Trihalomethanes (THMs) 

The Department of Environment in partnership with municipal governments monitors trihalomethanes (THMs) in drinking water quality on a regular basis. The collected data is used to ensure compliance with the "Guidelines for Canadian Drinking Water Quality" and to take appropriate measures for THM control. The data is provided to the public on a regular basis through this web page.

The data below is for all sampling carried out up to December 31, 2006.

To see when your community has been sampled please refer to the Sampling Schedule web page.

These documents are in Adobe PDF format and, if you have an older browser, may require the free Adobe Acrobat Reader to view and print. Click on the hyperlinks below to download each document for viewing and printing.

• THM summary data for all communities (pdf)

• Graph of distribution of THM levels

• THM facts sheet

For additional information on trihalomethanes (THMs) or any other water resources related topics please contact us:

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