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Severn Trent Water Limited – Warley Service Reservoir Rebuild

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

Reference: SVT-2024-00002

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:

R0244 – Warley DSR

    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 4 October 2022, which states that there is or has been a significant risk of supplying water from Warley DSR (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

    To address the risk of ingress contamination and microbial growth.

    Total coliforms (confirmed)

    R0244-906-S-H035-C001-23P

    To address the risk of ingress contamination and microbial growth.

    E.coli (faecal coliforms confirmed)

    R0244-906-S-C111-C002-23Q

    To address the risk of ingress contamination and microbial growth.

    Clostridium perfringens (confirmed)

    R0244-906-S-C111-C004A-2YX

    To address the risk of ingress contamination and microbial growth.

    Enterococci (confirmed)

    R0244-906-S-C111-C003-2Q2

    To address the risk of ingress contamination and microbial growth.

    Residual Disinfectant – Total chlorine

    R0244-906-S-H047-C009-161

    To address the risk of ingress contamination and microbial growth.

    Residual Disinfectant – Free Chlorine

    R0244-906-S-H047-C010-1R3

    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.

    Requirements:

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

    1. Operate Warley DSR in accordance with company policy, standards, and procedures, aligning with recognised standards of good practice.
      Date: Ongoing for the duration of this notice
    2. Carry out investigatory sampling in response to any microbiological exceedances.
      Date: Ongoing for the duration of this notice
    3. Maintain twice weekly (as a minimum) enhanced sampling (in addition to statutory sampling) for Warley DSR. This must include, as a minimum E. coli, and total coliforms.
      Date: Ongoing for the duration of this notice
    4. Maintain proactive external site inspections, grounds maintenance, site security and asset maintenance, including periodic inspections of hatches, seals, redundant assets, sample taps, overflows, washouts, and air valves.
      Date: Ongoing for the duration of this notice
    5. Maintain an appropriate contingency plan for Warley DSR (including liaison with relevant stakeholders as appropriate), in the event of the site needing to be removed from supply to protect human health.
      Date: Ongoing for the duration of this notice
    6. Keep under review residual chlorine concentrations to ensure appropriate set points and trigger values are in place to prevent a deterioration of drinking water quality.
      Date: Ongoing for the duration of this notice
    7. Maintain records and evidence of the identification, decision making, and completion of remedial work at Warley DSR, to ensure a robust audit trail.
      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. Produce a plan of the mitigation actions required to remove Warley DSR from supply in the event of an emergency. Update the regulation 27 risk assessments to reflect this risk.
      Date: 31 March 2024
    2. Confirmation of the appropriateness of the proposal to rebuild Warley DSR, to include the scope of proposed works and timescales for delivery.
      Date: 28 February 2026
    3. Complete construction and commissioning of new service reservoir in line with the defined scope in step (b)2.
      Date: 31 March 2029

    (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: 31 May 2024
    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 Warley DSR, or not to so supply unless the specified conditions below are satisfied:

    1. Not Applicable

    (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. Confirm the plan to remove Warley DSR service reservoir from supply in the event of an emergency as detailed in step (b)1.
      Date: 30 April 2024
    3. Confirm scope of proposed works and timescales for delivery as detailed in step (b)2.
      Date: 31 March 2026
    4. Completion of works to build and commission a new service reservoir at Warley, detailed in step (b)3.
      Date: 30 June 2029
    5. Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
      Date: 30 June 2024
    6. Submit any revisions of the audit strategy produced under measure (c)2.
      Date: Within 1 month of a revision
    7. 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
    8. Submit a satisfactory completion report accompanied by a revised regulation 28(1) report with Board level Director sign-off.
      Date: 30 June 2030

    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).

    Signed

    Nicholas Adjei
    Deputy Chief Inspector, on behalf of the Secretary of State for Environment, Food and Rural Affairs
    13 March 2024
    Reference: SVT-2024-00002 v1

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