How Can Fallen Leaves Be Bad for Water Quality?

Issues arise due to the tremendously altered landscape which boasts ever-increasing amounts of impervious or “waterproof” surfaces that quickly and easily move leaves, and their nutrients, into nearby water bodies.

Leaves are biodegradable, meaning they naturally decompose and return nutrients such as phosphorus and nitrogen to their surroundings. During rain events, fallen leaves pile up on streets and storm drains. When left there, the nutrients break down and enter our freshwater instead of the soil. Excessive nutrients in freshwater can result in harmful and unwanted algae growth, which reduces the amount of oxygen in the water and kills aquatic life.

Composting

Gather leaves from your yard or storm drain and place them in a compost pile. Take advantage of the breakdown processes and capture excess nutrients for fertilizer use. Some species of leaves like black walnut contain a growth inhibitor. For these species, use a fast composting recipe. Learn more about composting and find recipes here.

Mulching

Mulch your leaves by mowing over them. This will shred the leaves allowing them to be less visible and decompose faster. As the leaves break down, they release nutrients including Nitrogen, Phosphorus, and Potassium serving as natural fertilizer. Not only will your yard thank you, but so will our waterways. 

Collecting

Bag up, pile, and contain leaves - Check your Municipality’s website to determine where, when, and how to properly dispose of leaves, especially if offered curbside pile pickup. To safeguard against leaves going down the storm drain, bag them shortly before collection time. Click here for a handy guide.

disposing

Municipalities may have different leaf disposal guidelines and services offered including leaf pick ups. Check your municipality’s website to determine pick up or drop off opportunities, and be stormwater smart by following these simple steps.