The water comes from both local and imported sources. Local water comes from the District’s ten water wells. These wells pump water from a large underground aquifer that underlies most of northern Orange County. The District obtains approximately 70% of the water our customers need from the wells.
The remainder of the water either comes from the Colorado River via the Colorado River Aqueduct or the Sierra Nevada Mountains in northern California via the California Aqueduct.
The District’s wells tap an underground aquifer that underlies most of northern Orange County. The aquifer is carefully managed by the Orange County Water District, and is replenished by water from the Santa Ana River, local rainfall, and surplus water purchased from imported sources.
The District’s groundwater sources are: Well No. 1, Well No. 5, Well No. 7, Well No. 10, Well No. 12, Well No. 18, and Well No. 19 are located within Placentia city limits; Well No. 11, Well No. 15, and Well No. 20 are located within Anaheim city limits. The water from these wells are blended at the Highland reservoir before being served to customers.
The District obtains the remainder of the water our customers need from local wholesaler Municipal Water District of Orange County (MWDOC). MWDOC obtains water from regional supplier Metropolitan Water District of Southern California (MWD). MWD obtains water from northern California via the California Aqueduct, and from the Colorado River via the Colorado River Aqueduct.
MWD owns and operates the Robert B. Diemer Water Treatment Plant located just north of western Yorba Linda where the water is treated to meet drinking water standards.