Key facts and data from water company plans - October 2023

Water companies submitted their business plans for 2025-2030 to us on 2 October 2023.

During October 2023 we published key facts and data from their plans, including information on proposed increases in investment and customer bills. Following submission, we reviewed the companies’ plans and had extensive discussions with companies which led to plans being updated.

We published the updated data from the revised plans in May 2024 . For comparison, the original data from October 2023 is below.

Customer bills

Water and wastewater companies

Proposed average bill £ Proposed increase in company bill
Water and wastewater companies 2024-25 2029-30 2029-30 vs 2024-25
Anglian Water £496.22 £571.34 15.14%
Dŵr Cymru £462.82 £580.93 25.52%
Hafren Dyfrdwy £411.50 £559.71 36.02%
Northumbrian Water £403.59 £478.23 18.49%
Severn Trent Water £398.33 £546.35 37.16%
Southern Water £410.32 £681.04 65.98%
South West Water £504.29 £620.52 23.05%
Thames Water £436.11 £608.96 39.64%
United Utilities £446.71 £556.17 24.50%
Wessex Water £516.88 £667.75 29.19%
Yorkshire Water £438.12 £584.53 33.42%
Weighted average bill £441.34 £579.81 31.38%

Water only companies

Proposed average bill £ Proposed increase in company bill
Water only  companies 2024-25 2029-30 2029-30 vs 2024-25
Affinity Water £191.72 £216.96 13.16%
Portsmouth Water £114.49 £134.84 17.77%
South East Water £231.93 £277.48 19.64%
South Staffs Water £159.92 £181.52 13.51%
SES Water £236.98 £262.00 10.56%
Weighted average bill £192.97 £222.10 15.10%

The proposed changes in bills do not take account of inflation.

South West Water bill figures do not reflect bills for Bournemouth Water and Bristol Water.

 

Expenditure allowances

More detailed breakdown available.

Water company PR19 Final Determinations – net total expenditure (£m, 2022-23 prices) PR24 Business Plan proposals – net total expenditure (£m, 2022-23 prices) % change between PR19 and PR24
Anglian Water 6,495 9,305 43%
Dŵr Cymru 3,574 5,101 43%
Hafren Dyfrdwy 211 259 23%
Northumbrian Water 3,491 6,027 73%
Severn Trent Water 7,520 13,286 77%
South West Water (inc. Bournemouth and Bristol) 2,833 4,447 57%
Southern Water 4,071 6,606 62%
Thames Water 11,721 18,529 58%
United Utilities 6,846 13,677 100%
Wessex Water 2,522 5,031 99%
Yorkshire Water 5,321 7,921 49%
Affinity Water 1,788 2,124 19%
Portsmouth Water 236 346 47%
South East Water 1,065 1,937 82%
South Staffs Water 678 819 21%
SES Water 310 413 33%
Industry total 58,682 95,828 63%