Key points
- Challenge the default 95% return-to-sewer assumption where you can
- Claim leak allowances promptly once a leak is fixed
- Sub-meter high-use processes to prove real effluent volumes
- Low-flow fittings pay back fastest on public-facing sites
Return-to-sewer allowance
By default, wholesalers assume 95% of the water you consume returns to the sewer. If you evaporate, bottle or spray a material share of it, you can apply for a lower return-to-sewer percentage.
Leak allowances
If a burst on your side of the meter caused a spike, you can claim a leak allowance once the leak is fixed and evidenced. Most retailers will submit the claim for you.
Sub-metering high-use processes
Fitting a sub-meter on cooling towers, laundries or vehicle wash bays makes it easy to prove your true trade-effluent volume and reduce Mogden-formula charges.
Simple operational fixes
Flow restrictors on taps, sensor urinals and low-flow fittings pay back in months on high-footfall sites.
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