Bethel residents are voting in a referendum today about a 500,000 gallon Chestnut Ridge water tank project.  The tank would be partially buried in a lot in the woods between Long Meadow Lane and Briar Cliff Manor.  The project is eligible for a state grant and low-interest financing from the state.  The rest would be paid for from customers’ water rates.  Bethel officials say the $2.24 million project is needed to further reduce the need for reservoir water and to increase pressure to the eastern side of town.  Officials added that well water is cleaner than the reservoir.  Polls close at 8pm.