Clearlake Oaks County Water District - The Clearlake Oaks County Water District operates a wastewater treatment plant in the community of Clearlake Oaks. Effluent from this plant is now recycled through the Wastewater reuse system.
Lake County Flood Control and Water Conservation District - The County's Flood Control and Water Conservation District is responsible for stream and ecosystem restoration projects throughout the county. These projects, together with Lake County Sanitation District's (LACOSAN) wastewater upgrades, are helping to improve the overall water quality of Clear Lake, its tributaries, and other important county water bodies.