Why do you charge for trade waste disposal?

Trade waste imposes additional load on our sewerage system. Trade waste charges apply to customers discharging sewage into our network that is above domestic strength and recovers the cost associated with trade waste treatment and audit activities.

Trade waste approval holders will be assigned a trade waste category – 1, 2 or 3 – for charging purposes.

Category 1 approval holders will no longer incur trade waste charges and will pay sewage disposal charges instead, as their discharges are deemed at or below ‘domestic strength’ – i.e. the combined wastewater discharge is of a strength less than or equal to domestic sewage.
Category 2 approval holder discharges are deemed greater than ‘domestic strength’. Category 2 charges will be calculated based on water usage multiplied by Discharge Factor multiplied by an ‘above domestic strength’ tariff, which helps cover the treatment costs associated with above domestic strength trade waste.
Category 3 approval holders are those with approval to discharge more than 25kL per day or more than 25kg/day Biochemical Oxygen Demand (BOD). Category 3 charges are based on quality charges for Suspended Solids, BOD, Nitrogen (TKN) and Phosphorus (TP). These charges will be calculated using the customer’s input water volume, sewage discharge factor and readings from the trade waste discharge meter for accurate determination.

Trade Waste Charge per kilolitre
Category 2  $1.050 
  Charge per kilogram

Category 3
Suspended solids


1. Sewerage services charge before a Discharge Factor is applied.

2. A percentage value identifying the proportion of water used at a property that is considered to be discharged back into the sewer network. Discharge Factors are determined by Land Use Code and differ across property types and industries. 

3. Domestic strength is an expression of the concentration of contaminants in typical domestic sewage. (Specifically, the contaminants concentrations are 300 mg/L Biochemical Oxygen Demand, 330 mg/L Suspended Solids, 70 mg/L Total Nitrogen, and 12 mg/L Total Phosphorous.)

4. Vacant land is land that does not contain buildings or structures and cannot be used for human habitation or occupation. It does not apply to land that is used for outdoor storage, assembly areas or rural activities such as cultivation or grazing. 

5. A discharge factor of 0.9 will apply to all vacant land.