Wastewater Systems Effluent Regulations

Marginal note:Taking of samples — intermittent wastewater system

• 10 (1) The owner or operator of an intermittent wastewater system must, during each period referred to in paragraph 3(a), take at the system’s final discharge point a grab or composite sample of effluent at the following minimum frequency:

  • (a) if the period is more than 30 days, every two weeks but at least seven days after any other sample; and

  • (b) in any other case, once.

• Marginal note:Taking of samples — continuous wastewater system

  (2) The owner or operator of a continuous 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 sample of effluent of the type set out in column 2 at the minimum frequency set out in column 3.

  Item	Column 1	Column 2	Column 3
  	Average Daily Volume Deposited Annually (m3)	Type of Sample to be Taken	Minimum Sampling Frequency
  1	≤ 2 500	Grab or composite	Monthly but at least 10 days after any other sample
  2	> 2 500 and ≤ 17 500	Composite	Every two weeks but at least seven days after any other sample
  3	> 17 500 and ≤ 50 000	Composite	Weekly but at least five days after any other sample
  4	> 50 000	Composite	Three days per week but at least one day after any other sample

• Marginal note:Sampling and frequency for certain continuous systems

  (3) Despite subsection (2), the owner or operator of a continuous wastewater system with a hydraulic retention time of five or more days must

  • (a) take a grab or composite sample; and

  • (b) reduce the minimum sampling frequency to quarterly, but at least 60 days after any other sample was taken, if the system deposited via its final discharge point an average daily volume of less than or equal to 2500 m³ of effluent during the previous calendar year referred to in subsection (2).

• Marginal note:Determination of certain deleterious substances

  (4) The owner or operator must, for each sample taken under subsection (1), (2) or (3), determine, or cause the determination of

  • (a) the carbonaceous biochemical oxygen demand due to the quantity of CBOD matter in the effluent, in accordance with section 12; and

  • (b) the concentration of suspended solids in the effluent, in accordance with section 13.

• Marginal note:Before July 1, 2014 — additional determination

  (5) Until July 1, 2014, the owner or operator must, for each sample taken under subsection (1), (2) or (3), determine, or cause the determination of, the concentration of un-ionized ammonia in the effluent, in accordance with the formula and a test method referred to in section 14.