State Stormwater Programs
There are multiple state-mandated "post-construction" stormwater management control programs. Use the Stormwater Permitting Interactive Map as a tool to help determine which, if any, of these requirements apply to your project location.
Express Review (only available for stormwater in the 20 coastal counties)
All structural Best Management Practices (BMPs) must follow design criteria described in the N.C. Stormwater BMP Manual. Required supplement forms for specific BMPs can be found at the BMP Manual link above.
The first State Stormwater Management Program began in the late 1980s under the authority of the North Carolina Environmental Management Commission (EMC) and North Carolina General Statute 143-214.7. This program, codified in 15A NCAC 2H .1000 & Session Law 2008-211, affects non-residential projects adding more than 10,000 sf of built upon area (20 coastal counties only); development activities that require either a Erosion and Sediment Control Plan (for disturbances of one or more acres), or a CAMA major permit within one of the following areas:
See this map of the 20 coastal counties and the ORW and HQW areas.
In addition, residential development activities within the 20 coastal counties located within 1/2 mile and draining to class SA waters that disturb less than 1 acre must apply for the General Permit SWG050000 if: adding more than 10,000 sf of built upon area that will result in a built upon area greater than 12%.
In 2007, Session Law 2006-246 expanded stormwater post-construction control requirements into designated Phase II areas, beyond those cities with NPDES Phase II MS4 permits. These areas include certain "tipped counties" , and unincorporated areas that fall within urbanizing areas and "municipal spheres of influence" (MSI) around Phase II cities and towns. This law significantly expanded the area in which NC DEMLR must issue State Stormwater permits for development (see this PDF map of Phase II areas). In 2012, this program was codified in 15A NCAC 2H .1000. Note that some tipped counties are coastal counties where the Coastal Stormwater Rules apply (see the Coastal & HQW/ORW tab above).