NPDES MS4 Program

The National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) Program is mandated under the federal Clean Water Act.  An NPDES MS4 permit is required for every MS4 owner or operator that with jurisdiction in a U.S. Census Bureau designated Urbanized Area.  It also applies to entities that are designated under state rules [15A NCAC 02H .0151]. 

MS4 News & Current Events

  • MS4 annual reporting time is rapidly approaching!  The 2021 annual reporting period is July 1, 2020 to June 30, 2021. See the Annual Self-Assessment page for more details.
  • MS4 permit files are available on the Stormwater Program Laserfiche Repository.
  • See the November 2, 2020 MS4 Program Update presentation for the current status of MS4 compliance and to learn what will be new in 2021.
  • Some MS4 communities are submitting Stormwater Management Plans (SWMPs) well in advance of their audits. The Audit Process page provides guidance for permittees who wish to submit SWMPs early.
  • Additional entities will likely be designated for coverage under a NPDES MS4 permit after the 2020 Census data has been processed.  DEQ expects to receive data in 2021 and publish designations in 2022.
  • Feel free to use DEQ's MS4 Program Overview Presentation if you need to explain the MS4 program to elected officials or other local audiences.
  • Electronic payment of annual permit fees is convenient and quick! Click on "Stormwater ePayments" on the lower right corner of this page. There is no fee for eCheck. The convenience fee for a credit card is 2.65% and the convenience fee for a debit card is $3.95. 

Who Can Sign MS4 Documents?

40 CFR 122.22 sets forth who can sign MS4 applications and reports.  For MS4 communities, permit documents must be signed by the Mayor or the City/Town Manager or a delegated individual.  A Mayor or City/Town Manager may delegate an individual using the Stormwater Delegation of Signature Authority Form

After completing the Stormwater Delegation of Signature Authority Form, scan and email it to Jeanette Powell and mail the original, hard copy to the Stormwater Program, attn: Jeanette Powell, 1612 MSC, Raleigh, NC 276990-1612.

How to Update Permit Data

Please check to make sure that your permit information is correct by entering your stormwater permit number into the Stormwater Permit Summary Report and reviewing the information there.  To update the:

MS4 Audit Schedule

Per EPA requirements, DEQ is required to audit 20% of MS4 permittess each year. See the MS4 Audit Schedule.


      Contact Jeanette Powell, MS4 Program Coordinator.