Mogden formula, 2026/27 charges
Trade effluent calculator: your Mogden charge, worked out
Most English and Welsh water companies charge trade effluent on the Mogden formula: a charge per cubic metre for reception, treatment and sludge, scaled by how strong your effluent is against standard sewage. Enter your volume and strength to see the bill.
The result
- Your volumetric trade effluent charge for the year
- £1,626.20
- Reception and conveyance (R), per m3
- £0.42
- Primary treatment (V), per m3
- £0.42
- Treatment charge scaled by your COD (Ot/Os x B), per m3
- £0.51
- Sludge charge scaled by your solids (St/Ss x S), per m3
- £0.28
- Your charge per cubic metre
- £1.63
- The same volume at standard strength
- £1,334.50
Email me this result
We will send you these figures and a link back to them. One email, nothing else unless you tick the box.
Mogden charges for 2026/27, as the water companies publish them
Last updated
The figures the calculator applies, each from the undertaker's own 2026/27 wholesale charges scheme.
Every figure is read from the water company's own charges scheme through this site's fetch service. Retailer summaries and consultants' guides are used for nothing.
| Undertaker | Band | R | V | B | S | Os (COD mg/l) | Ss (SS mg/l) | Source |
|---|---|---|---|---|---|---|---|---|
| Severn Trent | standard tariff | £0.4210 | £0.4207 | £0.2533 | £0.2395 | 351 | 343 | Severn Trent non-household wholesale scheme of charges 2026/27 |
| Hafren Dyfrdwy | standard tariff | £0.5643 | £0.7503 | £0.4471 | £0.3032 | 351 | 343 | Hafren Dyfrdwy NHH wholesale charges scheme 2026/27 |
| Yorkshire Water | under 50,000 m3 a year | £0.8443 | £0.8349 | £0.7571 | £0.5002 | 840 | 335 | Yorkshire Water wholesale charges scheme 2026/27 |
| Wessex Water | up to 80 Ml of total waste discharge | £1.1777 | £0.4808 | £0.6909 | £0.3593 | 802 | 313 | Wessex Water wholesale charges scheme 2026/27 |
Cite this page
“Mogden charges for 2026/27, as the water companies publish them”, Trade Effluent Calculator, https://tradeeffluentcalculator.co.uk/ (updated 2026-10-28). Every figure is read from the water company's own charges scheme through this site's fetch service. Retailer summaries and consultants' guides are used for nothing.
Want to talk your trade effluent bill through? Book a free call
Related guides
Each one cites where its numbers come from.
What this is based on
- The formula. Unit charge = R + V + (Ot/Os) B + (St/Ss) S, where R is reception and conveyance, V primary treatment, B biological treatment and S sludge treatment and disposal, Ot and St your effluent's COD and suspended solids and Os and Ss the standard strengths. Yorkshire Water wholesale charges scheme 2026/27
- Severn Trent. 2026/27 standard tariff: R £0.4210, V £0.4207, B £0.2533 and S £0.2395 per m3, at standard strengths of 351 mg/l COD and 343 mg/l suspended solids. Severn Trent non-household wholesale scheme of charges 2026/27
- Hafren Dyfrdwy. 2026/27: R £0.5643, V £0.7503, B £0.4471 and S £0.3032 per m3, at 351 mg/l COD and 343 mg/l suspended solids. Hafren Dyfrdwy NHH wholesale charges scheme 2026/27
- Yorkshire Water. 2026/27, under 50,000 m3 a year: R 84.43p, V 83.49p, B 75.71p and S 50.02p per m3, at 840 mg/l COD and 335 mg/l suspended solids. Yorkshire Water wholesale charges scheme 2026/27
- Wessex Water. 2026/27, up to 80 Ml of total waste discharge: R £1.1777, V £0.4808, B £0.6909 and S £0.3593 per m3, at a deemed standard strength of 802 mg/l COD and 313 mg/l suspended solids. Wessex Water wholesale charges scheme 2026/27
- What is left out. Annual band, fixed, sampling and minimum charges, and any part of the treatment your effluent does not receive, are not included. Your retailer's bill is the figure you pay.
This calculator applies water companies' published 2026/27 Mogden figures to what you enter; it is not legal or engineering advice, and your retailer's bill is the figure you pay. An enquiry sent through the form is read and answered by Joe, who runs this site; no firm receives it.
Questions, answered directly
How are trade effluent charges calculated?
On the Mogden formula: a charge per cubic metre of R + V + (Ot/Os) B + (St/Ss) S, where your effluent's COD and suspended solids scale the treatment and sludge parts against standard sewage.(Yorkshire Water wholesale charges scheme 2026/27)
What is a standard strength?
The COD and suspended solids your water company treats as ordinary sewage. They differ by company: 351 mg/l COD at Severn Trent, 840 mg/l at Yorkshire Water and 802 mg/l at Wessex Water.(Severn Trent non-household wholesale scheme of charges 2026/27)
Do I need consent to discharge trade effluent?
In England and Wales a discharge of trade effluent into a public sewer needs the sewerage undertaker's consent under Chapter III of Part IV of the Water Industry Act 1991.(Water Industry Act 1991 Part IV Chapter III)
Is this my exact bill?
No. It applies the published 2026/27 Mogden figures to your volume and strength and leaves out fixed, band, sampling and minimum charges. Your retailer's bill is what you pay.
Sources
This site's own dataset, every figure quoted from its source and dated:
- The UK Trade Effluent Charges carries 3 published figures read from 3 sources' own pages, from 1.39 to 500 GBP, read 28 October 2026.
Embed it
<script src="https://tradeeffluentcalculator.co.uk/embed.js" async></script>