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System Flushing

2024 Flushing will be March 11 to May 23 — view schedules here

What is the Flushing Program?

Flushing the SLVWD distribution system occurs on an annual basis to improve water quality and maintain infrastructure. Flushing water mains is a standard industry practice to remove accumulated sediment and biofilm in the water distribution system by flushing water at high velocities primarily through water mains and out fire hydrants. This high-velocity flushing scours the inside of water mains. Flushing of mains is performed by certified Distribution system operators.

What should I expect when flushing is occurring on my street?

During flushing, you may experience cloudy and/or discolored water while crews are flushing in your neighborhood. Although your water is still safe to drink, the District encourages customers not to use wate, especially not laundry, because flushing can draw discolored water into your plumbing fixtures and stain clothes. Flushing can also temporarily lower water pressure.

Why do we flush?

The buildup of sediment and biofilms in water mains can restrict water flow, contribute to pipe corrosion and deteriorate water quality.

What is in the sediment?

The sediment found in water distribution systems is largely made up of precipitated iron and manganese. Iron and manganese are common metals found in groundwater wells throughout the nation. Although these metals do not pose a health concern, the minerals can affect the aesthetic quality of water.

Flushing seems like a waste of water…

Although flushing may appear as a waste of water, it is important to maintain water quality and the integrity of the distribution system. The District generally schedules flushing during periods of high surface water stream flow. 

Flushing has just stopped on my street and my water is still colored:

During periods of high water flows, such as while flushing is occurring, the sediment containing iron and manganese can become dislodged, resulting in discolored water episodes. This discolored water can sometimes cause the staining of clothes and plumbing fixtures. If you notice discolored water coming out of your faucet, we recommend not using the water for about two hours to allow the sediment to settle. After this time has elapsed, run all faucets for five minutes and make sure the water is clear. If the water does not clear after the two-hour time window has elapsed, contact SLVWD staff at (831) 338-2153.