Emerging Threat: Golden Mussels in the Delta

Golden Mussels, a newly detected invasive species detected throughout the Sacramento-San Joaquin Delta, pose a serious challenge to water systems. These prolific mussels can clog pipes, pumps, and other critical infrastructure.

CCWD was among the first to detect the presence of Golden Mussels in the Delta and immediately increased monitoring efforts to track their spread. These mussels have now been observed in the Contra Costa Canal, underscoring the need for ongoing vigilance and swift action.

We are cleaning intake screens daily, evaluating treatment options, and stepping up inspections to catch and address potential issues early. With four intakes in the Delta and storage in Los Vaqueros Reservoir, we are actively utilizing this flexibility to protect the quality and reliability of your water supply while minimizing the impact of emerging challenges. The presence of mussels does not pose a public health and safety risk; however, the mussels do have the potential to impact system operations if not addressed.

Preventing invasive mussel species is a priority and has long been part of our operations and protecting our reservoirs including Contra Loma and Los Vaqueros Reservoirs. Any watercraft entering Contra Loma undergoes a thorough inspection to prevent the introduction of invasive species. Personal watercraft use is prohibited at Los Vaqueros Reservoir.

In addition to implementing our response plans, we are providing guidance to our partner agencies to ensure we continue reliably serving the water needs of central and eastern Contra Costa County. While these mussels are spreading, our proactive approach and early detection are helping us respond quickly and effectively.