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Hafren Dyfrdwy Cyfyngedig – Abertridwr North SR

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

Reference: HDC-2026-00001

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:

  • R0002 – Abertridwr North 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 2018 (‘the Regulations’) from the company dated 30 July 2025, which states that there is or has been a significant risk of supplying water from Abertridwr North service reservoir (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

Reservoir not cleaned with 10 years

Total coliforms

R0002-378-S-H035-C001-23P

Reservoir not cleaned with 10 years

E. coli

R0002-378-S-H035-C002-23Q

Reservoir not cleaned with 10 years

Enterococci

R0002-378-S-H035-C003-2Q2

Reservoir not cleaned with 10 years

Clostridium perfringens

R0002-378-S-H035-C004A-2YX

Reservoir not cleaned with 10 years

Colony accounts after 3 days at 22ºC

R0002-378-S-H035-C007-2C0

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 all tanks in accordance with current company policy, standards and procedures, that align to recognised standards of good practice.
    Date: Ongoing for the duration of this Notice
  2. Maintain proactive external site inspections, grounds maintenance, site security and asset maintenance. This must include periodic inspections of hatches, seals, redundant assets, sample taps, overflows, washouts, and air valves.
    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. Complete an internal inspection of the reservoir.
    Date: 28 February 2027
  2. Confirm the scope and programme for works following inspection.
    Date: 31 March 2027
  3. Complete any remedial works required, before returning the reservoir to supply.
    Date: 31 March 2028

(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 July 2026
  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 Abertridwr North 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 isolation and inspection of the reservoir.
    Date: 31 March 2027
  3. Confirm the scope and programme of work following inspection.
    Date: 30 April 2027
  4. Complete remedial works required before returning reservoir to supply
    Date: 30 April 2028
  5. Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
    Date: 30 August 2026
  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 April 2029

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
12 June 2026
Reference: HDC-2026-00001 v1

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