As California fast approaches what is likely to be a fourth year of punishing drought, residents are being asked to cut their water use to historic lows. But while city dwellers are rising to the occasion — including record reductions in Los Angeles in August — urban consumption still represents only a small fraction of total water use in the state.

Where the rest of it goes depends on whom you ask. The California Department of Water Resources says 50% of the state’s water goes toward environmental purposes, 40% toward agriculture and 10% toward urban areas.