Preventive boil-water advisory lifted
Update: September 30, 2025 – 3 p.m.
✅ Preventive boil water advisory lifted
The preventive boil-water advisory for the entire Brossard territory, issued at 8 p.m. on September 27, has now been lifted.
Modernization work at the Le Royer drinking water production plant
The Agglomération de Longueuil is planning modernization work at the Le Royer drinking water production plant, the oldest filtration plant in Québec, located on Riverside Street in Saint-Lambert. Carried out in two phases, the work involves replacing valves and inspecting a main pipe at the plant outlet. These interventions are essential to guarantee system reliability and secure the water supply to the areas served by the Le Royer plant, i.e. the borough of Greenfield Park and the Le Moyne sector in Longueuil, as well as the towns of Brossard and Saint-Lambert.
A flowmeter will also be replaced to meet government requirements under the Stratégie d’économie d’eau potable.
The first phase of work is scheduled to start at 8 pm on Saturday, September 27, and will finish on Monday, September 29. The second phase will be planned at a later date.
During these operations, the Le Royer plant will have to be closed. The sectors normally supplied by this facility (Greenfield Park, Le Moyne, Brossard and Saint-Lambert) will then be served by the Agglomération’s other plants, Louise-Gravel and Mario-Petrone.
Possible repercussions
- Preventive boil water advisories will be in effect throughout Brossard.
- Episodes of colored water may occur.
- Pressure drops are also to be expected.
Frequently asked questions
The plant serves the towns of Brossard and Saint-Lambert, as well as the borough of Greenfield Park and the Le Moyne sector of Longueuil.
The valves are deteriorated and the City has to inspect a main pipe at the plant outlet. These interventions will improve plant reliability and secure the water supply in the Longueuil agglomeration, particularly in the areas served by the plant. The city will also be replacing a flowmeter to meet the requirements of the Québec government’s Stratégie d’économie d’eau potable, among others.
Built in 1925, it is the oldest plant in Québec, and has undergone several phases of renovation over the years. The planned works are part of this continuity.
Work begins on Saturday, September 27, at 8 p.m., and is scheduled to finish on Monday, September 29, 2025. This is the first phase of work. A second phase will be planned at a later date. The City will communicate to this effect in due course.
A precautionary boil-water advisory will be issued for a minimum of 48 hours. Episodes ofcolored water and pressure drops are also possible.
To find out about the repercussions on the use of drinking water and the instructions to follow during the works
click here
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The cities of Brossard and Saint-Lambert, as well as the borough of Greenfield Park and the Le Moyne sector in Longueuil.
The areas affected can be viewed on the interactive map at the bottom of the page.
longueuil.Québec/ebullition-notice
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Citizens can enter their address in the search bar to check whether their building is affected by the work.
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Contact Brossard
Services Brossard
if you have run out of water or if the pressure is extremely low (thin stream of water).
We encourage citizens to buy water from neighbors, family or friends, or to purchase bottled water.
Work is scheduled for completion on Monday, September 29. Water pressure should return to normal by the end of the day.
Water should be allowed to run until clear before boiling (if there is a boil-water advisory) or drinking (if there is no boil-water advisory).
The city recommends postponing certain activities during the work period at the Le Royer plant, such as:
- avoid doing laundry;
- avoid filling the bathtub completely if bathing is necessary;
- limit the time spent in the shower;
- avoid filling the pool;
- avoid watering the garden and plants;
- avoid washing the car, etc.
More information is available on this page Drinking water savings | Ville de Longueuil
Every little gesture counts and can make a difference to avoid overloading the drinking water network.
No. The City must respect a minimum threshold of water pressure and water supply during the work to mitigate these eventualities. So there’s no risk here.
The town is aware that this situation can cause inconvenience, particularly for shops and restaurants. However, as this is a preventive and temporary measure issued by the Agglomération de Longueuil to ensure the security of the water supply, no compensation program is planned. Ville de Brossard continues to support its citizens and merchants by providing clear information and quickly relaying official instructions.
Since the water supply will be maintained throughout the construction period, no bottled water will be distributed. Tap water is still available: simply boil for at least one minute before use (for drinking, cooking, preparing baby bottles, ice cubes, brushing teeth). This preventive measure is the safest way to continue using water during the advisory.
Work will start on Saturday evening to minimize the impact on daily life. Water consumption is lower on weekends, particularly at night, which reduces the risk of pressure drops and colored water, while facilitating technical interventions on the network.
Yes. We recommend using only cold water for consumption, then boiling for one minute before use.
Yes. As for the first phase, the temporary shutdown of the Le Royer plant by the Agglomération de Longueuil will require, for safety reasons, the issuance of a new precautionary boil-water advisory. The public will be notified in advance through the City’s usual communication channels (website, CodeRED, bciti+, social media), so that they can prepare themselves appropriately.