The Mogden Formula
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The Mogden formula seeks to link charges for discharging trade effluent to the public sewer to the costs imposed by customers, i.e. by paying according to the volume and strength of trade effluent discharged. The formula was agreed between the water industry and the Confederation of British Industry.
The formula consists of a number of coefficients relating to the volume, COD and solids of the discharge. Some specific water companies whose areas have a coastal boundary and may discharge treated water to sea can apply a marine outfall charge.