Municipal Separate Storm Sewer Systems (MS4s)

Permit extended to February 11, 2021- click to view the extension letter


WV/NPDES General Permit Number WV0116025

Extended Filtration Memo

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):

(i) 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.

(ii) Designed or used for collecting or conveying stormwater;

(iii) Which is not a combined sewer; and

(iv) 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.



WV MS4 program contact:
Samuel "Jeff" Smith
Environmental Resources Specialist III
304-926-0499, ext. 43764





Photo of green roof at WVU in Morgantown, WV

One of four green roofs at West Virginia University, Morgantown.  This green roof is planted with sedums and was established in 2007.