Div. B › Part 8 › 8.6 › 8.6.2 — Treatment Units

8.6.2.1 — Septic Tank Systems

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(1) An effluent filter shall be installed in the outlet flow path of every septic tank that discharges effluent to a leaching bed.

(2) The septic tank effluent filter required by Sentence (1) shall,

(a) conform to the requirements of NSF/ANSI 46, “Evaluation of Components and Devices Used in Wastewater Treatment Systems”,

(b) be sized to filter particles of 1.6 mm,

(d) be installed in accordance with the manufacturer’s recommendations.

(3) A secured access opening to allow for regular maintenance of the effluent filter shall be provided at the ground surface.

OBC Definitions

Defined terms on this page

effluent

means sanitary sewage that has passed through a treatment unit.

leaching

means dispersal of liquid by downward or lateral drainage or both into permeable soil, as defined in Part 8 of Division B, or leaching bed fill.

leaching bed

means an absorption system constructed as absorption trenches or as a filter bed, located wholly in ground or raised or partly raised above ground, as required by local conditions, to which effluent from a treatment unit is applied for treatment and disposal and that is composed of, (a)the soil, as defined in Part 8 of Division B, leaching bed fill or other filter media that is contained between the surface on which the sanitary sewage is applied and the bottom of the bed, (b)the leaching chamber or the distribution pipe and the stone or gravel layer in which the distribution pipe is located, and (c)the backfill above the distribution pipe or the leaching chamber, including the topsoil and sodding or other anti-erosion measure, and the side slopes of any portion elevated above the natural ground elevation.

septic tank

means a watertight vault in which sanitary sewage is collected for the purpose of removing scum, grease and solids from the liquid without the addition of air and in which solids settling and anaerobic digestion of the sanitary sewage takes place.

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