Watermains are flushed in the spring and fall to clean them by opening select fire hydrants to generate the flows required to scour sediment and rust. Flushing may cause pressure changes, and although water remains safe to use some temporary discoloration and sediment in the water. These short duration events can be cleared up by running a cold tap for about 20 minutes--the tap in a bathtub is suggested to avoid clogging screens in faucets. Avoid running hot water until the cold water has cleared up to avoid drawing sediment into the hot water tank. If these issues arise, call the Public Works On Call phone at (604) 290-1498 so we can investigate. Public Works may also flush in response to water monitoring results or regulatory needs, including increasing chlorine disinfectant residual, reduction or elimination of color or turbidity, or rejection of poor quality water.