This information provides a comparison between the financial flows to investors on the basis of our actual capital structure of water and what they would have been under Ofwat’s notional structure. We provide data for each year 2015/16, 2016/17 and 2017/18, and the average position over the three years.

Download our financial flows

Preliminary financial results

Below are announcements of our preliminary financial results for the specified period below.

Preliminary results 2023-2024

Open Data

We continue to publish our Annual Performance Report (APR) data under an open data licence to ensure it is accessible, reusable, and transparent.

Our APR data tables are available in CSV format, making them machine-readable and easy to use. We also provide accompanying metadata in an accessible format. All data tables and metadata can be accessed via the Stream data portal.

For any questions about accessing or using our open data, please contact AnnualAudits@southwestwater.co.uk. To help us respond effectively, please include details of the specific dataset you are enquiring about.

This data is published under the Creative Commons Attribution (CC BY) licence, allowing free reuse by customers, stakeholders, and other interested organisations. More information on CC BY.

We have also recently published the Open Data Strategy for the Pennon Group, which includes:

SES Water

South West Water

Bournemouth Water

Our open data strategy

Annual reports and financial statements

These reports are the principal way we document our yearly performance and hold ourselves publicly to account.

Annual reports 2026

SBB Water_APR_2026 170726 FINAL

10-PR24-ODI-Payment-Calculator-Model-BRL

10-PR24-ODI-Payment-Calculator-Model-SWB

2025-26 APR Master BRL Final 17.07.26

2025-26 APR Master SBB Final 17.07.26

2025-26 APR Master SWB Final 17.07.26

Accounting Separation Methodology APR 2026 - Bristol

PR24R12-In-period-adjustments-v3.0 SBB

Statutory accounts - South West Water Limited 31 March 2026

Annual reports and financial statements

Annual reports 2025

Annual reports 2024

Supporting documents

Annual reports 2023

Previous annual reports

Interim reports

Below are announcements of interim results for the specified period below.

Financial flows