South Carolina Code of Regulations
Chapter 27 - CLEMSON UNIVERSITY STATE LIVESTOCK-POULTRY HEALTH COMMISSION
Article 17 - SOUTH CAROLINA PESTICIDE CONTROL
Section 27-1090 - Definitions [applicable to Backflow Prevention Act, Chemigation Act]

A. "Anti-Siphon Device" means any equipment designed to prevent backflow of chemicals into any water supply.

B. "Check Valve" means a device effectively designed and constructed to provide an absolute closure which prohibits, when operation of the irrigation system pump ceases, the flow of material past the closure point of the valve in the opposite direction of the pumping of water.

C. "Chemical" means any pesticide or fertilizer or any other substance defined as a chemical under Chapter 13 and under Chapter 25 of Title 46 of the 1976 S. C. Code or under appropriate federal statutes, or any other chemical applied to agricultural crops, nursery, turf, golf course, greenhouse sites, or land through irrigation equipment.

D. "Chemigation" means any process whereby chemicals are applied to land and or agricultural commodities including, but not limited to: agricultural crops, nursery, turf, golf course or greenhouse sites, through an irrigation system. Irrigation systems connected to public water supplies are regulated under the South Carolina Department of Health and Environmental Control's State Safe Drinking Water Act and State Primary Drinking Water Regulations and must meet the requirements in these statutes in lieu of the Chemigation law or regulations. Exceptions or alternative chemigation safety equipment approved in writing by the Environmental Protection Agency or the Director are the only substitutions allowed.

E. "Chemigator" means any person owning and/or operating a chemigation system.

F. "Director" means the Director of Regulatory and Public Service Programs, Division of Agriculture and Natural Resources, Clemson University.

G. "Low Pressure Drain" means a self-activated device designed and constructed to automatically drain that portion of the irrigation pipe when the water pressure drops due to check valve malfunction. This prevents contamination of the water source.

H. "Injection Pump" means the equipment used to pump chemicals into the irrigation line.

I. "Interlock" means a mechanical or electrical connection between the injection pump and the irrigation pump such that, if the irrigation pump should cease to function, the injection pump also ceases to function.

J. "Irrigation System" means any device or combination of devices that convey water from any source of ground or surface water through hoses, pipes, or other such methods to agricultural crops, nursery, turf, golf course, greenhouse sites, or land.

K. "Vacuum Breaker" means a device designed and constructed to automatically relieve the vacuum in an irrigation pipeline.