Marshall Co SD 2 Wastewater Treatment Plant, Marshall County, Kentucky

Marshall Co SD 2 is a municipal wastewater treatment plant located in Marshall County, Kentucky, United States. The facility serves a small population of 275 residents and operates under secondary treatment standards, which is the baseline requirement for domestic wastewater under the US Clean Water Act. The plant's design capacity is 567.81 million gallons per year, and it currently discharges approximately 158.99 million gallons annually, indicating significant available capacity. As a US facility, it is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Kentucky Division of Water, which set effluent limits to protect water quality. The treated effluent is discharged to a receiving water body within the Tennessee River basin, which ultimately flows into the Ohio River and then the Mississippi River. The plant's location more than 10 km from the coast reduces direct marine impact, but its discharge contributes to the freshwater ecosystems of the region.

The plant discharges into a tributary of the Tennessee River, which flows into the Ohio River and then the Mississippi River before reaching the Gulf of Mexico. The watershed supports diverse aquatic life, including fish and macroinvertebrates, and is an important migratory corridor for birds. The plant's secondary treatment helps reduce organic pollutants and suspended solids, protecting downstream water quality.