Western - San Bernardino Watermaster
The Western-San Bernardino watermaster addresses water production and distribution within the San Bernardino Basin area, and the Colton and Riverside basins. View reports.

Santa Ana River Watermaster
The Santa Ana River watermaster addresses the quantity and quality of the flow of the Santa Ana River at the Riverside Narrows and Prado Dam. View reports.

Santa Margarita River Watermaster
The Santa Margarita River watermaster administers and enforces provisions regarding rights to surface water and groundwater throughout the Santa Margarita River watershed. View reports.