Crested Butte South Metro Wastewater Treatment Plant, Colorado

Crested Butte South Metro is a wastewater treatment plant located at 104 Lower Allen Road in Crested Butte South, Colorado, serving a population of 878. The facility operates under the regulatory framework of the U.S. Clean Water Act, which requires secondary treatment for municipal wastewater discharges. As a small community plant, it is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Colorado Department of Public Health and Environment. The plant provides secondary treatment, a standard biological process that removes biodegradable organic matter and suspended solids. With a designed capacity of 492.10 million gallons per year and an actual discharge volume of 340.69 million gallons per year, the facility operates below its capacity, indicating room for future growth or seasonal variability. Secondary treatment typically involves activated sludge or trickling filter systems. The treated effluent is discharged into a local water body within the Gunnison River basin, which flows into the Colorado River system. This watershed supports diverse aquatic life and provides water for agricultural and recreational uses downstream. The plant's inland location, over 50 km from the coast, reduces direct marine impact, but its discharge contributes to the overall water quality of the Colorado River Basin, a critical water source for the southwestern United States.

The plant discharges into a tributary of the Gunnison River, which flows into the Colorado River, eventually reaching the Gulf of California. The Gunnison River basin supports a variety of fish species, including trout, and is a key water source for irrigation and recreation. The Colorado River system is ecologically sensitive due to water scarcity and competing demands, making effective wastewater treatment essential for maintaining water quality and ecosystem health.