The chemical treatments and other organic matter on your lawn have the potential to be swept into Lake Minnetonka either directly or through storm drainage systems. By being mindful of your lawn treatment decisions, you can eliminate some chemical run-off that degrades the quality of the Lake.
High levels of phosphorus in a lake increase the severity of algal blooms. When selecting fertilizers for your yard, look for Phosphorus-Free products. In Minnesota, fertilizers containing phosphorus cannot be used on lawns and turf unless the use falls under a small number of exceptions. Learn more about the Phosphorus Lawn Fertilizer Law.
- Follow product instructions. Consult product packaging on how much fertilizer to apply and how often.
- Check the weather. Do not fertilize before a storm.
- Schedule your fertilizer application for maximum effectiveness. For the best results, apply fertilizer in the fall. Do not apply fertilizer to frozen ground.
Other Potential Pollutants
Even natural debris, such as eroded soil, leaves, grass clippings and pet waste, can be a polluting source of phosphorus when it ends up in the water. Be sure to bag or otherwise contain these items to prevent them from being swept away by stormwater.