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Q-2, r. 34.1 - Regulation respecting municipal wastewater treatment works

Section 7
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7. The effluent from a treatment plant may not show acute toxicity for rainbow trout Oncorhynchus mykiss or daphnia Daphnia magna, or both. Acute toxicity corresponds to a mortality rate of more than 50% of the organisms exposed to the undiluted effluent.
The operator of a medium, large or very large treatment plant must perform the acute toxicity tests provided for in Schedule II in accordance with the frequencies and procedure listed in that Schedule.
O.C. 1305-2013, s. 7.
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