Canadian Water Quality Guidelines For Pesticides And Industrial Substances

"Malathion is a registered insecticide and acaricide used on a wide variety of sites including agricultural and non-agricultural sites. In 2018 (the most recent year for which data are available), over 25 000 kg of malathion was sold in Canada. Malathion may be released into surface water or soil as runoff from the application site. Malathion is not usually found in drinking water sources in Canada. Low levels of malathion have been found in several Canadian provinces. The maximum reported concentrations are well below the MAC. Malathion is rarely detected in foods"--Executive summary.

This report covers Canadian guidelines specifying recommendations and limits for substances and conditions which affect the quality of drinking water. Guidelines included were approved by the Conference of Deputy Ministers of Health as of June 1989. The guidelines and recommendations listed here are intended to apply to all drinking water supplies, public and private. However, they should not be regarded as legally enforceable standards unless promulgated as such by the appropriate provincial, territorial or federal agency.

Of information obtained from a literature review on the uses, fate, and effects of captan on raw water for drinking water supply, freshwater aquatic life, agricultural uses, recreational water quality and aesthetics, and industrial water supplies. Water quality guidelines for the production of specific water uses are recommended.

Editions of these guidelines are prepared following a thorough review of the scientific, technical and medical literature on new parameters and on parameters whose guidelines require revision. This 6th edition includes the guidelines approved by the Conference of Deputy Ministers of Health as of March 1995. No evidence has been presented that would warrant changing the values proposed in the last edition. These values have, therefore, been adopted and are presented in this edition as confirmed guidelines. The guidelines and recommendations listed are intended to apply to all drinking water supplies, public and private, however, they should not be regarded as legally enforceable standards unless promulgated as such by the appropriate agency. This document provides an explanation of terms, a description of microbiological characteristics, chemical and physical parameters, and radiological characteristics. It also includes a list of parameters under review or scheduled for review.