Markham
Tap water in Markham is medium risk. Usually fine, but a few tests failed this year.
Is it safe?
Markham Distribution System
Medium risk
Usually fine, but a few tests failed this year
99.52% of 3,956 bacteria tests met Ontario’s standards.
100% of 140 chemical tests met the chemical standards.
E. coli was found 3 times.
Provincial inspection score: 95%.
Reported as an adverse result this year: Coliform bacteria, E. coli bacteria, Low chlorine, Water main break.
Source
Ontario Ministry of the Environment, Conservation and Parks, drinking water data 2023–24.
Period covered: April 2023 to March 2024.
Ontario towns are rated from the province’s test results for every municipal drinking-water system: the share of bacteria tests that met the standards, and any E. coli results. Other provinces do not publish one dataset like this, so only Ontario is listed.
Common questions
Can I drink the tap water in Markham, Ontario?
Tap water in Markham is medium risk. Usually fine, but a few tests failed this year.
Where do these ratings come from?
Ontario Ministry of the Environment, Conservation and Parks, drinking water data 2023–24. Period covered: April 2023 to March 2024.