South Tahoe WWTF - El Dorado County, California Wastewater Treatment Plant

The South Tahoe Wastewater Treatment Facility (WWTF) is located in El Dorado County, California, serving a population of about 71,000. Situated in the Sierra Nevada region, the plant is part of the municipal infrastructure for the Lake Tahoe Basin, an area known for its exceptional water quality and recreational value. As a US facility, the plant operates under the Clean Water Act and is regulated by an NPDES permit issued by the California State Water Resources Control Board or the Lahontan Regional Water Quality Control Board. For a population of this size, advanced treatment is typically required to meet stringent effluent limits, especially in sensitive watersheds like Lake Tahoe. The plant likely employs tertiary treatment processes to remove nutrients and protect the lake's famed clarity. The treated effluent is discharged into the Lake Tahoe watershed, which ultimately drains via the Truckee River to Pyramid Lake in Nevada. Lake Tahoe is a deep, oligotrophic lake with exceptional clarity, and the plant's operations are critical to preventing nutrient loading that could lead to algal blooms and clarity loss. The surrounding basin is ecologically sensitive, supporting diverse aquatic life and serving as a major recreational destination.

The South Tahoe WWTF discharges into the Lake Tahoe Basin, a high-altitude, ultra-oligotrophic lake renowned for its clarity. The lake drains via the Truckee River to Pyramid Lake, an endorheic desert lake. The watershed is ecologically sensitive, with strict regulations to prevent nutrient enrichment that could degrade water quality and harm native species like the Lahontan cutthroat trout.