TUD Sierra Pines Regional Water Treatment Facility Project

The Tuolumne Utilities District is executing the Sierra Pines Regional Water Treatment Facility Project in Tuolumne County, California, located approximately 1.5 miles north of Twain Harte. The project is governed by Streambed Alteration Agreement No. EPIMS-TUO-34729-R4, issued pursuant to Fish and Game Code section 1602. The scope of work involves the construction of a new culvert, reservoir expansion, and the installation of a pond outlet and inlet. A specific amendment to the agreement authorizes additional methods to dewater Pond 2 onsite prior to expansion, utilizing a groundwater trench with wells that discharge water into a temporary riprap field. The California Department of Fish and Wildlife has issued an Amendment Notice of Determination as of July 2, 2026, confirming that the project will not have a significant environmental effect within its jurisdiction. This approval is contingent upon the adoption of a monitoring plan and specific mitigation measures. The project is categorized under NAICS code 237990 and is currently listed as a forecast with a posted date of July 9, 2026. Primary points of contact include District Engineer Erik Johnson and Environmental Scientist Clint Stevens.