Duncan Lagoon Wastewater Treatment Plant, Greer, South Carolina

Duncan Lagoon is a municipal wastewater treatment plant located at 605 Robinson Road in Greer, Spartanburg County, South Carolina. The facility serves a small population of 1,539 residents, reflecting its role in a rural or suburban community within the upstate region of South Carolina. The plant provides secondary treatment, which is the standard level required under the US Clean Water Act for municipal wastewater facilities. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. As a small-scale plant, it is subject to state-level NPDES permits issued by the South Carolina Department of Health and Environmental Control, ensuring compliance with effluent limits. The treated effluent from Duncan Lagoon discharges into local waterways that ultimately drain into the Broad River basin, part of the larger Santee River watershed. This region supports diverse aquatic life and is important for regional water quality. The plant's operation helps protect downstream ecosystems and recreational water uses.

Duncan Lagoon discharges into tributaries of the Broad River, which flows into the Congaree River and then the Santee River before reaching the Atlantic Ocean. The local watershed supports a mix of forested and agricultural lands, and the plant's secondary treatment helps maintain water quality for aquatic habitats and downstream communities.