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

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6. The effluent from any treatment plant must comply with the following standards:
(1)  the 5-day carbonaceous biochemical oxygen demand (CBOD5) must be less than or equal to 25 mg/l;
(2)  the concentration of suspended solids (SS) must be less than or equal to 25 mg/l, except if it is shown that the excess is caused by algae proliferating in sewage lagoons;
(3)  the pH value must be between 6.0 and 9.5.
Compliance of the concentrations provided for in subparagraphs 1 and 2 of the first paragraph is assessed periodically on the basis of an average effluent discharge calculated for the periods listed in Schedule I.
The operator of a treatment plant must collect samples or take measurements of the effluent from its plant at the frequencies provided for in Schedule I and the operator must analyze them according to the procedure established in the Schedule.
O.C. 1305-2013, s. 6.