Danbury will temporarily shut down the West Lake Water Treatment Plant tomorrow night. The 9pm closure is being done to replace a valve, with the work expected to be completed by 9am Wednesday. The Margerie Water Treatment Plant will provide water to all customers during the shut down. City officials cautioned that some customers may experience discolored water overnight tomorrow due to changes in normal flow direction in some parts of the water system. Those customers are asked to run the cold water tap until it clears, postpone washing clothes and limit use of hot water until the cold water clears. Once the valve replacement work is complete, the water department will do hydrant flushing to alleviate any discolored water.