In order for your laboratory to perform drinking water tests in Ontario, it must be accredited to the international standard ISO/IEC 17025:2005 by an internationally recognized accrediting body.
Currently, the Standards Council of Canada (SCC) and the Canadian Association for Laboratory Accreditation (CALA) are the official accrediting bodies.
For more information and to see a full list of accredited laboratories that can test for Ontario Drinking Water Standard parameters, visit or contact:
If you would like a copy of licensed drinking water testing methods, send your written request to:
Ministry of the Environment
Laboratory Services Branch
125 Resources Road
Toronto, ON M9P 3V6
Attention: Director's Office (DW Methods Request)
If you would like a copy of the SCC or CALA final drinking water testing audit reports, contact the Ministry of the Environment’s Laboratory Licensing Administrator at 416-235-6370.
Need more help? Contact the Ministry of the Environment’s Laboratory Licensing Administrator at 416-235-6370.