Water Main Cleaning Program 2017


Municipal Office

395 Mulock Drive P.O. Box 328 Station Main, Newmarket, Ontario
L3Y 4X7

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Watermain Flushing

Watermain flushing is an integral component of the Town's water preventative maintenance program. Uni-directional flushing (UDF) refers to a method of watermain flushing which cleans the water mainlines through a network of flushing sequences - with the water being discharged from a fire hydrant at high velocities. Doing so will remove any mineral deposits, biofilm, and/or sediment that accumulates in watermains and helps maintain the water quality in our system. UDF is the most effective means of watermain flushing, and has been proven to use 40 per cent less water than conventional flushing methods. 

While it is safe to use/drink your water during UDF, it is best to avoid using water for any purpose. If you use water during UDF, unwanted sediment could be drawn into your household water lines, filters, or tanks. Please check your drinking, cooking, and laundry water before using. Should you experience air and/or discoloured water in your lines after UDF, please remove all faucet screens and slowly open the cold water taps, starting at the lowest level of your property and proceeding to the upper levels as applicable. Let the water run for several minutes to clear the lines. Once the lines are clear, close each tap and re-insert faucet screens, starting at the lowest level then proceeding to the upper levels.

We apologize for any inconvenience this work may present and thank you for your cooperation and support.

Watermain swabbing 

The Town of Newmarket uses a variety of industry-approved techniques - including watermain swabbing – to do a thorough cleaning of watermains that, over time, see a build-up of sediment. 

Watermain swabbing involves inserting a foam sponge – or 'swab' – into the watermain through a fire hydrant. The diameter of the swab is slightly larger than the watermain, and it is pushed along through the watermain using water pressure. As it passes through, the swab clears any sediment that has built up inside the watermain. The swab is then pushed up and released through another fire hydrant.

The Town always does its best to reduce impacts to Newmarket residents and businesses. However, during the cleaning process, some residents' usage may be impacted for a short period of time. Residents in the affected households are notified at least 24 hours in advance that watermain cleaning will be taking place on their street, and are provided with information on what to do with their water while they wait.

Learn more about the Town of Newmarket's Water Main Cleaning Program by watching the video below:


Need more information? Read the Watermain Cleaning Program Frequently Asked Questions​.

To speak with someone directly about this program, please call 905-895-5193.​​

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