water quality testsMarkham's tap water meets or exceeds all water quality standards set out by the Ontario Ministry of Environment and Climate Change. We collect and test water samples each day to meet Ontario's Drinking Water Systems Regulation (O.Reg.170/03). The water in our Distribution System is tested for over 120 factors. These include physical, chemical, organic, inorganic and microbiological parameters.

Water samples are taken from green sampling stations that are scattered across the City. We have more than 100 of these stations. Each year, Markham's water also undergoes thousands of health-related tests to ensure quality.

All water samples are tested at an accredited and provincially licensed laboratory. Each sample sent to the lab is documented, tracked, and tested to meet Ontario Regulation 169/03 Standards for water quality.

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