DUBLIN — A water board has asked its 67,000 water customers in Dublin and part of San Ramon to voluntarily cut their use by 20 percent.

The Dublin San Ramon Services District board took the action Tuesday night while also declaring a water emergency for its customers in Dublin and the Dougherty Valley in San Ramon.

The district suggests customers cut indoor water use 5 percent, and outdoor water use 40 percent.

In April, the board is expected to decide whether to take more severe actions, including imposing drought water rates.

District water managers are worried because the district's main wholesale water supplier, the Zone 7 Water Agency, has received a zero allocation of state water this year from the State Water Project. Zone 7 also has asked the public to voluntarily cut water use 20 percent.

Contact Denis Cuff at 925-943-8267 or dcuff@bayareanewsgroup.com. Follow him at Twitter.com/deniscuff