The Village of Ossining, NY
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                                                         STORMWATER MANAGEMENT


What is Stormwater?

Stormwater is the result of precipitation from rain, snowmelt, and other weather events that eventually makes its way into our surface waters, including the water we drink.  As it flows across impervious surfaces such as roads, sidewalks, parking lots, and driveways, stormwater runoff eventually makes its way into the Village's stormwater system.

Since the inlets to the stormwater system are located all around the Village, stormwater runoff can sometimes pick up substances such as:

  •  Fertilizers, pesticides, and lawn chemicals
  •  Gasoline, Oil and other hydrocarbons
  •  Trash and debris
  •  Sediment from construction sites
  •  Micro-organisms and bacteria

Why is polluted stormwater runoff an issue?

Untreated runoff can contain harmful substances that could adversely affect our water quality and the ecosystems located in and around our surface waters. Potential impacts of untreated runoff can include:

  • Habitat destruction and aquatic ecosystem damage
  • Water contamination, leading to reduced water quality
  • Erosion and increased sedimentation in water bodies

Below are some things you can do to help keep our waters clean.

If you are a homeowner:

Lawn Care

  • Minimize use of pesticides and lawn chemicals 

Click here for more information on Lawn Care Programs

Deicing Practices

  • Do not over salt and salt before it snows

Click here for more information on deicing  

 Household Chemicals

  • Make sure you dispose of your trash properly and use alternatives to hazardous household chemicals

Click here for more information on household chemical disposal and alternatives

 Car Maintenance

  • Wash your car on the lawn, rather than the driveway, or take it to the car wash
  • Keep your car in a state of good repair

Click here for more information on car maintenance

Water Conservation and Water Quality Landscaping

  • Garden with native and drought-resistant plants
  • Plant more trees and shrubs and avoid removal of existing plants and vegetation whenever possible

Click here for more Information on native plants

  • Clean up after pet waste

Click here for more information on pet waste

Educational brochures on tips for homeowners

Healthy Household Habits for Clean Water

MS4 Phase II Program

What is an MS4?

The acronym MS4 stands for Municipal Separate Storm Sewer System. This system is made up of ditches, curbs, gutters, storm sewers, and similar means of collecting or conveying runoff collected from impervious surfaces. The Village of Ossining's MS4 is subject to the EPA's regulations for Phase II Small MS4s and is permitted through the New York State Department of Environmental Conservation (NYSDEC). The Village is responsible for the maintenance of the MS4 as well as ensuring that all development taking place within the Village complies with NYSDEC regulations. The MS4 does not connect with a wastewater collection system or treatment plant eventually, the stormwater is discharged directly into surface waters, which include streams, rivers, lakes, and reservoirs.

The National Pollutant Discharge Elimination System (NPDES) Stormwater Program regulates stormwater discharges from three potential sources: municipal separate storm sewer systems (MS4s), construction activities, and industrial activities.  A federal regulation, commonly known as Stormwater Phase II, requires permits for stormwater discharges from Municipal Separate Storm Sewer Systems (MS4s) in urbanized areas and for construction activities. To implement the law, the New York State Department of Environmental Conservation has issued two general permits, one for MS4s in urbanized areas and one for construction activities.

Under Phase II, operators of regulated small municipal separate storm sewer systems (MS4s) are required to develop and implement a stormwater management program which includes the six minimum control measures:

Each MS4 municipality is also required to submit a stormwater management plan and an annual stormwater report.  Below is the latest stormwater plan and report.

Village of Ossining Updated Stormwater Management Plan

Village of Ossining 2015 Draft Stormwater Report

Village of Ossining 2014 Stormwater Report

VIllage of Ossining 2013 Stormwater Report

Village of Ossining 2012 Stormwater Report

Village of Ossining 2011 Stormwater Report

Village of Ossining 2010 Stormwater Report

Village of Ossining 2009 Stormwater Report

Each MS4 is required to map all of their storm sewer drainage systems and to have a map of the storm sewershed.  The map of the storm sewershed is below.  All storm sewer drianage mapping or data is available through the Department of Public Works at 914-941-4660 or at the Planning Department at 914-762-6232.  

Village of Ossining Storm Sewershed Map

As of January 2008 all MS4 municipalities were to have a Stormwater Management and Erosion and Sediment Control local Law adopted. Please see below:

Village of Ossining Stormwater Management and Erosion and Sediment Control Local Law

If you are a contractor:

Contractors must implement a Stormwater Pollution Prevention Plan (SWPPP) if the project meets the thresholds defined in Chapter 227 Stormwater Management and Erosion and Sediment Control Local Law of the Village Code.

See the links below for further information on the development of a SWPPP and the implementation of BMPs for construction sites.

To report a suspected Stormwater Violation: Please contact the Village Department of Public Works at (914)941-4660
Stormwater Management Resources

County Government Resources  

Stormwater Management

State Government Resources

NYS DEC Stormwater Management

State Stormwater Manuals

Federal Government Resources

EPA Stormwater Program

Developing your Stormwater Pollution Prevention Plan: A Guide for Construction Sites




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