Welcome to the website for the Ontario Water Wastewater Certification Office. Explore our site to learn about operator licencing and certification under Ontario Regulations 128/04, 129/04, and 170/03.

Careers in Water and Wastewater

Water and wastewater operators serve their communities by protecting public health and the natural environment. For information on the type of careers you can expect in the water/wastewater industry, go to https://owwco.ca/careers-in-water-and-wastewater.


► Water Professional International Survey

Water Professional International (formerly ABC), creators of our Drinking Water and Wastewater Operator exams, are inviting Water Treatment and Water Distribution Operators to participate in a Job Analysis survey.  If you complete the survey, you will be entered into a draw for a gift card, with the top prize being worth $1000!  Have your say, help keep the exams topical, and earn a shot at a prize! Click here for more information.

► Return of employer-site operator-in-training certification exams

We are pleased to announce the return of online employer-site Operator-in-Training (OIT) certification exams.

Employer-site online OIT exams allow owners and operating authorities of municipal and First Nation drinking water and wastewater systems to schedule and hold OIT exams at their workplace.

If you are an employer looking to schedule an on-site exam, read the Employer-Site Examination Protocol to find out how and apply online here.

You can access the FAQs here.

► Expiry of Emergency Orders continued under the Reopening Ontario Act

Please see message from the Chief Drinking Water Inspector – Important updates regarding the expiry of Emergency Orders continued under the Reopening Ontario Act dated April 26, 2022.

► Changes to the drinking water and wastewater operator regulations

The Ministry of the Environment, Conservation and Parks recently amended O. Reg. 128/04 Certification of Drinking Water System Operators and Water Quality Analysts and O. Reg. 129/04 Licensing of Sewage Work Operators. These amendments allow the ministry, drinking water system and sewage works owners and operating authorities to act quickly to help ensure drinking water and waterways are protected during an emergency.

Further information on the regulatory amendments can be found on the Environmental Registry, please see:

  • Amendments to drinking water operator certification regulation (019-3513)
  • Amendments to wastewater operator licensing regulation (019-3515)

WCWC New Course Listing
Click here for WCWC Course Listing.

Operator Certification Bulletin
Download and read the latest Operator Certification Bulletin, the Drinking Water and Wastewater Operator Certification News by clicking HERE.

To subscribe to our email news bulletin Click HERE.

Operator Certification Working Group (OCWG)
The OCWG provides expertise to the Ministry on matters related to the water and wastewater operator certification program.

For recent meeting highlights, please go to https://owwco.ca/operator-certification-working-group-ocwg-meeting-highlights.

Upcoming Exams



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