Chapter 173-230 WAC

On July 10, 2019 the Department of Ecology adopted amendments to Chapter 173-230 WAC Certification of Operators of Wastewater Treatment Plants. This rulemaking establishes a new fee schedule, clarifies requirements, and codifies existing program practices to improve the Wastewater Operator Certification Program.  Please see our Wastewater Operator Certification Program webpage for more information.  

Rulemaking timeline


Announcement phase (CR-101)

Filing date:
June 22, 2018

Announcement documents

​Announcement Notice – CR-101

Rule development phase

June 22, 2018 - March 2019

Public input & involvement

Advisory meetings

Sept. 6, 2018 
Rule Advisory Committee (RAC) Meeting
9:30 a.m - 2:30 p.m
Lacey Community Center
6729 Pacific Ave SE
Olympia, WA 98503

Oct. 2, 2018
Rule Advisory Committee Meeting
St. Placid Priory
500 College St NE
Lacey, WA 98516

An Informal Comment Period was held Oct. 25 - Nov. 26,  2018

See informal comments online.

Rule proposal phase (CR-102)

Filing date:
March 12, 2019

Rule proposal documents:

Comment period

We held a public comment period from March 12 to May 1, 2019.

See submitted comments


We held the following public hearings:

April 23, 2019 at 1:30 p.m.     
In-Person Public Workshop and Hearing         
Dept. of Ecology  
300 Desmond Dr.
Lacey, WA 98503

April 23, 2019 at 6:00 PM
Webinar (online) Public Workshop and Hearing

April 25, 2019 at 10:00 AM
In-Person Public Workshop and Hearing
Moses Lake Civic Center
401 South Balsam St.
Moses Lake, WA 98837

Rule adoption phase (CR-103)

Adoption date:
July 10, 2019

Rule effective date:
Aug. 10, 2019

Rule implementation information:

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, 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.