Tenmile Pleasant Valley Sewer District WWTF - Secondary Treatment Plant in Lewis and Clark County, Montana

Tenmile Pleasant Valley Sewer District WWTF is a municipal wastewater treatment facility located in Lewis and Clark County, Montana, United States. The plant serves a small population of 759 residents in the Helena Valley Northeast area, providing essential wastewater management for the community. The facility operates with secondary treatment, which is the standard level required by the U.S. Clean Water Act for municipal plants. The plant is operating at full capacity. As a small-scale facility, it is subject to EPA NPDES permitting through the Montana Department of Environmental Quality, ensuring compliance with discharge limits. The treated effluent from the plant is discharged into local receiving waters, likely tributaries of the Missouri River, which flows through Montana and eventually joins the Mississippi River. This discharge supports the ecological health of the watershed, which provides habitat for diverse aquatic species and is important for regional water resources.

The plant discharges into local streams that drain into the Missouri River basin, a major tributary of the Mississippi River. The watershed supports diverse aquatic life, including native fish species, and is an important resource for agriculture and recreation in Montana. Proper treatment helps protect downstream water quality and ecosystem health.