Wastewater Systems Effluent Regulations

Marginal note:Taking samples

• 11 (1) The owner or operator of a wastewater system that — during the previous calendar year in respect of the calendar year, quarter or month in question — deposited via the system’s final discharge point an average daily volume of effluent set out in column 1 of the table to this subsection must, for that calendar year, quarter or month, take at the final discharge point a grab sample of effluent at the minimum frequency set out in column 2.

  Item	Column 1	Column 2
  	Average Daily Volume Deposited Annually (m3)	Minimum Sampling Frequency
  1	> 2 500 and ≤ 50 000	Quarterly but at least 60 days after any other sample
  2	> 50 000	Monthly but at least 21 days after any other sample

• Marginal note:Acute lethality

  (2) The owner or operator must, for each sample taken under subsection (1), determine, or cause the determination of, whether or not it is acutely lethal in accordance with section 15.

• Marginal note:Additional test

  (3) If a sample is determined to be acutely lethal in accordance with section 15, the owner or operator must take a grab sample twice a month, but at least seven days after any previous sample, and determine, or cause the determination of, whether or not it is acutely lethal in accordance with section 15.

• Marginal note:Consecutive samples — not acutely lethal

  (4) If three consecutive samples are, under subsection (3), determined not to be acutely lethal, subsections (1) and (2) apply to subsequent samples.

• Marginal note:Subsequent samples

  (5) For greater certainty, subsection (3) applies to any subsequent sample referred to in subsection (4) that is determined to be acutely lethal when tested under subsection (2).

• Marginal note:Change in sampling frequency

  (6) The minimum sampling frequency set out in column 2 of the table to subsection (1) is reduced

  • (a) for item 1, to yearly, but at least six months after any other sample, if samples were taken under subsection (1) for each of four consecutive quarters and those samples were tested under subsection (2) and determined not to be acutely lethal; and

  • (b) for item 2, to quarterly, but at least 60 days after any other sample, if samples were taken under subsection (1) for each of 12 consecutive months and those samples were tested under subsection (2) and determined not to be acutely lethal.