Both Canada and the U.S. maintain a national registry for the disclosure of chemicals used in hydraulic fracturing:
FracFocus.ca, built by the BC Oil and Gas Commission and conceived based on the American site, is an up-to-date resource for students and professionals in environmental sciences, earth sciences, and engineering, as well as members of the general public. Visitors to the Canadian site can discover the location of oil and gas wells and the chemicals used at each site in British Columbia and Alberta. From the FracFocus.ca Welcome Page: [FracFocus.ca] is a collaboration between provinces, territories, regulators and industry to provide Canadians with objective information on hydraulic fracturing, what legislation and regulations are in place to protect the environment including groundwater, and transparency on the ingredients that make up hydraulic fracturing fluids. Visit the site(s) to learn more.