Golden Mussels discovered at water treatment plants in San Jose
An invasive species of tiny mollusks was discovered in San Jose.
The Santa Clara Valley Water District says it found Golden Mussels at the Penitencia and Santa Teresa water treatment plants last month.
Managers say the invaders reproduce rapidly and cause millions of dollars in damage to pipes, irrigation systems and dams.
Valley water says the water is safe to drink, but it now must install costly equipment to remove the mussels.
Crews will also step up inspection rules for boaters and limit how groundwater recharge ponds are used this year.