The Ontario Water Wastewater Certification Office (OWWCO) is operated by HR Associates Incorporated and provides administrative and evaluation services to assist the Ontario Ministry of the Environment, Conservation and Parks with:

• the classification of drinking-water subsystems, and certification and re-certification of drinking-water operators and Water Quality Analysts under the Certification of Drinking Water Operators and Water Quality Analysts Regulation of the Safe Drinking Water Act (O. Reg. 128/04);
• the classification of wastewater facilities, and the licensing and re-licensing of wastewater operators under the Licensing of Sewage Works Operators Regulation of the Ontario Water Resources Act (O. Reg. 129/04); and,
• the approval of training courses to meet annual training requirements under O. Reg. 128/04.