Civil Engineering

An onsite sewage system is usually located on the land where sewage originates. This type of system treats effluent from buildings that are not serviced by a larger municipal or regional sewage system.

Onsite Sewage System:

The Sewerage System Regulation describes three types of sewage systems approved for the disposal of wastewater (domestic sewage):

Type 1: Treatment by a septic tank and dispersal field only.
Type 2: Treatment that produces an effluent consistently containing less than 45 mg/L of total suspended solids and having a five-day biochemical oxygen demand of less than 45 mg/L.
Type 3: Treatment that produces an effluent consistently containing less than 10 mg/L of total suspended solids and having:
- A five-day biochemical oxygen demand of less than 10 mg/L.
- A median fecal coliform density of less than 400 Colony Forming Units per 100 mL.