This page, in the French section of the Ville de Mont-Tremblant website, provides a number of links to other pertinent sites. The links provide access to Ville policies and to extensive information about area lakes and watercourses, about water and maintenance of water health. There are pertinent maps, reports on area lakes, information pieces on blue-green algae, sites of local and regional organizations and of Québec government ministries, bylaws about the use of potable water and of water meters, and so on. The information is largely in French; some sites have English sections and some of the French reports have easily understandable numbers.
If you have specific questions about water quality and its maintenance and cannot find the information you seek, please contact the Department of the Environment of the Ville de Mont-Tremblant.
The contact information for that department is in the section "Our contact information" on this site.