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The Chino Basin Watermaster is a consensus-based organization facilitating development and utilization of the Chino Groundwater Basin.

The Watermaster consists of various entities pumping water from the Basin including cities, water districts, water companies, agricultural, commercial and other private concerns. Chino Basin Watermaster's mission is "To manage the Chino Groundwater Basin in the most beneficial manner and to equitably administer and enforce the provisions of the Chino Basin Watermaster Judgment", Case No. RCV 51010 (formerly Case No. SCV 164327).

The Watermaster is progressively and actively implementing the Basin's Optimum Basin Management Program which includes extensive monitoring, further developing recharge capabilities, storage and recovery projects, managing salt loads, developing new yield such as reclaimed and storm water recharge and continuing to work with other agencies and entities to enhance this significant natural resource.