Covelo WWTP - Secondary Wastewater Treatment in Covelo, California

Covelo WWTP is a municipal wastewater treatment facility located on Riffe Road in Covelo, Mendocino County, California. The plant serves a small population of 890 residents, reflecting its role in a rural community in the northern part of the state. The plant provides secondary treatment, which is the standard level required by the US Clean Water Act for municipal wastewater. With a designed capacity of 302.83 thousand cubic meters per year and an actual discharge volume of 264.98 thousand cubic meters, the facility operates at a utilization rate that suggests adequate capacity for its service area. As a US plant, it operates under an EPA NPDES permit issued by the state of California, which sets effluent limits to protect water quality. The treated effluent is discharged into a local water body that ultimately drains into the Pacific Ocean via the Eel River system. The plant's location inland, more than 50 km from the coast, reduces direct marine impact, but its discharge contributes to the health of the Eel River watershed, which supports diverse aquatic life and is an important migratory corridor for salmonids.

Covelo WWTP discharges into a tributary of the Eel River, which flows through Mendocino County to the Pacific Ocean. The Eel River watershed is ecologically significant, supporting threatened fish species such as Chinook salmon and steelhead trout. The plant's secondary treatment helps reduce nutrient and pathogen loads, protecting downstream water quality in this sensitive coastal basin.