Water Main Cleaning Program 2018


Municipal Office

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

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Watermain cleaning in Ward 7 from July 9 to 14, 2018

From July 9 to 14, the Town of Newmarket and York Region will be conducting water main cleanning from 9 p.m. to 6 a.m. in specific areas of Ward 7. The Town will be using a variety of techniques - including watermain swabbing – to do a thorough cleaning of several of the watermains that, over time, see a build-up of sediment.

Before the scheduled watermain cleaning operation, it is recommended that residents:

  • Turn off their water valve, located next to the water meter to prevent water use
  • Fill a clean container with tap water for drinking and cooking (store in fridge)
  • Complete all dishwashing, clothes washing, and other water-use activities
  • Fill their bathtub with water for use around the house (residents may want to use a pail to transfer (residents may want to use a pail to transfer water from the bathtub to flush their toilet)

During the scheduled watermain cleaning operation, residents should avoid using water for any purpose. The watermain cleaning operation is expected to take approximately eight to 10 hours to complete which includes set-up and removal of equipment.

Affected households will be notified at least 48 hours in advance through the use of door hangers. Businesses will be notified at least 72 hours in advance through a hand-delivered letter. Information will also be provided on what to do before, during, and after the watermain cleaning program is complete for their area and the scheduled time and date.

Residents who are having treatment for dialysis at home or have any other medical condition that requires constant water service, please contact the Town of Newmarket at 905-895-5193 immediately.

For more information, view the Watermain Cleaning Program Frequently Asked Questions​ or view a map of the affected area. 

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.​​

Additional Resources: