On January 1, 2008, all septic system installers in the State of North Carolina are required to be licensed. This certification is broken down into four grade levels. Level I, II, III, IV. Each grade level is specific to the type of system that is permitted or gallons per day generated for the proposed home or commercial establishment. This grade level will be noted on the Construction Authorization issued by the Clay County Environmental Health Division.
Below is a link which contains necessary information for system installer certification, licensing, installer complaints, continuing education, and licensing renewal. The bottomcontains a list of certified installers by county.
Installer List by County: http://ncowcicb.info/forms/certifiedlistbycounty.pdf