Unified Stormwater Rule

The Unified Stormwater Rule (USWR) will change requirements for how stormwater is managed on new and redevelopment properties in NYC. For information about the local law that gives us the authority to develop and implement a USWR, go to Intro. 1851.

The proposed USWR will require updated stormwater quantity and flow rates for Site Connection Proposals and House Connection Proposals and a retention-first approach for projects that need MS4 Construction Permits. We are also drafting a new stormwater design manual to provide requirements and comprehensive guidance for permittees.

Visit Green Infrastructure and Municipal Separate Storm Sewer System to learn more about our programs for sustainably managing and reducing pollutants in stormwater runoff.