Construction Site Stormwater Runoff Control - Minimum Control Measure #4

MCM 4 is Construction Site Stormwater Runoff Control. Construction sites are a significant contributor of sediment pollution that impacts rivers, lakes and estuaries. Sediment in waterbodies from construction sites can reduce the amount of sunlight reaching aquatic plants, clog fish gills, smother aquatic habitat and spawning areas, and impede navigation.

SMS4s are required to develop a program to reduce pollutants in stormwater runoff to the MS4 for construction sites disturbing one or more acres. Horry County’s program includes: an ordinance [link] and design manual [link] with requirements for stormwater management and erosion and sediment control best management practices at construction sites; construction site plan review; and inspections and enforcement procedures for construction sites. For information about US EPA requirements for Construction Site Stormwater Runoff Control, click here. For more information about Horry County's permitting process, click here.