Wastewater Operator Certification Program

Wastewater treatment plants (WWTPs) serve an essential function to protect public health and the environment, including Washington's rivers, lakes, streams, and Puget Sound. The certification of wastewater treatment plant operators helps make sure they are knowledgeable, and that WWTPs are properly operated and maintained.

Electronic renewal notices for 2021

Online Renewal Payment

New for 2021 — pay your renewal online. You will need to know your invoice number, which is your certificate number and the renewal year: 1968–2021 (cert #-renewal year).

There is a 4.2% convenience fee for debit and credit card payments. There is not a convenience fee for eCheck payments. To pay with eCheck, you will need your bank routing number and account number.

Go to EcoEPay to make an online payment.

Renewal Notices Emailed

We emailed renewal notices Oct. 23, 2020. If we did not have your email address, we mailed it. We are emailing the validation cards. Please update your email address.


Frequently asked questions: coronavirus impacts to the OpCert Program (updated July 1, 2020)



Emergency certificates


Professional growth

On-call emergency operator list

Operator communication

Drawing by James Davis

Wastewater Treatment Plant Operator Certification Program Guidance

We adopted changes to chapter 173-230 WAC Certification of Operators of Wastewater Treatment Plants in 2019. This:

  • Established a fee schedule in rule as directed by the Legislature in 2018.
  • Included multiple changes, such as:
    • Providing for an Operator in Training and respective education and experience qualifications for Groups II-IV.
    • Acknowledging new technologies in wastewater treatment.
    • Creating stand-alone sections where more information and clarity were needed.
    • Clarifying rule language to codify existing program practice.

Find out more about the new fees and Operator in Training Group levels II-IV from our focus sheet.
To learn even more, visit the rulemaking webpage.