Main Cleaning

2021 Main Cleaning Schedule

The Alameda County Water District (ACWD) is scheduled to clean a selection of water mains in the city of Fremont, and all dead-end mains in Fremont, Newark, and Union City to improve water quality and remove sediment buildup in pipes that may cause discolored water. This is part of the vital service provided by ACWD to ensure that all customers receive high quality water.

Cleaning will occur from January 2021 through June 2021; Monday through Friday, 7 AM to 4 PM (excluding holidays).  Note that cleaning schedule is subject to change. 

Please note that there may be sediments stirred up in the water during or immediately after the cleaning event, giving the water a cloudy or discolored appearance. The water remains safe to drink (see discolored water FAQs). Residents may experience discolored water on streets or cul-de-sacs if the surrounding areas are being cleaned. Please minimize water use and avoid washing light-colored laundry from 7 AM to 4 PM on the day main cleaning is scheduled or if discolored water is noticed.

Access a map of where main cleaning will occur this year.  (http://arcg.is/1mm8OH)

  • Type your street address in the search box
  • Click on your street name and a dialog box will display the date of water main cleaning.

A list of streetsACWD Main Cleaning Opens in new window being cleaned in 2021 sorted alphabetically by city is also available.

Tip: To search for your street, on your keyboard press Ctrl+F and type your street name into the search box; then press 'Next'. If your street is scheduled to be cleaned this year, the street name will be highlighted. Please note that some streets may have two cleaning dates due to two different cleaning events (main cleaning and dead-end main cleaning).

For further program information please contact the Operations Department administrative staff at (510) 668-6500; Monday - Friday, 8:00 AM to 5:00 PM.

Prior to resuming the main cleaning program this year, ACWD staff thoroughly examined possible recapture methods for main cleaning discharges and will continue to do so. As much as ACWD would like to be able to reuse water from the main cleaning program, unfortunately, in most cases, it’s just not technically feasible. To clean our mains and continue to ensure high quality water for our customers, we need to flush at remarkably high flow rates that are not possible to recapture. The number of trucks, transit time for the trucks, gas, etc. needed to recapture the water would be excessive. Directing the water to a truck would be very time-consuming and resource intensive, significantly increasing costs of these State-required processes.