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EBR Decision Notice on Ontario’s Drinking Water Quality Standards, Testing and Reporting Requirements

The Ministry of the Environment and Climate Change has approved changes to Ontario Regulations 170/03 and 169/03. The details of the changes can be found in the EBR Decision Notice.

The amendments:

  • Strengthen standards for arsenic, carbon tetrachloride, benzene and vinyl chloride;
  • Adopt new standards for chlorate, chlorite, 2-methyl-4-chlorophenoxyacetic acid (MCPA) and haloacetic acids (HAAs);
  • Clarify/optimize testing, sampling and reporting requirements for trihalomethanes (THMs) and HAAs; and
  • Remove 13 pesticides from testing requirements.

In December 2014, the ministry posted the Technical Discussion Paper on Proposed Drinking Water Quality Standards to the Environmental Registry. Based on the comments received, the ministry updated the proposal and posted the revised version on both the Environmental Registry and the Regulatory Registry in August 2015 for public feedback.

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