Chapter 173-201A WAC (revisions)

Ecology is beginning a rulemaking for multiple revisions to Chapter 173-201A WAC, Water Quality Standards for Surface Waters of the State of Washington.

This rulemaking will consider: 
  • Amending the numeric criteria for total dissolved gas in the Snake and Columbia rivers:
    • WAC 173-201A-200(1)(f)(ii)
  • Amending specific sections of the rule to meet legal obligations in a 2018 Stipulated Order of Dismissal:
    • WAC 173-201A-200(1)(c)(ii)(B)
    • WAC 173-201A-210(1)(c)(ii)(B)
    • WAC 173-201A-240(5) Table 240 footnote dd
  • Aligning the rule with the Washington State Department of Health Shellfish Program:
    • WAC 173-201A-210(2)(b)
  • Clarifying the descriptions of marine water aquatic life use designations:
    • WAC 173-201A-210(1)(a)
    • WAC 173-201A-610 Table 610
Other sections of Chapter 173-201A WAC may be amended, as necessary, to support any revisions to the sections noted above.

Rulemaking timeline


Announcement phase (CR-101)

Filing date:
May 8, 2019

Announcement documents

Rule development phase

May 2019 - July 2019

Public input & involvement

May 8 to May 29, 2019: We held a public comment period on the scope of the Environmental Impact Statement.

Additional languages

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To request ADA accommodation for disabilities, or printed materials in a format for the visually impaired, contact Ecology's ADA Coordinator by email at, or call 360-407-6831. People with impaired hearing may call Washington Relay Service at 711. People with speech disability may call TTY at 877-833-6341.