Water test results in Côte Saint-Luc
The following section contains a table with the results of water samples collected from 2013 to 2019 in Côte Saint-Luc. These test results measure lead concentration in the water sample taken from the tap of drinking water in individual homes. The civic number of the household has been removed from the table, however the street is included.
A visual representation of this table superimposed on a map is found below, which illustrates how many tests were done on each block and the number of results from 0 to 5 ppb, 6 to 10 ppb, and 11 ppb and above.
In 2013, cities across Quebec began doing water sample tests for the presence of lead and copper following a directive from the Quebec environment ministry. The water test is done at a tap inside the home and must be done between July 1 and October 1.
At the scheduled appointment time, technicians arrive at the home to be tested. They follow the testing protocol and take water samples, usually from kitchen sinks. The samples are then analyzed at an accredited lab and the results are sent directly to the Quebec environment ministry. A copy of the results is sent to the city, which sends letters to homeowners indicating the levels of lead and copper found during the test. These letters are reviewed by the Quebec public health authority, the Direction régionale de santé publique de Montréal, or DRSP.
In the event that a test result is above the norm, the water must be re-tested. The table of results includes all water test results—include these re-tests. Each test result includes a column indicating whether it was an initial test or re-test. In the statistics summary below, we provide the average test score of the initial water tests (one per household) and also the average test score of all water tests (including the repeated tests at the same household which skews the results because of the double counting of results above 10 ppb). That said, we are providing all the test results in order to be transparent.
While everyone is exposed to trace amounts of lead through air, soil, household dust, food and drinking water, and consumer products, Health Canada states that there is no safe threshold for lead. Montreal’s regional public health department (DRSP) considers that health risks from drinking water are low and different jurisdictions have different maximum acceptable concentrations.
In the table of results, we use the unit of measurement ppb. The unit of measurement mg/L is used by the Quebec government and other agencies. For reference purposes, the table below shows equivalencies between ppb to mg/L and notes different maximum acceptable concentrations in different jurisdictions.
|Parts per billion
||Milligrams per litre
||Maximum acceptable concentration (Quebec, 2001–2019; World Health Organization, current)
||Average concentration of lead from initial water samples in Côte Saint-Luc (2013 to 2019) at 238 single-family homes and duplexes in areas where the city suspect there are water service lines made of lead
||Maximum acceptable concentration (Quebec, 2020 onward)
The following is a summary of key statistics from water testing done in Côte Saint-Luc between 2013 and 2019.
- Individual households tested: 238
- Tests done including re-tests at same household: 309
- Average lead concentration at initial test of 238 households: 6.7 ppb
- Percentage of initial test results from < 1 to 5 ppb: 39%
- Percentage of initial test results from < 1 to 10 ppb: 84%
Test results for lead concentrations per block
The map shows the number of tests per block and the test result range from 2013 to 2019. The number inside the circle refers to how many water tests on that block were within that range. For instance, a green cicle with a 3 inside means that there were three water tests on that block measuring between < 1 to 5 ppb.
Table of results
These test results measure lead concentration in the water sample taken from the tap of drinking water in individual homes. The civic number of the household has been removed from the table, however the street is included.
Download the table in XLSX format.