More than 4 million residents in Los Angeles County are being urged to suspend outdoor watering for 15 days — starting this week — while the Metropolitan Water District repairs a leak in a major delivery pipeline.

The repairs will continue through Sept. 20, and will impact the cities of Beverly Hills, Burbank, Glendale, Long Beach, Pasadena, San Fernando and Torrance.

Since MWD is a source of water for Golden State Water, customers in many Westside communities – including Culver City, El Segundo and Redondo Beach -- are asked to comply with this call to conserve water.

Residents in the Central Basin Municipal Water District, Foothill Municipal Water District, Three Valleys Municipal Water District and West Basin Municipal Water District will also be affected.

The repairs became necessary after officials earlier this year discovered a leak in the 36-mile Upper Feeder pipeline that delivers water from the Colorado River to Southern California before the water is treated and distributed throughout L.A. County.

The pipeline has been running at a reduced capacity after a temporary repair while officials designed a more permanent solution.

"The temporary fix we have in place has allowed us to operate the pipeline at a reduced capacity over the summer, but it is not intended to last long-term," MWD General Manager Adel Hagekhalil said. "We cannot delay this repair any further — doing so risks a failure and the potential for an unplanned, emergency situation."

Residents and businesses throughout the county are being called on to temporarily suspend all outdoor watering, including drip irrigation and hand-watering.

The MWD recommends that trees and gardens be pre-watered before the shutdown and maintained using water collected from the sink and shower. Additional water-saving tips are available at mwdh2o.com/shutdown.

Residents can view a map of affected areas and chart the progress of the repairs at mwdh2o.com/projects-in-your-community.