Severn Trent Water Limited – Cropston WTW

Notice under regulation 28(4) of the Water Supply (Water Quality) Regulations 2016 (as amended)

Reference: SVT-2023-00002

Version Number: 1

Water undertaker as appointed under section 6 of the Water Industry Act 1991 (as amended): Severn Trent Water Limited, with registered number 02366686 (hereinafter called ‘the Company’).

Assets Affected:

T0142 – Cropston WTW

Details of this Notice:

  1. The Drinking Water Inspectorate (‘the Inspectorate’) has received a regulation 28(1) report of the Water Supply (Water Quality) Regulations 2016 (as amended) (‘the Regulations’) from the Company dated 24 May 2022, which states that there is or has been a significant risk of supplying water from Cropston WTW(and associated assets as applicable) that could constitute a potential danger to human health or could be unwholesome.
  2. Consequently, this Notice is served on the Company by the Inspectorate on behalf of the Secretary of State, under regulation 28(4) for the assets listed above, for risks associated with:

Description of Risk

Hazard/ Hazardous Event/ Parameter

Hazard I D

Prescence of per- and poly fluoroalkyl (PFAS) substances in the source water

H067 – Per- and polyfluoroalkyl substances (PFAS)


Table 1: Table of the hazards, hazardous events, and/or parameters covered by this Notice, including the Hazard I D numbers and the description of risks.
  1. The Company are required to satisfy the following requirements.

The date given is that until or by which the requirements must be maintained or satisfied, as appropriate.


(a) To maintain the following measures for the period specified in each case:

  1. Monitor for PFAS substances in the source water, at a frequency once per month.
    Date: Ongoing for the duration of this notice
  2. Operate Cropston WTW in such a way that the Thornton Reservoir to Rothley Brook raw water source is not introduced into supply.
    Date: Ongoing for the duration of this Notice

(b) To review, revise or make operational the following measures, by the dates specified in each case:

  1. Conduct a feasibility study to determine the most appropriate solution to mitigate the risks from PFAS substances in the Thornton Reservoir to Rothley Brook source water.
    Date: 19 January 2024
  2. Additional milestones (to include outline design, specific targets related to the selected design and implementation of designed solution) to be submitted following completion of step (b)(1).
    Date: 16 February 2024

(c) To audit whether the measures have been effective by the following means:

  1. Define an audit strategy to monitor the effectiveness of the measures specified in sections (a) and (b).
    Date: 08 October 2023
  2. Implement, and keep under continuous review, the audit strategy defined in measure (c)1.
    Date: Following completion of measure (c)1. onwards.

(d) Not to supply water for regulation 4(1) purposes from Cropston WTW, or not to so supply unless the specified conditions below are satisfied:

  1. Thornton Reservoir to Rothley Brook raw water source is not used as a source of water for supply to consumers until the completion and verification of the designed solution.

(e) To provide the following information in the time and manner specified below to enable monitoring of progress towards the mitigation of the risks:

  1. Provide a progress report annually.
    Date: by 31 January each year.
  2. Provide a report detailing the outcomes of the feasibility study and the proposed most appropriate solution under measure (b)1.
    Date: 19 February 2024
  3. Submit additional milestones as detailed in measure (b)2.
    Date: 16 March 2024
  4. Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
    Date: 08 November 2023
  5. Submit any revisions of the audit strategy produced under measure (c)2.
    Date: Within 1 month of a revision
  6. Submit a report in the event that any completed measures of this Notice need to be altered in any way, for any reason.
    Date: Ongoing for the duration of this Notice
  7. Submit a satisfactory completion report accompanied by a revised regulation 28(1) report with Board level Director sign-off.
    Date: TBC

Further Details of this Notice:

  1. Any product or substance used as a result of the requirements in this Notice must comply with regulation 31.
  2. Under regulation 28(6) the Inspectorate, on behalf of the Secretary of State, may by notice served on the Company, revoke or vary this Notice.
  3. Failure by the Company to comply with this Notice may result in enforcement proceedings under section 18 of the Water Industry Act 1991 (as amended). Contravention of a regulation 28(4)(d) requirement is an offence under regulation 33(1). If guilty of such an offence, the Company is liable on summary conviction, or on conviction on indictment, to a fine. Under regulation 33(2) it is a defence for the Company to show that it took all reasonable steps and exercised all due diligence to avoid the commission of the offence.


Nicholas Adjei
Deputy Chief Inspector, on behalf of the Secretary of State for Environment, Food and Rural Affairs

08 August 2023
Reference: SVT-2023-00002

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