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HISTORY
The Upper San Gabriel Valley Municipal Water District (District) was formed by
voters in the San Gabriel Valley at an election held on December 8, 1959 to help
solve water problems in the rapidly-developing San Gabriel Valley. The District
was then incorporated on January 7, 1960.

On March 12, 1963, residents of the District voted to annex to the Metropolitan
Water District of Southern California (MWD), through whose facilities supplemental
water, first from the Colorado River, and now from the State Water Project, is brought
into the Valley. The District played a vital role in determining water rights within
the Main San Gabriel Basin by acting as plaintiff in the 1973 court case of Upper
San Gabriel Valley Municipal Water District, Plaintiff, v. City of Alhambra, et al, Defendants. This case brought about the creation of the Main San Gabriel Basin Watermaster which was ordered by the court to administer and enforce provisions
of the judgement.

Since 1973, the District has also engaged in a water-quality monitoring program
involving chemical and physical constituents in the local domestic water supplies.
The appearance of volatile organic compounds (VOC's) in many water wells in the
District was first discovered in local water supply wells in 1979.

Since approximately 90 percent of the annual water consumption in the San Gabriel Basin is supplied by groundwater, water purveyors have either removed those contaminated wells from service, blended contaminated water with water from other sources or installed treatment systems in order to meet health standards and to
protect public users.

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SERVICE CONNECTIONS
Utilizing the Metropolitan Water District's distribution system, the District provides wholesale water service to local water suppliers through nine service connections. Approximately 60,000 acre-feet of imported water is served through these connections each year, with the majority of the water being used for groundwater recharge.

• Golden State Water Company (USG-1)
• City of South Pasadena (USG-2)
• Main San Gabriel Basin Watermaster (USG-3)
• Suburban Water Systems (USG-4)
• City of Alhambra (USG-5)
• City of Arcadia (USG-6)
• City of Monrovia (USG-7)
• City of Azusa (USG-8)
• Valley County Water District (USG-9)