Skip to main content
Search

Dwr Cymru Cyfyngedig – AMP8 Cefn Dryscoed WTW

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

Reference: DWR-2023-00006

Version Number: 2

Water undertaker as appointed under section 6 of The Water Industry Act 1991 (as amended): Dwr Cymru Cyfyngedig, with registered number 02366777 (hereinafter called ‘the Company’). 

Assets Affected:

Asset Name

Reference

Ystradfellte Impounding Reservoir

C79240

Cefn Dryscoed WTW Final

T79177

Caerau/Ystradfellte System

Z7039G37

Table 1: List of assets affected and associated reference numbers

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 31 July 2023, which states that there is or has been a significant risk of supplying water from Cefn Dryscoed water treatment works (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

Potential for customer acceptability in distribution

Manganese

D110274

Potential for elevated levels of Manganese due to its presence in the raw water, treatment effectiveness or network

Manganese

D140049

Table 2: 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. Continue to optimise the existing treatment process to minimise the level of manganese entering supply without compromising removal of other parameters.
    Date: Ongoing for the duration of this Notice
  2. Enhanced monitoring of raw and final water for manganese.
    Date: Ongoing for the duration of this Notice
  3. Monitoring and reporting of discolouration contacts in the zones supplied by Cefn Dryscoed WTW.
    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. Review and confirm the appropriateness of the proposed solution for a permanent, dedicated manganese removal stage (dissolved air flotation), including associated waste handling plant and ancillary equipment, to achieve the company target of less than 2µg/l manganese in the treatment works final water (on a 95%ile basis.)
    Date: 30 April 2025
  2. Confirm completion of design and expected start date for construction of the agreed solution.
    Date: 31 March 2027
  3. Complete construction and commissioning of the agreed solution.
    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 Cefn Dryscoed WTW, 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. Confirmation of the appropriateness of the proposed solution.
    Date: 31 May 2025
  3. Confirm completion and provide details of the design and expected start date for construction of the proposed solution.
    Date: 30 April 2027
  4. Confirm completion of construction and commissioning of the proposed solution.
    Date: 30 April 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 April 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 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
05 April 2024
Reference: DWR-2023-00006 v2

Back to top
Print page