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Our Services/Trade waste/Trade waste charges
Trade waste charges are calculated based on the volume and the quality of the waste and take into account certain risk factors.
The trade waste charge may consist of three components:
Trade waste customers are divided into the following categories, based on the volume and quality of their trade waste;
Category B customers will pay a higher unit charge for volume than Category C customers. This principle was adopted to provide Category B customers incentive to reuse relatively clean water within the business.
Application and management fees - 2020/21:
Increased charges apply for larger industries with higher risks. Please contact us for more information.
Western Water generally does not meter the trade waste discharges to sewer, except for major customers, so the potable water consumption (rolling three year average) has been used with an industry adjustment factor to estimate the trade waste discharge.
In most instances Western Water has used a factor of 0.6 (for example, every 1000 litres of water consumed, 600 litres is estimated to go to sewer as trade waste), whereas other authorities use factors of up to 0.9 resulting in higher charges. The factor will be adjusted depending on site-specific use.
If a customer wishes Western Water to review the use of the discharge factor they either need to install a flow meter to measure actual trade waste discharges to sewer or provide satisfactory alternative discharge volume evidence.
Volumetric charges - 2020/21:
Trade waste quality is determined by the use of industry averages for similar businesses or, in some cases, by sampling undertaken directly at the business.
Western Water randomly selected a number of customers to cover a wide range of industry types and, based on the waste quality results and from results obtained from other water authorities, has built a database for typical quality for various industry types. Western Water will continue to refine the data as more information is collected.
A revision of the charges is possible if the customer provides satisfactory evidence of discharge quality that differs from Western Water’s information.
Quality charges - 2020/21: