Storm Water Management Committee - MS4

This page is provided so the public can easily access Milton’s Stormwater-related plans, permits, public educational messages and other useful information about protecting our town's water resources.

For illicit discharge complaints, please contact 603-652-4501 

Municipal Separate Storm/Sewer System (MS4)
 

WHAT IS AN MS4 PERMIT AND WHY MILTON?

Local drainage systems, whether natural or constructed, are important features that generally carry stormwater runoff away from developed areas to undeveloped areas, waterbodies, and wetlands. Although these drainage systems help to manage stormwater in our built environment, they are also a primary source of untreated pollutants in receiving waters including bacteria, nutrients oil, trash, and many other pollutants. These untreated pollutants in stormwater runoff are defined by the U.S. Environmental Protection Agency (EPA) as “nonpoint source pollution”, meaning that the source of the pollution is not directly attributable to a single spatial point or polluter. Stormwater runoff from streets, parking lots, and lawns picks up and carries contaminants as it moves across the ground surface before entering into local drainage systems.

A municipal separate storm sewer system (MS4) includes the stormwater collection, conveyance, and outfall structures within a city or town. These structures include (but are not limited to) catch basins, drain manholes, culverts, stormwater basins, and swales. As with approximately sixty other municipalities in NH, the Town of Milton’s MS4 is regulated under the EPA Clean Water Act (CWA) and requires a permit for discharges to the environment.

MS4 Maps

1. Milton MS4 Maps July 2021

Important Documents to Review

1.  MS4 Organizational Chart
2. Storm Water Management Program