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Hafren Dyfrdwy Cyfyngedig – Pendinas DSR Rebuild

Notice under regulation 28(4) of the Water Supply (Water Quality) Regulations 2018

Reference: HDC-2024-00003

Version Number: 1

Water undertaker as appointed under section 6 of The Water Industry Act 1991 (as amended): Hafren Dyfrdwy Cyfyngedig, with registered number 03527628 (hereinafter called ‘the Company’). 

Assets Affected:

  • Pendinas Service Reservoir (R0752)
  • Wrexham Supply System (Wrexham)

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 2018 (‘the Regulations’) from the Company dated 2 July 2021, which states that there is or has been a significant risk of supplying water from Pendinas 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 Welsh Ministers, under regulation 28(4) for the assets listed above, for risks associated with:

Description of Risk

Hazard/ Hazardous Event/ Parameter

Hazard I D

Microbiological contamination due to ingress and low turnover.

Escherichia coli (E. coli)

R0752-12009-S-H035-C002-23Q

Microbiological contamination due to ingress and low turnover.

Total coliforms

R0752-12009-S-H035-C001-23P

Microbiological contamination due to ingress and low turnover.

Enterococci

R0752-12009-S-H035-C003-2Q2

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. Implement twice weekly enhanced bacteriological sampling and enhanced data assessment.
    Date: Ongoing for the duration of this notice.
  2. Weekly site security inspection visits.
    Date: Ongoing for the duration of this notice.
  3. Take all reasonable steps to ensure the prescribed concentrations are not exceeded and take all necessary steps to protect public health.
    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. Confirmation of the appropriateness of the proposal to rebuild Pendinas Service Reservoir.
    Date: Complete.
  2. Complete the outline design for the revised solution at Pendinas DSR.
    Date: 31 May 2024.
  3. Commence the construction of the new tank at Pendinas DSR, subject to successful planning permission.
    Date: 30 November 2024.
  4. Complete the construction and commissioning of a new service reservoir in line with the defined scope and completion of works, to isolate the existing Pendinas Service Reservoir.
    Date: 31 December 2025.

(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: 30 June 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 Pendinas Service Reservoir and associated supply systems, 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. Provide a report to confirm the completion of the outline design and expected start date of the proposed solution.
    Date: 30 June 2024.
  3. Provide a report to confirm the commencement of construction of the new service reservoir at Pendinas DSR, subject to successful planning permission.
    Date: 31 December 2024.
  4. Provide a report to confirm the completion of construction of the new service reservoir at Pendinas DSR in line with the defined scope and completion of works, to isolate the existing Pendinas Service Reservoir.
    Date: 31 January 2026.
  5. Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
    Date: 31 July 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: 28 February 2027.

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 Welsh Ministers, 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 Welsh Ministers
22 April 2024.
Reference: HDC-2024-00003

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