There may be state-specific requirements depending on your location. For example, projects that involve soil disturbance of one or more acres or that are located in the New York City Watershed east of the Hudson River and disturb greater than 5,000 square feet will require the preparation of a Stormwater Pollution Prevention Plan (SWPPP). They will also require coverage under the State Pollutant Discharge Elimination System (SPDES) General Permit for Discharges from Construction Activity. A SWPPP may also be required by the local municipality if disturbing less than one acre.