Wastewater Systems Effluent Regulations

Marginal note:Taking of samples — intermittent wastewater system

• 11 (1) The owner or operator of an intermittent wastewater system must take at each of the system’s final discharge points, for each period referred to in paragraph 3(a) during each calendar year, a grab sample of effluent on the day a deposit begins if the average daily volume of effluent deposited via all of the final discharge points during the previous calendar year was more than 2 500 m³.

• Marginal note:Taking of samples — continuous wastewater system

  (2) The owner or operator of a continuous wastewater system must take at each of the system’s final discharge points, during each calendar year, a grab sample of effluent at the minimum sampling frequency set out in column 2 of the table to this subsection that corresponds to the average daily volume of effluent set out in column 1 deposited via all of the system’s final discharge points during the previous calendar year.

  Item	Column 1	Column 2
  	Average Daily Volume Deposited (m3)	Minimum Sampling Frequency
  1	> 2 500 and ≤ 50 000	Quarterly, with each sample taken at least 60 days after any previous sample
  2	> 50 000	Monthly, with each sample taken at least 21 days after any previous sample

• Marginal note:Acute lethality

  (3) For each sample taken under subsection (1) or (2), the owner or operator must determine or cause the determination of whether it is acutely lethal in accordance with section 15.

• Marginal note:Additional tests

  (4) If a sample is determined to be acutely lethal, the owner or operator must take a grab sample without delay, and then subsequently once every two weeks, but at least seven days after the previous sample, and determine or cause the determination of whether it is acutely lethal in accordance with section 15.

• Marginal note:Consecutive samples — not acutely lethal

  (5) If three consecutive samples taken in accordance with subsection (4) are determined not to be acutely lethal, subsections (1) to (3) apply to subsequent samples.

• Marginal note:Subsequent samples

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

• Marginal note:Change in sampling frequency

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

  • (a) for item 1, to yearly, but at least six months after any other sample, if samples were taken under subsection (2) for each of four consecutive quarters and those samples were tested under subsection (3) 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 (2) for each of 12 consecutive months and those samples were tested under subsection (3) and determined not to be acutely lethal.