Main Cleaning

2020 Program Information

The Alameda County Water District (ACWD) is scheduled to clean a selection of water mains in the cities of Fremont, Newark and Union City, and all dead-end mains in the Tri-Cities 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 at various locations throughout the service area from January through June 25 2020; Monday through Friday, from 7 a.m. to 4 p.m. (excluding holidays).

Please note that there may be some sediments stirred up in the water during or immediately after the Main Cleaning event, giving the water a cloudy or discolored appearance. The water remains safe to drink (see discolored water FAQs). Customers may experience discolored water if streets or cul-de-sacs in their immediate area 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 for your neighborhood or if discolored water is noticed.

List of streets being cleaned this year by city:MainCleaning

2020 Main Cleaning Street List - Fremont

(Note: Schedule for June 25 in the city of Fremont has been updated)

2020 Main Cleaning Street List - Newark

2020 Main Cleaning Street List - Union City

Tip: To quickly search 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 (water main cleaning and dead-end water main cleaning).

View the map of the streets being cleaned this year. (

  • 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.

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