Notice of Regulation: Sketty/Gower


Dwr Cymru Cyfyngedig: Z1034G15 Sketty / Gower

Reference: DWR 3512

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:
Z1034G15 Sketty / Gower : Supply System Y8021 Tywi

  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 06 March 2015, which states that there is or has been a significant risk of supplying water from the Z1034G15 Sketty / Gower zone (and associated assets as applicable) that could constitute a potential danger to human health.
  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:



Hazard ID

Description of Risks



Potential for Discoloured water (brown/ black/ orange) customer complaints

  1. The Company are required to satisfy the following:


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

  1. Regulatory sampling of water at Felindre water treatment works and at customers’ taps.
    Date: Ongoing for the duration of this Notice
  2. Monitoring, tracking and reporting customer contacts.
    Date: Ongoing for the duration of this Notice
  3. Responding as required to any PCV failure or customer contact in line with company procedures. Carry out an investigation to determine the root cause of the failure and identify any remedial measures required to prevent a recurrence.
    Date: Ongoing for the duration of this Notice
  4. Liaison with local and public health authorities as appropriate.
    Date: Ongoing for the duration of this Notice
  5. Review risk assessments for customer contacts and update regulation 28 report.
    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 Distribution zonal study (DZS) including formulating the methodology for mitigating discolouration risk in this zone.
    Date: Complete
  2. Ensure optimisation of Felindre works with 95 percentile less than 20% PCV.
    Date: Ongoing
  3. Confirmation of programme of work identified through the DZS following cost benefit for customer acceptability.
    Date: 31 March 2023
  4. Confirmation of success criteria for demonstration of benefit in delivering the proposed programme of work including commencement dates and timescale for demonstration of benefit.
    Date: 31 March 2023
  5. Delivery of programme of work as identified through DZS in step (b)3 above.
    Date: 31 March 2025

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

  1. Define a strategy for auditing the effectiveness of the above measures to include the following by 29 February 2016;
    Date: Complete
    • Monitoring of iron and manganese levels in samples taken from Felindre works.
    • Implementation of enhanced sampling programme throughout the zone for Fe and Mn to 104 and 52 per year respectively.
    • Review of customer contacts on quarterly basis to measure and monitor change and if necessary, escalate remediation as appropriate.
    • Drinking Water Safety Plan and regulation 28 reports updated in line with any new information arising.
    • Review programme of work and delivery timescales to address priority areas of customer acceptability following updated information.
    • Validate benefits delivered against benefits criteria set.
    • Technical reports for preferred solutions where choices are available.
    • Commissioning, completion and handover certificates for all work carried out in line with the programme as defined in step (b)3.
  2. Implement the audit strategy outlined in (c)1, keep under review, and resubmit when subject to change.
    Date: Until revocation of this Notice

(d) not to supply water for regulation 4(1) purposes from Z1034G15 Sketty / Gower, or not to so supply unless the specified conditions below are satisfied:

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 by 31 January and against the following milestones:
    Date: Annually by 31 January
    1. Provision of the output from DZS as indicated in step (b)1.
      Date: Complete
    2. Provision of the programme of remediation work arising from DZS and criteria for benefit setting as indicated in step (b)3.
      Date: 30 April 2023
    3. Delivery of remediation identified in step (b)5.
      Date: 30 April 2025
    4. Initial completion report.
      Date: 31 October 2026
  2. Review the risk assessment for Z1034G15 as required by Regulation 27(3) and subsequently submit a revised regulation 28 report.
    Date: 31 July 2025
  3. Submit a report in the event that any completed measure of this Notice needs to be altered in any way for any reason.
    Date: Ongoing for the duration of this Notice
  4. Submit a satisfactory completion report accompanied by a revised regulation 28(1) report with Board level Director sign-off.
    Date: 31 October 2027

  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).

Laura Moss
Deputy Chief Inspector on behalf of the Welsh Ministers
12 May 2021
Reference: DWR 3512
Version 5

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