Mariposa WWTF - Secondary Wastewater Treatment Plant in Mariposa, California

Mariposa Wastewater Treatment Facility (WWTF) is a municipal plant located in Mariposa, California, serving a population of approximately 2,246 residents. The plant is situated in the Sierra Nevada foothills and provides secondary treatment to wastewater from the community. The plant operates under the U.S. Clean Water Act, which requires secondary treatment for municipal wastewater. With a designed capacity of 2,309.09 megaliters per year and an actual discharge volume of 794.94 megaliters per year, the facility has capacity to accommodate future growth. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged to local waterways that drain into the Merced River watershed, which flows through Yosemite National Park and eventually reaches the San Joaquin River and the Pacific Ocean. The plant plays a key role in protecting water quality in this ecologically sensitive region, which supports diverse aquatic life and recreational uses.

The plant discharges into local streams that are part of the Merced River watershed, which flows through the Sierra Nevada and Central Valley before reaching the San Joaquin River and ultimately the Pacific Ocean. This region supports important aquatic habitats, including cold-water fisheries for trout and salmon. The secondary treatment process helps reduce nutrient loading and protect downstream water quality in this ecologically sensitive area.