Mark Twain State Park and H Wastewater Treatment Plant, Monroe County, Missouri

Mark Twain State Park and H is a wastewater treatment plant located in Monroe County, Missouri, United States. The facility serves a small population of 70 people, reflecting its role as a localized treatment system for a state park and nearby area. The plant employs advanced treatment processes, ensuring a high level of effluent quality. With a designed capacity of 37.85 units and a current discharge volume of 26.50 units, the plant operates below its capacity. As a US facility, it falls under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting, which sets discharge limits to protect water quality. The treated effluent is discharged into local waterways that ultimately drain into the Mississippi River basin. The plant's advanced treatment helps protect downstream aquatic ecosystems and supports the ecological health of the region's rivers and streams.

The plant discharges into local streams that flow into the Salt River, a tributary of the Mississippi River. The Mississippi River basin supports diverse aquatic life and is a critical migratory corridor for fish and birds. Advanced treatment at this plant helps minimize nutrient and pollutant loads, protecting downstream water quality in the Missouri and Mississippi river systems.