Stormwater Management Program

Attention Residents & Businesses

A DPW Stormwater Permit may be required if you are conducting any type of work that disrupts the soil, either on private or public property. Contact Code Enforcement at 914-422-1208 prior to beginning any project to ensure compliance and prevent any disruptions in your work schedule.

Stormwater Management Application Form (PDF)

What is Stormwater?

Stormwater runoff is generated when precipitation from rain and snowmelt events flows over land or impervious surfaces and does not percolate into the ground. As the runoff flows over the land or impervious surfaces (paved streets, parking lots, and building rooftops), it accumulates debris, chemicals, sediment or other pollutants that could adversely affect water quality if the runoff is discharged untreated. The primary method to control stormwater discharges is the use of Best Management Practices (BMPs).

In addition, most stormwater discharges are considered point sources and require coverage under an NPDES permit.

Stormwater Basic Information

What is the NPDES Stormwater Program?

The National Pollutant Discharge Elimination System (NPDES) Stormwater Program regulates stormwater discharges from three potential sources:

MS4s - Operators of large, medium and regulated small MS4s may be required to obtain authorization to discharge stormwater.

Most stormwater discharges are considered point sources, and operators of these sources may be required to receive an NPDES permit before they can discharge. This permitting mechanism is designed to prevent stormwater runoff from washing harmful pollutants into local surface waters such as streams, rivers, lakes or coastal waters, i.e. Long Island Sound.

MS4 Toolbox

According to the federal law commonly known as Stormwater Phase II, permits are required for stormwater discharges from Municipal Separate Storm Sewer Systems (MS4s) in urbanized areas and those additionally designated by the Department. Owners or operators of such MS4s must be authorized in accordance with the State Pollutant Discharge Elimination System (SPDES) General Permit for Stormwater Discharges from Municipal Separate Storm Sewer Systems.