BMP inspections for construction sites in Anderson County, SC

Anderson County has a consistent volume of active construction along three main corridors: SC-28 between Anderson and Greenwood, SC-81 through the Williamston and Belton areas, and the I-85 interchange zone in the southern part of the county near Pendleton and Townville. Commercial build-out around the Hartwell Lake corridor and ongoing residential subdivision development throughout the county keep land-disturbing permit activity steady. All of this requires regular NPDES BMP inspection documentation under the SCDHEC Construction General Permit.

What the permit requires

Any construction activity disturbing one acre or more in South Carolina requires coverage under the SCDHEC Construction General Permit (CGP) and NPDES permit authorization. The CGP sets two inspection triggers that run independently: inspections must occur at least once every seven calendar days during active land disturbance, and an inspection is required within 24 hours following a rainfall event of 0.5 inches or greater. A rain event inspection does not reset the seven-day clock.

Inspections are required from initial land disturbance through final stabilization. Final stabilization in Anderson County's mixed commercial and residential context means 70% permanent vegetative cover on all disturbed areas not covered by hard surface. Until that standard is met, the inspection schedule is active even if structural work has started and grading is complete.

What gets documented

Every BMP on the site must be covered in each inspection: silt fence condition along the full perimeter, sediment basins and traps (levels, outlet conditions, overtopping), inlet protection devices at all drop and curb inlets, stabilized construction entrance condition, diversion berms and slope drains, erosion control blankets and seeding progress, and any areas of active erosion or BMP failure.

The inspection record must include the date and time of inspection, weather conditions, findings at each BMP location, and any corrective action taken or scheduled. Records go into the SWPPP and must be maintained for at least three years. SCDHEC inspectors verify that records are complete, dated, and consistent with current site conditions.

Anderson County enforcement context

SCDHEC stormwater enforcement applies uniformly across Anderson County, and the county's own stormwater program conducts independent site checks. A site with BMPs in good physical condition but without a complete, dated inspection record is still in violation. Documentation is what gets checked: the physical condition of the BMPs on the day of the SCDHEC visit matters, but so does the paper trail showing that inspections happened on schedule.

On Anderson County sites along the SC-28 and SC-81 corridors, the most common documentation issue is inspection records that don't cover the full site, particularly on sites where grading has created multiple separate drainage areas with BMP installations on each. A drone flight covers the entire site perimeter and all interior BMP locations in a single pass, producing a GPS-tagged record of each location on the date of the flight.

How drone inspections work on Anderson County sites

A drone covers a 40-acre site in 45 minutes and larger sites proportionally, with complete coverage of the perimeter silt fence, sediment basins, inlet protection, and any areas of slope instability. Based in Clemson, Anderson County sites are 20 minutes away. For GCs with active sites on the SC-28 or I-85 corridors, a weekly or bi-weekly BMP inspection flight keeps the inspection record current without pulling a superintendent for a ground walk. For consultants managing multiple Anderson County sites, aerial documentation allows more sites to be covered on a single inspection day.

Deliverables are GPS-tagged photos organized by BMP type and a written inspection summary, delivered within 48 hours and formatted for direct insertion into SWPPP inspection logs.

For the full NPDES inspection frequency requirements, see BMP inspection frequency requirements for construction sites in South Carolina.

For SWPPP consultants managing multiple Anderson County sites, see drone SWPPP inspection support for Anderson.

FAA Part 107 certified. Insured. Same-week scheduling for Anderson County.