Municipal Separate Storm Sewer Systems (MS4s)


An MS4 is a conveyance or system of conveyances that is:

  • Owned by a state, city, town, village or other public entity that discharges to waters of the U.S.

  • Designed or used to collect or convey stormwater (e.g., storm drains, pipes, ditches)

  • Not a combined sewer

  • Not part of a sewage treatment plant, or publicly owned treatment works (POTW)

To prevent harmful pollutants from being washed or dumped into MS4's, certain operators are required to obtain NPDES permits and develop stormwater management programs (SWMPS). The SWMP describes the stormwater control practices that will be implemented consistent with permit requirements and to minimize the discharge of pollutants from the sewer system.

Draft 2024 MS4 General Permit

Draft WV/NPDES WV0116025 MS4 General Permit and Fact Sheet.

TMDL 303(d)

The following 303(d) / TMDL data is provided to the permittees as per EPA requirements.

Berkeley County Public Service Stormwater District WVR030019

City of Beckley - Beckley Sanitary Board WVR030009

City of Benwood WVR030026

City of Bluefield - Bluefield Sanitary Board WVR030008

City of Ceredo WVR030014

City of Charleston WVR030006

City of Clarksburg WVR030034

City of Dunbar - Dunbar Sanitary Board WVR030031

City of Fairmont WVR030038

City of Follansbee WVR030018

City of Glen Dale WVR030024

City of Hurricane - Storm Water Board WVR030010

City of Kenova WVR030039

City of Marmet WVR030037

City of Martinsburg WVR030017

City of McMechen WVR030036

City of Montgomery WVR030007

City of Moundsville - Moundsville Sanitary Board WVR030013

City of Mount Hope WVR030055

City of Nitro WVR030027

City of Oak Hill WVR030049

City of Parkersburg WVR030029

City of South Charleston WVR030001

City of St. Albans WVR030005

City of Vienna WVR030032

City of Weirton WVR030021

City of Wellsburg WVR030028

City of Westover WVR030022

City of Wheeling WVR030016

City of Williamstown WVR030020

City of Winfield WVR030052

Fairmont State University WVR030045

Huntington Stormwater Utility WVR030033

Marshall University WVR030043

Morgantown Utility Board WVR030030

Town of Belle WVR030015

Town of Chesapeake WVR030040

Town of Clendenin WVR030054

Town of Eleanor WVR030053

Town of Fayetteville WVR030050

Town of Mabscott WVR030059

Town of Milton WVR030003

Town of Poca WVR030035

Town of Sophia WVR030051

Town of Star City WVR030023

Veterans Administration Beckley Medical WVR030048

Village of Barboursville WVR030011

Village of Bethlehem WVR030025

West Virginia State University WVR030044

West Virginia University WVR030042

WV Department of Transportation WVR030004

WV Turnpike Authority WVR030041

WV/NPDES General Permit Number WV0116025

  • Extended Filtration Memo

    The purpose of this Memorandum of Understanding is to clarify language in the WV MS4 general permit issues on June 22nd, 2009 that allows stormwater discharges to occur via underdrains in extended filtration facilities.

The reissued Municipal Separate Storm Sewer System (MS4) General Permit was issued July 11, 2014 and becomes effective August 11, 2014. The MS4 General Permit covers stormwater discharges from small regulated urbanized areas as well as public institutions such as hospitals, universities, highways within urbanized areas, and prisons.

The regulatory definition of an MS4 (40 CFR 122.26(b)(8)) is "a conveyance or system of conveyances (including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, man-made channels, or storm drains):

  1. Owned or operated by a state, city, town, borough, county, parish, district, association, or other public body (created to or pursuant to state law)...including special districts under state law such as a sewer district, flood control district or drainage district, or similar entity, or an Indian tribe or an authorized Indian tribal organization, or a designated and approved management agency under section 208 of the Clean Water Act that discharges into waters of the United States.
  2. Designed or used for collecting or conveying stormwater.
  3. Which is not a combined sewer.
  4. Which is not part of a Publicly Owned Treatment Works (POTW) as defined at 40 CFR 122.2.

Municipalities and other entities that are regulated under the WV small MS4 general permit are required to develop and implement stormwater management programs. These stormwater managment programs include six measures that help to protect and restore water quality from polluted runoff.


Jeff Smith, Environmental Resource Specialist 3
West Virginia Department of Environmental Protection
Division of Water and Waste Management
601 57th Street, SE
Charleston, WV 25304
Phone: (304) 926-0499 x43764