Greenburgh, NY Environmental Rules: Stormwater Management (2026)

L. No. 4-2008, makes the Town of Greenburgh responsible for its municipal separate storm sewer system (MS4) permit under the federal NPDES program and the state SPDES program. Section 248-8 bars anyone from starting a land development activity, major or minor, involving 500 or more square feet without first getting a stormwater management control permit from the Town Engineer; major activities additionally require a stormwater pollution prevention plan (SWPPP) prepared by a licensed engineer, architect, landscape architect or soil scientist before the permit issues. Section 248-6 exempts disturbances under 500 square feet, agricultural and silvicultural activity (except landing areas and log haul roads), routine maintenance under 500 square feet, home gardening, cemetery graves, fence and pole installation, and subdivisions or building permits approved before the chapter's effective date.

For minor projects, Section 248-9 requires the applicant to size stormwater controls to a minimum twenty-five-year design storm, choose between the Rational Method or TR-55 depending on watershed size, and keep infiltration devices at least 20 feet from a subsurface wastewater treatment system and 100 feet from any water well, wetland or water body when serving roadways or parking lots; the permit expires 180 days after approval if no building permit is issued and it isn't renewed by the Town Engineer. L. No. 2-2025, separately prohibits illicit discharges and illicit connections to the MS4.

Applicants must escrow $5,000 under Section 248-25 to cover Town review, inspection and maintenance costs unless the Town Engineer sets a lower amount, and unused escrow is returned within 60 days of proof of compliance.