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These documents provide guideline values for specific parameters used to monitor water quality hazards and recommend science-based monitoring and risk management strategies.

Priority C (lower hazard) micro-organism strains on the Domestic Substances List (DSL) were identified for expedited assessment based on their meeting the criteria for lower potential to cause harm to human health or the environment as described in Prioritization of Micro-organisms on the...

Priority B (medium hazard) micro-organism strains on the Domestic Substances List (DSL) were given a medium priority for assessment because while they are not specifically identified as pathogens, the Government of Canada identified evidence in the scientific literature that indicates they may...

Priority A (higher hazard) micro-organism strains on the Domestic Substances List (DSL) were given a high priority for assessment because the Government of Canada considered them human, plant or animal pathogens (in the case of microbial consortia) or because their hazard level is uncertain.