As the deepening drought threatens to dry up some West Marin wells in the coming months, the county government wants to tap into dwindling reservoirs to avoid a potential public health emergency.

The county proposes to truck reservoir water for the next four months to an estimated 10 to 20 residences in areas such as Nicasio, San Geronimo Valley and Lucas Valley. The actual number of residents is not certain, county officials said, as qualification criteria are still being drafted.