Stormwater Management Program (SWMP)

NH Small MS4 General Permit


General Info

Lead Department: Engineering Division
Project Manager: Project Engineer

Project Details

Pursuant to the requirements of the Environmental Protection Agency (EPA)'s "National Pollutant Discharge Elimination System (NPDES) General Permit for Storm Water Discharges from Small Municipal Separate Storm Sewer Systems (MS4)" the Town is responsible for implementing and performing various items and activities related to stormwater management.

As an operator of an MS4, the Town is required to develop, implement, and enforce a Stormwater Management Program (SWMP). The SWMP is a 'living document' intended to be revised and updated as needed, but at a minimum, annually. The primary goals of the SWMP are to reduce the discharge of pollutants from the MS4 to the maximum extent practicable, to protect water quality, and to satisfy the appropriate water quality requirements of the Clean Water Act (CWA). To achieve these goals, the Town implements certain Minimum Control Measures (MCMs), which include:

The Town's progress regarding implementation of these MCMs, and the SWMP in general, is documented in Annual Reports submitted to both the EPA and the New Hampshire Department of Environmental Protection (NHDES). These Annual Reports are available for public viewing online (Salem MS4 General Permit Archives) or by visiting Town Hall.


Chapter 417 - Stormwater Managment Regulations

Revisions to Chapter 417 were adopted by Town Council on September 25, 2023.  These revisions incorporated addtional requirments to maintain compliance with the EPA mandated MS4 permit.