The Agency has long-term contracts with 13 local water districts, called "Member Units", and Improvement District No. 4 for State Water Project (SWP) water. Since 1968, the Member Units have received over 31 million acre-feet of SWP water.

Under the terms of the Monterey Amendment, which was implemented in 1995, Agency Member Units and Dudley Ridge Water District agreed to permanently retire 45,000 acre-feet (af) of SWP Entitlement water in exchange for transferring the Kern Water Bank (KWB) property from the Department of Water Resources to the Agency.  The KWB property was simultaneously transferred from the Agency to the KWB Authority in 1995.  In addition, the Agency agreed to allow up to 130,000 af of "Table A" water to be permanently sold to urban contractors on a willing buyer and seller basis.

• Belridge Water Storage District
• Berrenda Mesa Water District
• Buena Vista Water Storage District
• Cawelo Water District
• Henry Miller Water District
• Kern Delta Water District
• Lost Hills Water District
• Rosedale-Rio Bravo Water Storage District
• Semitropic Water Storage District
• Tehachapi-Cummings County Water District
• Tejon-Castac Water District
• West Kern Water District
• Wheeler Ridge-Maricopa Water Storage District