Operation of Firefall Ranch Iron and Manganese Treatment Water Supply Permit Amendment (Project)

The Operation of Firefall Ranch Iron and Manganese Treatment Water Supply Permit Amendment project, managed by the California State Water Resources Control Board, involves the operation of a new greensand filtration and disinfection system in Tuolumne County. Located at 24025 Hwy 120 in Groveland, the system was installed near the existing water storage tank to replace two previous well-site treatment systems. The primary objective of this installation is the removal of iron, manganese, and bacteriological contaminants from the drinking water supply to ensure water quality and safety. The project is governed by a domestic water supply permit amendment issued on July 20, 2026. Under the California Environmental Quality Act, the project has been granted a categorical exemption under Class 1: Existing Facilities per California Code of Regulations section 15301, as the operation of the replacement treatment system involves no change in use. Administrative oversight is provided by the Division of Drinking Water, with key points of contact including environmental scientists and district engineers from the State Water Board.