The Association for the Protection of Lake Achigan (APLA) has been working since 1964 for the ecological preservation of the lake and its watershed, a fragile ecosystem facing several major environmental challenges.

1. Water quality and eutrophication

One of the central concerns is the lake's water quality: the accumulation of nutrients (such as phosphorus and nitrogen), often originating from wastewater or agricultural and urban runoff, can accelerate the eutrophication process. This process promotes the excessive proliferation of algae and aquatic plants, reducing water clarity, altering species habitats, and limiting recreational use of the lake.

2. Biodiversity and invasive species

The lake's biodiversity is another priority. The spread of invasive aquatic species, such as Eurasian watermilfoil, threatens native species by disrupting habitats and altering ecological interactions. Preventing their introduction and spread is essential to maintaining a balanced and diverse ecosystem.

3. Human impact on the watershed

Human development around the lake is leading to increased human impact on the watershed: deforestation of the shorelines, soil sealing, residential developments, and agricultural practices influence water runoff, increase the input of sediments and contaminants, and promote erosion. These changes directly affect the health of the lake and the quality of its environment.

4. Seasonal pressures and human activities

Even in winter, when the lake is frozen, human activities continue to have an impact: excessive use of salt to clear surfaces, the deposit of sand or debris on the ice, and the presence of domestic animals without proper management can contribute to the deterioration of water quality when the snow melts.