TUD Begins It’s Annual Water Main Flushing Program


Tuolumne Utilities District (TUD or District) has begun its annual water main distribution flushing program. TUD field crew members will be working in the Sonora area for the next three weeks at various locations between the hours of 7am to 3pm.

The District would like to inform the community of this maintenance program and for them not to be alarmed if they notice water running down the street or sidewalk while flushing is occurring.  During flushing operations in your neighborhood, you may see crews flushing the water mains through fire hydrants and ends of water main pipes commonly called blow-offs. Crews will usually direct the water being flushed into strategic areas to avoid sediment erosion or localized pooling of water, but you may notice water on the street or roadway.

What is water main flushing?

Water main flushing moves water systematically through sections of a drinking water distribution system, creating a scouring action to clean the line. The increased flow rate scours the water pipe’s inner walls and helps to remove build-up of naturally occurring debris and sediment.

Why is a flushing program important?

Removes sediment- Loose sediment and other deposits may slowly build up on the inside of the water mains over time causing discolored water. Flushing at the appropriate velocities can remove these sediments and deposits and will improve taste, odor, and color that may be problematic e.g., naturally occurring iron or manganese deposits in the distribution system may affect water color.

For more information regarding TUD’s Flushing Program, please click this link: TUD Flushing Program.

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