Tests for health-related parameters must be conducted by a laboratory that is accredited to perform these tests. Tests for operational parameters can be performed by licensed operators at the waterworks. Laboratories are also required to provide the Ministry of the Environment with analytical data. Minimum level of treatment Disinfection of water to eliminate disease-causing organisms is the most important step in the drinking water treatment process. This is consistent with the most stringent practices in other parts of the world.
Disinfection is the minimum treatment for drinking water from a groundwater source.
An exemption from this requirement will only be considered if a waterworks meets certain rigorous conditions. The minimum treatment for drinking water from a surface water source is chemically assisted filtration and disinfection, or an equivalent treatment process. There are no exemptions. Waterworks must have an approved treatment process in place by December 31, 2002. Keeping the public informed Since Ontarians are entitled to know about the quality of the water they consume, waterworks owners are now required to produce and make readily available a free, quarterly report for the people to whom they supply drinking water.