Industrial Pretreatment Permits are required by the South Carolina Department of Health and Environmental Control (SCDHEC).   All industries that are “Categorical” (such as industries relating to Textile Mills, Metal Finishing, Organic Chemicals, Plastics & Synthetic Fibers, Aluminum Forming etc.), industries with effluent >5% of dry weather hydraulic or organic capacity of the Wastewater Treatment Facility (WWTF), industries with effluent > 25,000 gallons/day of process wastewater, or industries that have the potential to adversely affect the Wastewater Treatment Facility’s compliance with its National Pollutant Discharge Elimination System (NPDES) permit are required to be permitted under the Industrial Pretreatment Program. There are 15 permitted industries with the Greenwood Metropolitan District.

The purpose of the Pretreatment Program is to control the introduction of pollutants that could damage the treatment system or cause interference in the treatment works, prevent pass through of untreated constituents, prevent contamination of biosolids and to protect the safety of GMD personnel and GMD operations.

The Wastewater Treatment Facility’s treatment capacity is determined by a “Headworks Analysis”. Some of the treatment capacity is allocated to residential users and some treatment capacity is allocated to industrial users. GMD manages treatment capacity by permitting industries. The Pretreatment Program includes GMD permitting and inspecting the industries for compliance, annual sampling by GMD, periodic (typically monthly) self-monitoring and reporting, and daily effluent flow monitoring by the industries. GMD is responsible for enforcement of the permit limits, compliance with its NPDES permits, reporting a pretreatment summary semi-annually to SCDHEC, publishing Significant Non-Compliance (SNC), and recognizing exceptional pretreatment programs within the district.