Calexico, California, USA

Water System Improvements Project for Calexico, California

Status: Completed


Calexico obtains its drinking water from the Colorado River. Its water treatment plant (WTP) was constructed in 1949 and expanded in 1965 to treat up to 10 million gallons per day (mgd). In 1997, the California Department of Health Services (DHS) Office of Drinking Water identified numerous deficiencies in the WTP that compromised its ability to provide properly treated and disinfected drinking water in compliance with the applicable quality standards on a continuous basis to meet growing demand. Population growth in the service area had increased average daily flow requirements by 6 mgd and peak flows during the summer months by 8 mgd. Moreover, the city had limited water storage capacity. The State encouraged the city to expand the plant to correct these deficiencies.

Project Scope

    The project consisted of the rehabilitation and expansion of the water treatment plant, from 10 to 16 mgd, as well as construction of a 24-inch diameter, 13,200-foot water distribution main and, a 6-million gallon treated water storage reservoir and pump station.


    The project provided a reliable source of safe drinking water by improving the water treatment system and correcting the deficiencies found by DHS, as well as provide additional capacity to meet future growth of the community through the year 2020.

    Project Financing

    Total Project Cost US 15.03M
    NADBank Funding US 6.48M - NADBank Grant: BEIF
    Other Funding Partners City of Calexico, California
    Economic Development Administration (EDA)