For the better part of a day this April, San Diego’s main drinking water treatment plant wasn’t doing everything it was supposed to do to kill viruses and a nasty parasite known as Giardia before reaching taps across parts of the city, North County, East County and South Bay.
300,000 residents in San Diego County, including those in the Valley Center MWD service area, have or will receive written notices this week about a malfunction at the San Diego County Water Authority (SDCWA) Twin Oaks Valley Water Treatment Plant which occurred on April 21 and 22, 2019. While water quality was never actually impaired, federal regulations and state water officials have required that the notifications be sent.
The San Diego County Water Authority announced today that the Twin Oaks Valley Water Treatment Plant was cited by the state for a valve malfunction in April.
A malfunction at the Twin Oaks Valley Water Treatment Plant resulted in a citation from the state Division of Drinking Water, though the water in regional pipelines continued to be safe for all uses due to additional treatment processes that are in place.
The malfunction lasted for about 15 hours on April 21-22, when ozone dosage levels in the plant fell below state-mandated levels because a valve failed to fully open.