Drinking Water Quality

Family walking with dog down sidewalk

The Ontario government has enacted a new drinking water regulation under the Safe Drinking Water Act, 2002.. These changes were designed to safeguard the quality of Ontario's drinking water, while making the regulatory requirements more workable and affordable for owners and operators of municipal and non-municipal drinking water systems.

Ontario's Drinking Water Systems Regulation 170/03, made under the Safe Drinking Water Act, 2002, governs the operation of municipal drinking water systems.  This regulation provides specific requirements that municipalities must adhere to in the operations of these systems, including:

  • water system operational checks;
  • water quality sampling/testing and reporting; and
  • corrective action requirements.
Drinking Water systems

The City of Thorold owns and operates three drinking water systems that fall under this regulation:

  • Thorold Decew Distribution System (No. 220004313)
  • Thorold Port Robinson System (No. 260049582)
  • Thorold South End System (No. 260049621)

For procedures on how to flush the taps in your own home, please view the "A Made in Niagara Guide to Flushing your Facility" guide for more information.

DWQMS Policy

Quarterly and Annual Reports
Quarterly Reports

View the most recent drinking water quality reports below:

Annual Reports

View our Annual Report and all drinking water sample results below:


Copies of these reports are also available for viewing at City Hall and the Thorold Public Library.


In accordance with Section 11 (1) of Ontario's regulation 170/03, the owner of a drinking water system shall ensure that an annual report is prepared in accordance with the requirements of Section 11. 

The annual report must be:

  • Given without charge to every person who requests a copy. Effective steps must be taken to advise users of the system that copies of the report are available and how they can be obtained.
  • Posted to the municipality's web site if the drinking water system is a large municipal residential system serving more than 10,000 people.
  • Given to the owner of any other drinking water system that is connected to and receiving all of its drinking water from the system that is the subject of the annual report.



Contact Us

© 2018 The Corporation of the City of Thorold, 3540 Schmon Parkway, PO Box 1044, Thorold ON, L2V 4A7

Hours of Operation: 8:30 a.m. to 4:30 p.m. Monday to Friday

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