San Gabriel Valley Municipal Water District is moving forward with a regional Golden Mussel Treatment Program at the Devil Canyon First Afterbay to protect the Devil Canyon–Azusa Pipeline and downstream facilities. The Board is being asked on May 11, 2026 to authorize the General Manager to negotiate and execute agreements with the California Department of Water Resources and San Bernardino Valley MWD, approve a cost‑sharing framework, and commit to infrastructure and chemical treatment costs. Total first‑year direct infrastructure and operational costs are estimated around 701,870 excluding chemicals, with SGVMWD expected to cover roughly 25 percent of infrastructure costs plus its proportional share of chemical dosing that may range from approximately 140,275 to 420,825 annually depending on copper dosage.A draft technical treatment plan prepared by Dudek details required infrastructure such as chemical storage tanks, feed systems, spill containment, monitoring, and controls. This is an active planning and early implementation design phase where specialized engineering, equipment supply, automation/controls, and O&M support vendors can help shape system design, pilot operations, monitoring, and long‑term optimization.

LA County moratorium conditions on imported water are driving urgency; treatment must be approved by the Regional Water Quality Control Board and coordinated with State Water Project operations.