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Background (Phase I)
Phase I of the Environmental Protection Agency’s (EPA) stormwater program was promulgated in 1990 under the Clean Water Act (CWA). It relies on the National Pollutant Discharge Elimination System (NPDES) permit coverage to address stormwater runoff.

Phase II
The Stormwater Phase II Final Rule is the next step in EPA’s effort to protect and improve water quality in the U.S. It expands the Phase I program by using NPDES permits to control polluted stormwater runoff through programs and practices. Phase II is intended to further reduce water quality degradation through the use of controls on nonpoint source runoff. Entities required to obtain a permit under Phase II include:

1.) “Small” municipal separate stormwater systems (MS4s) located within the boundaries of the Bureau of Census-defined urbanized areas (areas having a contiguous population of 50,000 or more and having an overall population density of at least 1,000 persons per square mile).

2.) Operators of construction sites disturbing between 1 and 5 acres of land.
The NPDES permitting authority in South Carolina is the Department of Health and Environmental Control (DHEC).

The six minimum control measures that are required in Phase II stormwater management programs include (1) public education and outreach, (2) public participation and involvement, (3) illicit discharge detection and elimination, (4) construction site runoff control, (5) post-construction runoff control, and (6) pollution prevention and good housekeeping.

   • EPA Phase II NPDES Stormwater Program
   • South Carolina DHEC NPDES Stormwater Program
   • The Stormwater Manager’s Resource Center
   • National Stormwater Best Management Practices (BMP) Database
   • North Carolina Department of Environment and Natural Resources
     NPDES Phase II Stormwater Program
   • Recommended Resources for Phase II (PDF document)
   • EPA National Menu of Best Management Practices for Storm Water Phase II



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