Q-2, r. 22 - Regulation respecting waste water disposal systems for isolated dwellings

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15. Capacity: The minimum total capacity of a septic tank referred to in section 10 or section 11 must comply with the standards in the following table, according to the number of bedrooms in the isolated dwelling:

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Number of bedrooms Minimum total capacity
(cubic metres)

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1 2.3

2 2.8

3 3.4

4 3.9

5 4.3

6 4.8
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The minimum total capacity of a septic tank referred to in section 10 or section 11 that serves another building must comply with the standards in the following table, according to the total daily flow of waste water, grey water or toilet effluents:

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Total daily flow Minimum total capacity
(litres) (cubic metres)

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0 to 540 2.3
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541 to 1080 2.8
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1081 to 1620 3.4
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1621 to 2160 3.9
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2161 to 2700 4.3
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2701 to 3240 4.8
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R.R.Q., 1981, c. Q-2, r. 8, s. 15; O.C. 786-2000, s. 20.