The CAGRD must replenish (or recharge) in each AMA the amount of groundwater pumped by or delivered to its members which exceeds the pumping limitations imposed by the AWS Rules. This category of water is referred to as "excess groundwater".

Recharge may be accomplished through the operation of underground storage facilities or groundwater savings facilities. CAWCD may sell its indirect storage and recovery credits to the CAGRD at fair value.