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Why are some fire hydrants open with water discharging?
ACWD cleans water mains to remove the buildup in pipes that may cause discolored water. This is accomplished by opening fire hydrants. As the water flows at high velocities through the mains, scale and fine sediment are dislodged. The resulting discolored water leaves the distribution system through the open fire hydrants. Since some of this water eventually flows into San Francisco Bay, ACWD utilizes disinfectant and sediment removal best management practices to minimize impacts to the environment.

To learn more about the main cleaning program, please visit: www.acwd.org/maincleaning.

Drought Resource Center

Show All Answers

1. What are ACWD's sources of supply?
2. Why are some fire hydrants open with water discharging?
3. Why doesn't ACWD recapture the water discharged from fire hydrants in the Main Cleaning Program?