SWPPP inspection requirements for South Carolina construction sites

A Stormwater Pollution Prevention Plan is not a one-time filing. It is an active compliance document that must be updated and supported by a consistent inspection record throughout the life of a permitted construction project. Understanding what the SCDHEC Construction General Permit requires for SWPPP inspections is the starting point for building a record that holds up when SCDHEC shows up on site.

The SCDHEC Construction General Permit sets two independent inspection clocks. A qualified inspector must inspect the site at minimum once every seven calendar days during active land disturbance. Separately, an inspection is required within 24 hours of a rainfall event measuring 0.5 inches or greater at the site.

These two schedules run independently. A rain event inspection does not reset the weekly schedule. A site that receives a 0.8-inch rain on Tuesday must have a rain event inspection by Wednesday and still must be inspected by the end of the seven-day window from the last routine inspection. During active construction in South Carolina's spring and summer months, a site can easily require six to eight inspections in a single month.

South Carolina requires that SWPPP inspections be conducted by a Certified Erosion Prevention and Sediment Control Inspector, known as a CEPSCI. The CEPSCI certification is issued through the SC Land Resources Conservation Commission. It requires passing a written exam and completing continuing education to maintain active status.

The qualified inspector of record is responsible for conducting the inspection and signing the inspection record. Drone documentation subcontractors provide aerial imagery and written condition summaries but do not serve as the inspector of record. The CEPSCI reviews the deliverables and signs the completed inspection entry.

An inspection under the CGP is not a general site walkdown. The inspector must assess the condition of every BMP installed on the site: silt fence, sediment basins and traps, inlet protection at all drop inlets and curb inlets, stabilized construction entrances, slope stabilization measures, and any areas where active erosion is occurring.

For each BMP location, the inspection record must document the condition found (functioning as designed, deficiency noted, or corrective action required) and, where a deficiency or corrective action is noted, the specific problem and the corrective action taken or scheduled. Corrective actions must be completed within seven calendar days of the inspection that identified the deficiency, or sooner if SCDHEC requires.

The inspection record must be kept on site or immediately accessible and made available to SCDHEC inspectors on request. A complete record includes the date of each inspection, the name and CEPSCI certification number of the inspector, the condition of each BMP assessed, any corrective actions taken, and the date those corrective actions were completed.

Photographs are not explicitly required by the CGP, but they are the most reliable way to document BMP condition at the time of inspection. A dated photo set organized by BMP type and location provides a timestamped record that supports the written inspection entry if SCDHEC questions whether a BMP was functioning as designed on a particular date.

SWPPP inspections are required from initial land disturbance through final stabilization. Under the SCDHEC Construction General Permit, final stabilization means 70% permanent vegetative cover on all areas of the site that were disturbed, or permanent pavement or concrete over all disturbed ground. Until that threshold is met, the inspection schedule continues.

Sites that reach final stabilization on a phased basis, where one section of the site achieves 70% cover while another is still active, must continue inspections for the active sections. The inspection record should note which areas have reached final stabilization and which remain under the active inspection schedule.

Environmental consultants and CEPSCI inspectors managing multiple permitted sites often find that the 7-day clock and rain event triggers are the hardest part of the schedule to maintain during peak construction season. A site that covers 40 or more acres requires more time per inspection than a smaller site, and the 24-hour rain event window leaves little scheduling flexibility.

Drone documentation covers the full perimeter and all interior BMP locations in a single flight, with deliverables organized by BMP category and GPS-tagged for each location. The inspector reviews the aerial record, conducts any necessary ground-level follow-up on flagged areas, and signs the inspection entry. For consultants managing eight to twelve active sites simultaneously, that division of labor is what keeps the inspection record current.

SC Drone Services covers construction sites across South Carolina. Rain event inspections are available same-day across most of the state. For Upstate SC sites, drone inspections are handled by our Upstate partner, Upstate Drone Services.