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How we calculate your bill

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Here you'll find information about our charges for the year 2024-25 (1st April 2024 to 31st March 2025) and 2025-26 (1st April 2025 to 31st March 2026).

Our household customers’ bills have now increased for the financial year 2025–26.

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From April 2025 the average household bill for combined water and wastewater will rise by 46.7%, from £1.31 per day to £1.93 per day. For the average household, fresh water only bills will go up by 40.0% from £0.55 per day to £0.77 per day and wastewater only bills by 51.5% from £0.76 per day to £1.15 per day.

Inflation and increased investment are the two key drivers of this increase. However, crucially, alongside this increase we're offering a wider range of support for customers, which includes payment holidays, discounts on bills of at least 45%, debt write-offs, access to a Hardship Fund, and even grants for household items.

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How we calculate your bill

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We recognise it’s not always easy to get your head around how utility companies calculate your bills. It can be complicated. Here, you’ll find a simpler breakdown of our charges for water, wastewater (the dirty water we take away from your property) and sometimes other services.

Our regulator, Ofwat, sets a limit on what a company can charge. Our charges are reviewed each year by our Board as part of our governance process. They are also approved by Ofwat.

Southern Water Services Limited, Southern House, Yeoman Road, Worthing, West Sussex, BN13 3NX. Copyright © 2024 Southern Water. All Rights Reserved. Company number 2366670 - Registered in England and Wales.

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© Southern Water Group 2025

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