Discolored water can be caused by galvanized plumbing in your business or home. It could be just one fixture, such as an elbow or a nipple. These events are characterized by yellow to orange water and usually last less than 1 minute.
Brown or yellow tinted water from your tap can be caused by disturbances in the water distribution main lines. Fire hydrant use, a water main break, maintenance work, or if a fire hydrant is hit by a car, are all events that cause discolored water. If you experience brown or yellow water from your tap, allow the water to settle for a short time (1 hour) and then flush all faucets – cold water only – in your home or business for several minutes. The District recommends, if possible, to first flush your backyard garden hose for a few minutes. If the water does not clear up after the initial flushing, repeat the flushing every half hour. The discolored water should clear within 2 hours; if it doesn’t, please contact the District at (650) 726-4405.