Ontario Water Wastewater Certification Office
302 The East Mall, Suite 600
Etobicoke, ON M9B 6C7

Hours of Operation : Monday to Friday 8:30 – 5:00 (EST)


T: 416-231-2100
F: 416-231-2107
Toll Free: 1-877-231-2122

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We respond to emails and voicemails within one business day.
For enquiries on certification program policies and procedures we will provide a response within 15 business days.