Morrisville, North Carolina
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Stormwater Hotline
Stormwater Hotline:  919.463.S0AK (7025) 

Please report illegal dumping into the storm drainage system or streams.

Flood Map Updates

Flood Map Updates

NPDES Phase II Permit

The National Pollutant Discharge Elimination System (NPDES) program, established under section 402 of the Clean Water Act of 1972, provided the framework to regulate point sources of pollutants to receiving streams. The NPDES program established a comprehensive two-phase approach to managing stormwater discharges. Phase I of the program required permits for municipal separate storm sewers (MS4s) serving populations greater than 100,000 people and for stormwater discharges associated with industrial activities. Phase II requirements of the NPDES program applied to all non point source discharges of stormwater from small MS4s with populations less than 100,000. Implementation of the NPDES phase I and II permitting program was delegated to the NC Department of Environmental Quality  (NCDEQ), which designated that Morrisville be brought into the program as an owner of an MS4. Morrisville received their Phase II permit from NCDEQ in November of 2005, which must be renewed every five years.

To meet the conditions of its Phase II permit, Morrisville was required to develop and implement a stormwater management program that includes the following minimum control measures (MCMs):
  • Public Education & Outreach 


  • Public Involvement and Participation 


  • Illicit Discharge Detection & Elimination 


  • Construction Site Stormwater Runoff Controls 


  • Post-Construction Stormwater Management


  • Pollution Prevention & Good Housekeeping 

    In addition to the Phase II program, the stormwater division also implements the following programs:

  • Riparian Buffer Program

  • Floodplain Management 


    the heart of the triangle
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