Wells and water quality


It is necessary to submit an application for a permit to build a new water intake structure or to replace an existing one. Visit our Permits and Certificates page for more details. 

Proper maintenance of your well will minimize water infiltration and contamination. For more information on installations that comply with provincial standards, please refer to section 18 of the Regulation respecting water withdrawal and protection (Q-2, r.35.2) of the Environment Quality Act.


Have the quality of your well water tested

It is recommended to test the quality of your well water once or twice a year. Spring (snowmelt) and fall (heavy rainfall) are the ideal times to do so.

Often, the contamination of water by bacteria will not change its taste, odour or colour. Other physicochemical parameters (e.g. nitrates, uranium, iron, etc.) also have potential effects on health or water use. The only way to be sure of the quality of your water is to have it tested by a certified laboratory. The Quebec government has a list of laboratories that comply with the regulations and specifically offer these services (French only).


H2O Chelsea Program


End of program in 2024

Unfortunately, the H2O Chelsea program has ceased collecting well water samples since February 1.



What to do in case of contamination? 

For other contaminants (e.g. uranium, fluoride, and other metals), contact a water treatment company wich will be able to recommend possible treatments for your specific water quality problem.

You can also consult the resources below.

Do not drink water before getting satisfactory test results. Do another test one to three weeks after disinfection.

You can easily disinfect your well contaminated with bacteria using a unique chlorination (concentrated) of commercial bleach containing 5.25% sodium hypochlorite. Do not use scented bleach water for this type of application. Obtain fresh bleach because the chlorine it contains is unstable and evaporates over time. Bleach loses half its power within six months. 

Consult the well certificate of authorization to determine the depth of your well. You will find the depth of your well in the report that you received. This report should be included in the documentation you received from your notary when you purchased your home. If this information is not available, please contact H2Lab for advice (1-877-326-8690, toll-free) or consult the resources below.


Please note
For distribution networks (more than 20 people), please refer to the Règlement sur la qualité de l’eau potable du MELCC.



MELCC. La qualité de l’eau de mon puits (French only).

Health Canada. Be Well Aware - Treat your well water  A guide to Well Water Treatment and Maintenance.

This page was last updated on February 15, 2024.


Environment Department

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