GRANADA HILLS ( — Residents and businesses across the Southland are being asked to cut back on their water use over the next several days while a regional water treatment plant is shut down for drought-related upgrades.

KNX 1070’s Megan Goldsby reports the advisory – which includes refraining from outdoor watering – comes as water officials prepare to take the Joseph Jensen Water Treatment Plant in Granada Hills offline.

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Officials with the Metropolitan Water District of Southern California (MWD) joined the Calleguas Municipal Water District and Las Virgenes Municipal Water District in making the water-saving request as the agencies rely on limited stored local supplies to maintain deliveries, “making conservation and reduced demands an essential component of maintaining reliability,” according to the MWD.

“We’re doing this so we can make modifications to our distribution system so that we can deliver Colorado River water to South Ventura County and West Los Angeles County,” said MWD spokesperson Jim Green.

Affected cities in West Los Angeles County in Las Virgenes’ service area include Agoura Hills, Calabasas, Hidden Hills and Westlake Village as well as the communities of Agoura, Chatsworth, Lake Manor, Malibu Lake, Monte Nido and West Hills.

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South Ventura County cities in Calleguas’ service area are Camarillo, Moorpark, Oxnard, Simi Valley, Thousand Oaks and Port Hueneme, along with the communities of Camarillo Heights, Las Posas Valley, Oak Park, Santa Rosa Valley, Lake Sherwood, Point Mugu and Somis.

Officials also warned the aesthetic quality of local tap water could be affected by the shutdown, as the reduction in imported water deliveries may require increased use of groundwater within the region. Water may appear cloudy or taste different than usual, but it is still safe to drink, according to Green.

The shutdown was scheduled to begin at 12:01 a.m. Thursday, with water deliveries resuming by noon on Sunday.

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Residents can go online to and for the latest information on the shutdown, as well as water-saving tips.