Don't let leaves litter lakes
What to do with leaves in the fall so they don't pollute water
But when there is no soil to land on — such as on a street or sidewalk — the leaves and all their decomposing bits wash down the street and into the storm drain. From there they go directly into lakes and rivers where the nutrients will feed unwanted algae growth next summer. In addition to a major "ick" factor, this algae is a problem because when it dies and decomposes at the bottom of the lake, it uses up oxygen that fish and native plants need.
In the Mississippi River-Twin Cities watershed 87 of the 180 lakes studied didn't meet water quality standards because of excess nutrients — that's about half the lakes! And leaves are a major source of the problem. Depending on the lake, leaves might account for 60% of the excess nutrients in these lakes.
Don't "leaf" it up to someone else to solve this problem! Here's what to do with your autumn leaves so that they nourish the soil and not unwanted algae.
Rake the leaves that have accumulated along your curb, sidewalk and alley
Several times during the fall, rake up the leaves that have accumulated along your curb and sidewalk. Street sweeping in late fall helps keep a lot of leaves from entering the water. If your city doesn't already do this, encourage them to start! By the time the street sweepers drive by, however, lots of decomposition and several rain storms may have occurred. You can help by raking 1-2 additional times. If you work with youth or community groups, consider organizing a community clean up for water quality to do this for others. Never rake leaves into the street, even when you know the street sweeper is coming.
Never trash or burn your leaves
Don't add leaves to the regular trash (it's illegal!) and don't burn them. Burning leaves releases large amounts of air pollution. These pollutants can cause breathing problems for sensitive groups and lead to long-term health effects for all of us.
Put leaves in your backyard compost pile
One of the best ways to use leaves (from the street or the yard) is to compost them in your backyard. Learn how to compost in your backyard.
Tip: If your bin isn't big enough to accommodate all your leaves, put early and late season leaves in the bin, then on your main raking weekend bring the rest to a compost or yard waste drop-off site. If you have room, also bag up and store some dry leaves to use as a carbon source ("browns") in your compost pile during the coming year.