Wastewater Systems Effluent Regulations

Marginal note:Average daily volume deposited annually

• 7 (1) The owner or operator of a wastewater system must, for each calendar year, calculate the average daily volume of effluent deposited via the system’s final discharge point by

  • (a) determining, in accordance with subsection (2), for each day during that calendar year when effluent was deposited, the volume of effluent deposited via the final discharge point, expressed in m³;

  • (b) calculating the sum of the daily volumes of effluent referred to in paragraph (a); and

  • (c) dividing that sum by the number of days in that calendar year.

• Marginal note:Daily volumes

  (2) The volume of effluent during each day referred to in paragraph (1)(a) must be determined

  • (a) for an intermittent wastewater system,

    • (i) by using monitoring equipment referred to in section 9 that provides

      • (A) a continuous measure of the volume of influent, or effluent deposited via the final discharge point, during that day, or

      • (B) a measure of the rate of flow of the influent or that effluent upon which that daily volume may be estimated, or

    • (ii) by using a method of estimation in accordance with subsection (4);

  • (b) for a continuous wastewater system, by using monitoring equipment referred to in section 9 that provides

    • (i) a continuous measure of the volume of influent, or effluent deposited via the final discharge point, during that day, if the average daily volume of effluent deposited via the final discharge point during the previous calendar year was more than 2 500 m³, and

    • (ii) a continuous measure of that volume or a measure of the rate of flow of that influent or effluent upon which that daily volume of effluent may be estimated, in any other case.

• Marginal note:Estimate of daily volume based on measured rate of flow

  (3) The estimation of the volume of effluent deposited during a day referred to in paragraph (1)(a) based on a measured rate of flow, referred to in clause (2)(a)(i)(B) or subparagraph (2)(b)(ii), is to be done as follows:

  • (a) measure the rate of flow of influent, or effluent deposited via the final discharge point, in any chosen unit of volume for any chosen unit of time; and

  • (b) calculate that volume based on that rate of flow for the duration of the deposits of effluent made on that day and, if applicable, convert it to m³.

• Marginal note:Method of estimation — intermittent wastewater systems

  (4) The owner or operator of an intermittent wastewater system who has established a method of estimation of the volume of effluent must ensure that it is based on generally accepted engineering practices and use it to estimate the daily volume of effluent deposited via the final discharge point with a margin of error of ±15%.