GGR Consulting, LLC
NPDES Stormwater and Environmental Consulting and Training 

NPDES Stormwater

The US Environmental Protection Agency describes the NPDES Stormwater Program as:

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. 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 program is designed to prevent stormwater runoff from washing harmful pollutants into local surface waters such as streams, rivers, lakes or coastal waters through the use of Best Management Practices (BMPs).

Most states are authorized to implement the NPDES Stormwater Program and administer their own stormwater permitting programs. EPA remains the permitting authority in a few states, territories and on most tribal lands. For these areas, EPA provides oversight and issues stormwater permits.

EPA website link for State Authorizations (page will open in a new window).

The NPDES Stormwater Program covers the following types of stormwater discharge activities:
  • MS4s (Municipal Seperate Storm Sewer Systems) - Operators of large, medium and regulated small MS4s may be required to obtain authorization to discharge stormwater.
  • Construction - Operators of construction sites that are one acre or larger (or sites that are less than one acre that are part of a large common plan of development or sale that ultimately will disturb one or more acres of land) and have the potential to discharge to a regulated receiving water may be required to obtain authorization to discharge stormwater under an NPDES construction stormwater permit.
  • Industrial - Certain regulated Industrial activities that can discharge stormwater associated with industrial activity to a regulated receiving water may require authorization under an NPDES industrial stormwater permit for stormwater discharges.   
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