The 2022 Water Main Cleaning Program has Concluded for the YearThank you to the citizens of Fremont, Newark and Union City for your support of this important program. The main cleaning program has concluded for the 2022 calendar year and will resume in January 2023. Please check our website toward the end of 2022 for additional information.
How the Main Cleaning Program Works
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.
Main cleaning may result in a brief period of discolored tap water for some Tri-City residents from January-June. Despite its appearance, the water will remain safe for household uses such as drinking and cooking. You should, however, minimize water use and avoid washing light-colored laundry from 7:00 a.m. to 4:00 p.m. on the day or week main cleaning is scheduled for your neighborhood.