Water Division Overview

The Water Division operates and maintains the City’s water treatment, distribution and metering.

Approximately 87 percent of Oceanside’s water is purchased from the San Diego County Water Authority. Oceanside purchases raw water and treats it at the Robert A. Weese Filtration Plant.

The remaining 13 percent of Oceanside’s water comes from the Mission Basin. This brackish groundwater is extracted and becomes potable water through a desalting process at the Mission Basin Groundwater Purification Facility.

The department also reclaims wastewater at the San Luis Rey Wastewater Treatment Plant and uses it to irrigate the Oceanside Municipal Golf Course.

The Water Division operates and maintains over 500 miles of waterlines that distribute water throughout the City, and 12 reservoirs with a capacity of 50.5 million gallons.