Research and analysis
F3: Supply Demand Balance Index (SDBI) status by water company, 2023/2024
Updated 1 December 2025
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| Water Company | Supply Demand Balance Index (SDBI) |
|---|---|
| Anglian Water | Achieved target or better |
| Northumbrian Water | Achieved target or better |
| Severn Trent Water | Achieved target or better |
| Southern Water | Achieved target or better |
| South West Water | Achieved target or better |
| Thames Water | Achieved target or better |
| United Utilities | Achieved target or better |
| Wessex Water | Achieved target or better |
| Yorkshire Water | Achieved target or better |