When yard waste is swept, blown, or washed into the street and ultimately the nearest storm sewer, it ends up in local waterways, contributing excess nitrogen and phosphorus. These nutrients act as fertilizer, fueling the growth of aquatic weeds and increasing the likelihood and severity of noxious algae blooms, which are toxic to humans and animals. Additionally, the decomposition of excess weeds and algae in the waterways can use up the oxygen that fish and native plants need.
Yard waste and other debris can also clog storm drains and cause drainage and flooding issues. To prevent damage from localized flooding to streets and nearby properties, keep yard waste out of the curb and gutter line and clear off storm drains.