Madam Speaker, the Government of Canada shares the member's view on the importance of protecting the health of Canadians and ensuring that our drinking water is safe. As we know, the presence of bacteria, viruses and protozoa in drinking water represents the greatest risk to human health from drinking water. The Walkerton tragedy and the North Battleford incidents are clear evidence of this.
All governments, both nationally and internationally, recognize that the elimination of these microbiological contaminants is the top priority in treating drinking water. Chlorine and other disinfection techniques, along with good management practices, eliminate this risk.
There are potential health risks, including cancer, associated with disinfection techniques. These risks, from long term exposure to relatively high levels of disinfectant byproducts, have been documented in numerous scientific studies such as the 1995 study entitled, “Great Lakes Basin Cancer Risk Assessment”.
Our objective is and will continue to be to reduce the severity of these risks to the health of Canadians or to eliminate them altogether.
I would first like to make it clear that Health Canada and its provincial and territorial partners, represented on the committee on drinking water, developed the guidelines for Canadian drinking water quality as the basis for ensuring the safety of drinking. A focus of their work is developing guidelines for disinfectant by-products including these associated with chlorine.
The existing and proposed guidelines are protective of human health. In addition, the application of the guidelines is designed to minimize the formation of by-products. This includes applying additional treatment processes to remove the organic matter that would react to the chlorine to form by-products.
Second, it is important to understand that other treatment processes, such as UV radiation or ozonation, are increasingly encouraged and used in new and modernized treatment plants across Canada, like in other countries around the world.
It is important to understand that the use of ozone or UV does not eliminate the need for chlorine or related chemicals to be used as a secondary disinfectant that will work throughout the distribution system. Ozone and UV are effective at the treatment plant, but do not prevent subsequent growth of microorganisms in the water as it is held and transported through the distribution system to people's homes. It is always necessary to use chlorine or a similar chemical to maintain a residual disinfectant in the distribution system.
In addition, ozonation is known to also create disinfectant by-products which can pose health risks. While UV is an excellent and relatively new technology for treating water, its effectiveness and efficiency are greatly reduced by the presence of high levels of organic matter in the source water.
Third, we must no longer rely on treatment alone. All governments nationally and internationally are adopting multi-barrier approaches for protecting drinking water.
This source to tap approach means protecting water sources to avoid drinking water contamination, or cleaning up existing pollution, which is one of the main objectives of the Great Lakes water quality agreement.
Provinces, territories and the federal government have endorsed this comprehensive approach and are putting it in place. A good example is Ontario's development of source water protection plants and initiatives under the Canada-Ontario agreement.
In summary, the quality of Canada's drinking water is among the best in the world but more remains to be done to ensure that it is protected in the future.