Trade effluent charges
The cost of collecting, treating and disposing of trade effluent depends on the volume of effluent discharged and the strength of the wastewater. Companies assess the volume and strength of trade effluent before it enters the sewers.
Calculating charges for trade effluent
Charges are based on the Mogden formula. This takes into account the following costs (as relevant):
- collection
- primary treatment
- biological treatment
- treatment and disposal into the sea
- biological oxidation of settled sewage
- treatment and disposal of primary sludge
The formula takes into account the level of treatment needed for trade effluent from a particular customer. This means that customers pay less for wastewater that is cleaner, and so easier to treat.
As each company calculates the average costs for its region, charges do not reflect the costs incurred at any one treatment works. Companies may reduce the collection charge for customers who discharge directly to the treatment works.
United Utilities offers, on an optional basis, a reservation charge for trade effluent customers. The charge comprises a:
- fixed element to reflect the cost of infrastructure capacity you reserve, based on the volume and loads specified in your consent and agreement; and
- variable element based on the actual flow and loads discharged from your premises.
Further information
Find out more about:
- Mogden formula
- Balancing trade effluent volume and strength charges
- Large user trade effluent charges
- Balancing metered foul sewage and trade effluent charges
