The Walkerton Inquiry was an independent Commission set up to examine the contamination of the water supply in Walkerton, Ontario, in 2000 by E.Coli bacteria and to look into the future safety of the water supply in Ontario.

The Commission was established on June 12, 2000, by the Government of Ontario under the Public Inquiries Act. Dennis R. O'Connor, a Justice of the Court of Appeal for Ontario, was appointed Commissioner. Its findings, conclusions and recommendations were delivered to the Attorney General of Ontario in 2002.

The Walkerton Inquiry website has been archived by the Archives of Ontario.

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