The Canadian regulatory authority, the Pest Management Regulatory Agency (PMRA) concluded in 2004 that the use of atrazine did not entail an unacceptable risk to human health, provided that the required mitigation measures were implemented.
The Federal-Provincial-Territorial Committee on Drinking Water has established a Guideline for Canadian Drinking Water Quality for atrazine and its by-products, as an Interim Maximum Acceptable Concentration of 5 micrograms per litre of drinking water.
The Canadian Water Quality Guideline for the Protection of Aquatic Life for atrazine is 1.8 micrograms per litre of water.
The interim Canadian water quality guideline for atrazine in irrigation water was adopted from the U.S.
Environmental Protection Agency’s water quality guideline (USEPA 1977). The interim Canadian water quality guideline for atrazine in livestock water was developed according to the CCME protocol (CCME 1993).