Zebra mussels, which appeared for the first time in California earlier this month in Hollister's San Justo Reservoir. The Santa Clara Valley Water District is taking measures to ensure the mussels do not appear in area reservoirs.
The Santa Clara Valley Water District is taking aggressive steps to determine if the invasive species, zebra mussel, is in any of its reservoirs, creeks or other water delivery systems.
The action follows the discovery of zebra mussels in San Justo Reservoir, which is in neighboring San Benito County. San Justo Reservoir receives its water from San Luis Reservoir, which is also one of the water district's main sources for imported water.
Zebra mussel is an invasive shellfish that can clog water pumps and pipes and could potentially wreck havoc on the state's water system. The shellfish are commonly transported between reservoirs by recreational boats. Bay Area boaters often frequent a number of reservoirs, which means the chance of the mussels spreading is significant.
The Department of Water Resources confirmed that zebra mussels were discovered in the San Justo Reservoir Jan. 8. This was the first confirmation of a zebra mussel population in a California reservoir. Zebra mussels are closely related to quagga mussels which have been creating significant clogging issues in southern California water systems since early last year.
"The spread of both quagga mussels and zebra mussels have created enormous problems in other parts of the country," said water district board chair Rosemary Kamei. "We know that early intervention is the most effective strategy in controlling the mussels.. That's why we're taking proactive steps now to find out if they are in any of our reservoirs."
In the wake of the latest development, the water district is:
Aiding the California Department of Fish and Game and the Department of Water Resources in assessing whether the zebra mussels at San Justo Reservoir originated in San Luis Reservoir. The water district is inspecting its intake facilities in San Luis Reservoir. It is also working with DFG to perform subsurface inspections of its local reservoirs.
Installing test plates at Calero and Anderson reservoirs and at the intake facilities at San Luis Reservoir. The test plates are a Plexiglas substrate that is commonly used to detect colonies of zebra or quagga mussels. The plates will remain in the reservoirs for at least a month before any conclusions can be made.
As a precaution, temporarily ceased bringing water from San Luis Reservoir into Calero and Anderson reservoirs.
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