Green Stormwater Infrastructure Investment Act

This bill amends the Federal Water Pollution Control Act (commonly known as the Clean Water Act) to assist state, tribal, and local governments toinvest in green stormwater infrastructure.Green stormwater infrastructure is a stormwater management technique that uses natural or engineered systems designed to promote the uptake and filtration of stormwater at its source to protect habitats and reduce flood risks.

The bill establishes a 20% reserve within each state's Water Pollution Control Revolving Fund for installation, operation, and maintenance of green stormwater infrastructure.

The Department of Transportation must prioritize projects that include green stormwater infrastructure for competitive federal transportation infrastructure grants.

The bill also authorizes the Environmental Protection Agency to extend National Pollutant Discharge Elimination System permits for green stormwater infrastructure systems for up to 10 years.