The source of Markham's drinking water is Lake Ontario. Markham purchases treated drinking water from the City of Toronto and Peel Region. In addition to providing drinking water, Markham maintains the wastewater collection system (sewer system). Our wastewater is piped to a water treatment facility in Pickering where it is processed and released back into Lake Ontario.

To learn more about some common service questions please see below.

Customer Service
Complementary Content