Who may prepare a stormwater plan in South Carolina

South Carolina requires a credentialed preparer only in some cases. Sites above 2 acres.

What triggers it: Sites above 2 acres.

Gate is acreage-tiered, not flat. Sites disturbing 2 acres or less, not part of a larger common plan of development, have no named-credential requirement to prepare the C-SWPPP (a Coastal Zone carve-out at Section 3.1.2.D pulls some sub-2-acre sites near a coastal receiving water into the same gated requirement). Above 2 acres, the C-SWPPP must be prepared, certified and stamped by one of the four routes above — no CPESC/CEPSCI route exists for this design/stamp role, correcting and confirming this dataset's prior 'CPESC not accepted as signer' finding. A narrower, genuinely mandatory PE-seal requirement applies only where the site is both subject to Regulation 72-400 and disturbs 5+ acres; exactly what triggers 72-400 applicability was not independently confirmed (it appears tied to permanent stormwater/dam-safety-linked structures). Routine inspections are a separate obligation from SWPPP preparation: Section 4.2.E allows the C-SWPPP preparer, someone with equivalent registration, someone they directly supervise, or a person certified through an SCDES-approved Construction Site Inspector Certification Course (Clemson's CEPSCI is the recognized course) — stateCourseRequired is false because that course is one of several qualifying options for inspection, not a mandatory single path, and does not confer SWPPP-preparation authority.