Rocker Water and Sewer Dist Wastewater Treatment Plant, Butte, Montana

Rocker Water and Sewer Dist is a municipal wastewater treatment facility located in Butte, Montana, United States. The plant serves a small population of approximately 100 residents, reflecting its role as a local utility for a rural or suburban community. It operates under the regulatory framework of the US Clean Water Act, which governs wastewater discharges through the National Pollutant Discharge Elimination System (NPDES) permit program. The plant provides secondary treatment, a standard level that removes biodegradable organic matter and suspended solids. With a designed capacity of 189.27 megaliters per year and an actual discharge volume of 124.92 megaliters per year, the facility operates below its capacity, indicating room for future growth. Secondary treatment typically involves biological processes such as activated sludge or trickling filters. The treated effluent is discharged into the local watershed, likely entering Silver Bow Creek, a tributary of the Clark Fork River. This river system flows through western Montana and ultimately drains into the Columbia River Basin, which reaches the Pacific Ocean. The plant's discharge supports the ecological health of the creek, which is part of a region known for mining history and ongoing environmental restoration efforts.

The plant discharges into the Silver Bow Creek watershed, which flows into the Clark Fork River, a major tributary of the Columbia River Basin. This river system supports diverse aquatic life, including trout species, and is an important migratory corridor for fish. The area has a history of mining impacts, and the plant's secondary treatment helps protect water quality in this sensitive ecosystem.