Treatment by way of septic tank only. Approved method of dispersal is gravity (providing a certain quantity of drainable unsaturated native soils are present) or pressure.
Type 1 is treatment by septic tank, see Table 2-14 for Type 1 effluent quality
Soils are not suitable to treat effluent to a suitable level therefore efforts to improve the quality of effluent before reaching native soils is required.
Some methods of pre-treatment include:
- Package treatment plants
- Specified amounts of treatment sands
- Innovative and new technology systems
Final dispersal usually discharged with a pump to a receiving area.
Type 2 is treatment that produces an effluent consistently containing less than 45 mg/L of total suspended solids and having a five day biochemical oxygen demand (BOD5) of less than 45 mg/L.
A specified level of treatment required, system to be designed by a professional ( Engineer, Geoscientist, or Hydrologist etc.) These systems will be similar to a type 2 system with the addition of efforts to reduce fecal coliform.
Type 3 is treatment that produces an effluent consistently containing less than 10 mg/L of total suspended solids and having a five day biochemical oxygen demand (BOD5) of less than 10 mg/L, and a median fecal coliform density of less than 400 Colony Forming Units (cfu) per 100 mL.