ISLAND STP Wastewater Treatment Plant, Island, Kentucky

ISLAND STP is a municipal wastewater treatment plant located in Island, Kentucky, a small community in McLean County. The plant serves a population of approximately 440 residents, reflecting its role as a small-scale facility in a rural setting. The plant provides secondary treatment, which is the standard level required by the US Clean Water Act for most municipal facilities. With a designed capacity of 484.53 thousand gallons per day and an average discharge volume of 253.62 thousand gallons per day, the plant operates well within its capacity. As a US facility, it is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Kentucky Division of Water, ensuring compliance with water quality standards. The treated effluent is discharged into a local water body that ultimately drains into the Green River basin, a tributary of the Ohio River. The plant's operations help protect downstream aquatic ecosystems and support the overall health of the Mississippi River watershed.

The plant discharges into a local stream that flows into the Green River, a major tributary of the Ohio River. The Green River watershed supports diverse aquatic life, including several species of freshwater mussels and fish. The plant's secondary treatment helps reduce nutrient and pollutant loads, protecting downstream water quality in the Ohio and Mississippi River systems.