The forecast average South West Water household bill is £740 a year from 1 April 2026. That is £39 more than the £701 average for 2025/26.
What your bill includes
The published average combines clean water and wastewater services. A metered bill normally includes fixed charges plus charges linked to measured water and an assessed wastewater volume.
Estimate your South West Water bill
The company average is a benchmark, not a tariff. A one-person metered home that uses water carefully can be well below it. A larger household may be above it. Use the calculator with your household size and a realistic usage level.
Company boundaries do not follow postcode boundaries exactly, and different companies can provide water and wastewater. Your latest bill is the authoritative source.
South West Water questions
What is the average South West Water bill in 2026/27?
South West Water's published combined water and wastewater household average is £740 a year, equivalent to £61.67 a month. Individual bills vary.
Can I switch away from South West Water?
Household customers cannot normally switch their appointed regional water company. Eligible businesses in England can choose a water retailer.
Why might my bill be higher than the average?
A larger household, high metered consumption, a leak, a high rateable value or extra services can all result in a higher bill. Compare like with like and check whether your figure covers both water and wastewater.