Regulatory Library
Regulatory library
A library of our most recent documents as well as the historic Dee Valley Water documents.
As Hafren Dyfrdwy was formed in the middle of the five year period, you will find documents here for Dee Valley Water, Severn Trent and Hafren Dyfrdwy.
Our latest 2023 reports
Read our 2023 Annual Performance Report and Methodology Statement.
Regulatory Reporting
Annual Performance Reports (APR)
AMP 7
AMP 6
Regulatory Accounts
Annual Performance Report summaries for our customers
Methodology Statement
AMP 7
AMP 6
Bioresources Market Information
Statutory Accounting
Annual Report and Accounts (ARA) for Hafren Dyfrdwy
Event Duration Monitor (EDM) Data
You can find our Event Duration Monitor (EDM) report here.
Each line covers a single storm overflow showing spill frequency, duration of spill and percentage of reporting period the EDM was operational.
Comments have been added to highlight key information regarding the data supplied.
The period of reporting starts from the 1st April 2020 to align with the updated Natural Resources Wales permits.
Regulatory Compliance and Assurance
Compliance Statement
Risks, Strengths and Weaknesses and Assurance Plan
To request a copy of a report in Welsh, please email compliance.assurance@severntrent.co.uk
Assurance Summary
AMP 7
AMP 6
Final Assurance Plan
Licence Conditions
Network Access Code
Indicative Access Prices
Scheme of Charges
Statement of Significant Changes (Non Household)
Content surrounding the most recent changes can be found online.
Final Scheme of Charges (Wholesale Non Household)
Final Scheme of Charges (Non Household)
Collected Wholesale Charges
Summary of Charges
Indicative Charges
Board Assurance Statement
Final Scheme of Charges (Household)
Statement of Significant Changes (Household)
New Connections Charges
Other significant documents
Draft Water Resource Management Plan (WRMP)
Content surrounding our latest draft WRMP can be found online.
Customer behaviour
Action Plan for freeze/thaw incident 2018
Welsh language scheme
PR14 reconciliation documents
PR14 reconciliation documents