Municipal Separate Storm Sewer System Permit (MS4)

The Federal Clean Water Act requires Hanover County to have an MS4 permit.  Virginia Department of Environmental Quality (DEQ) issues MS4 permits for the state.

  • The permit covers the public system of pipes and ditches carrying rainfall from the urban areas to streams and creeks
  • Developed areas contain hard surfaces such as pavement and roof tops that increase stormwater runoff volume
  • Runoff and associated pollutants enter local streams through the storm sewer system faster than when the area was a natural forest or meadow
  • The permit is designed to reduce pollutants entering the storm sewer system