The problem:Yard waste (such as grass clippings, leaves and dirt) get into the storm drain system. This can clog the system and cause floods, and harm aquatic wildlife.
What you can do:
Leave the height of your grass long when mowing and leave clippings on your lawn to decompose. "Grass-cycling" is a great source of nitrogen and saves water and fertilizer (which also saves you money).
Look into composting. You can compost leaves, yard debris, and non-meat food scraps. They make great soil for the garden.