In the Montérégie region, agriculture has always been part of the landscape. Fields of vegetables, corn, or soybeans surround many municipalities. But one question is being asked more and more frequently by residents who live near farmland:
Are we exposed to pesticides used in these fields in the Montérégie region?
A large-scale scientific study conducted in Quebec, and highlighted by LaPresse.ca, is currently attempting to answer this question. It focuses in particular on the possible presence of pesticides in citizens’ environments. At Culligan Quebec, specialists regularly observe variations in water quality depending on the region and soil composition.
Here is what we know so far, and what this means in concrete terms for home and well owners in Montérégie.
A unique study in Canada on pesticide exposure
Researchers from the National Institute of Scientific Research (INRS) are currently conducting a large-scale field study called EPURA, which analyzes the exposure of populations living near agricultural areas.
This research is taking place in four municipalities in the Montérégie region:
- Saint Clotilde
- Saint-Rémi
- Saint Isidore
- Saint Michael
In total, nearly 400 residents are participating in the study, making it the largest research of its kind ever conducted in Canada.
The goal is not to diagnose diseases, but rather to understand how pesticides present in the environment can reach humans.
How researchers measure exposure to pesticides
To obtain reliable data, the researchers implemented a very rigorous protocol.
Participants must provide several types of samples:
- Urine
- dust inside the house
- tap water
- land
They must also note in detail:
- their diet
- their water consumption
- certain daily habits
These samples are taken seven times during the study, at different times of the year.
Laboratory analyses will detect the presence of more than 50 different pesticides, including:
- 18 fungicides
- 19 herbicides
- 14 insecticides
This data will then make it possible to understand the pathways by which pesticides reach humans.
Why citizens are worried about pesticide exposure
Residents living near agricultural areas have expressed several concerns. Among the most frequent questions are:
- Can pesticides contaminate my well water?
- Can they end up in the air or in the dust of my house?
- Are there any long-term health effects?
These concerns are understandable. Some scientific research has already demonstrated associations between exposure to certain pesticides and various health effects.
For example, a study published in the journal Environmental Health Perspectives showed that children with greater exposure to certain organophosphate pesticides exhibited more symptoms associated with attention deficit hyperactivity disorder (ADHD). Another study observed an association between prenatal exposure to these substances and a decrease in IQ in children.
It is important to clarify that these studies do not mean that all exposure automatically leads to a health problem. However, they do highlight the importance of better understanding the sources of exposure.
Can pesticides contaminate drinking water?
One of the major concerns is water. In the Montérégie region, many homes in rural areas use a private well rather than municipal water. However, certain agricultural molecules can:
- seep into the soil
- reach the water table
- to find themselves in groundwater
According to Health Canada and the Quebec National Institute of Public Health (INSPQ), the water quality of private wells should be tested regularly, particularly in agricultural areas. Unlike municipal water systems, private wells are not automatically monitored. Therefore, the responsibility for verifying water quality falls to the property owners.
The indoor environment can also play a role
The EPURA study is not only concerned with water. The researchers also analyze:
- dust from the houses
- the soil of the land
- the ambient air
Why? Because pesticides can sometimes enter homes in several ways:
- by the shoes
- by the outside dust
- through the open windows
- by the clothing used in the fields
Certain simple habits could therefore help reduce exposure. For example:
- remove your shoes at the entrance
- clean the floors regularly
- limit the entry of external dust
The study will eventually confirm the effectiveness of these practices.
What the study results could change
The full results of the EPURA study will not be available until 2028. However, they could allow us to:
- to better understand the sources of exposure to pesticides
- to identify situations where exposure is higher
- to propose concrete measures to reduce it
This information could be useful to citizens, public authorities, and the agricultural sector alike.
What can well owners in Montérégie do?
Even while awaiting the results of the study, some measures can already be taken to protect water quality.
1. Have your well water tested
An analysis can be performed to check for the possible presence of:
- bacteria
- nitrates
- pesticides
- heavy metals
Its main benefit is determining whether treatment is necessary. At Culligan Québec, water specialists regularly assist homeowners who want to test the quality of their drinking water.
An analysis can detect certain agricultural contaminants, bacteria, nitrates, or metals naturally present in the soil.
Depending on the results, different treatment solutions can be recommended to improve water quality at home.
You can request a water analysis by filling out the form on the left side of the article.
2. Install a suitable filtration system
Depending on the water composition, specialized filtration systems for nitrites and nitrates could be considered.
3. Monitor water quality regularly
Water quality can change over time. Regular testing allows for the early detection of any changes.
Why water monitoring is particularly important in agricultural areas
The Montérégie region is one of Quebec’s most important agricultural regions. This means that residents benefit from:
- of local food production
- of a dynamic agricultural economy
But this also implies a close relationship with certain agricultural practices, including the use of pesticides. In this context, monitoring water quality becomes a simple and useful preventative measure.
Frequently asked questions about pesticides and drinking water
Can pesticides contaminate well water?
Under certain conditions, some pesticides used in agriculture can seep into the soil and reach groundwater. However, their presence depends on several factors such as soil type, well depth, and agricultural practices.
Is well water automatically analyzed in Quebec?
No. Unlike municipal water systems, private wells are not monitored by public authorities. Owners must have their water tested themselves to verify its quality.
How often should well water be tested?
Public health authorities generally recommend testing water at least twice a year for bacteria and periodically for other contaminants.
Have pesticides ever been detected in drinking water?
Some scientific studies have detected traces of pesticides in the environment, particularly in soil, air, and sometimes groundwater. The concentrations observed vary depending on the region and agricultural practices.
Sources
- INRS – National Institute of Scientific Research
https://inrs.ca - EPURA Study – Exposure to pesticides used in agricultural areas
- La Presse – Ariane Krol
https://www.lapresse.ca - Environmental Health Perspectives – Research on pesticide exposure
https://ehp.niehs.nih.gov - Health Canada – Drinking Water Quality
https://www.canada.ca - National Institute of Public Health of Quebec (INSPQ)
https://www.inspq.qc.ca
