter 173-400 WAC - establishes the regulatory framework to ensure that healthy air quality exists in Washington, including meeting federal air quality standards.
  • Operating Permit Regulation - Chapter 173-401 WAC - establishes a permit program that consolidates all air quality requirements for large industries in a single permit.

Changes will:

  • Remove exceptions for emissions during startup, shutdown, and malfunction to comply with EPA’s direction in the startup, shutdown, malfunction SIP call. This includes provisions such as affirmative defense, director’s discretion and automatic exemption
  • Allow public notices to be posted on an agency website instead of exclusively requiring newspaper notice.
  • Simplify application of nonroad engine requirements.
  • Update the adoption of federal rules and update the definition of volatile organic compounds (VOC) based on changes to the federal definition..
  • Correct errors.
  • Make the rules easier to understand.

Rulemaking Timeline


Announcement Phase (CR-101)

Filing date:
Dec 16, 2016

Announcement documents

Rule Development Phase

July 21, 2015 - January 24, 2018

Public input & involvement

Stakeholder Workgroup Meetings

Additional Languages

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


To request ADA accommodation for disabilities, or printed materials in a format for the visually impaired, call Hanna Waterstrat at 360-407-7668 or email hanna.waterstrat@ecy.wa.gov. Persons with impaired hearing may call Washington Relay Service at 711. Persons with speech disability may call TTY at 877-833-6341.