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South West Water Limited – Pitt New Service Reservoir A Enabling Works

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

Reference: SWB-2024-00008

Version Number: 1

Water undertaker as appointed under section 6 of the Water Industry Act 1991 (as amended): South West Water Limited, with registered number 02366665 (hereinafter called ‘the Company’).

Assets Affected:

  • Pitt Service Reservoir – R8475OUT
  • Allers Supply System – Y8302

Details of this Notice:

  1. The Drinking Water Inspectorate (‘the Inspectorate’) has received various regulation 28(1) reports of the Water Supply (Water Quality) Regulations 2016 (as amended) (‘the Regulations’) from the Company dated 28 October 2024 and 29 Oct 2024 which state that there is or has been a significant risk of supplying water from Pitt New Service Reservoir A (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 potential risks of ingress and microbial re-growth.


C001 Total coliforms (confirmed)


6986


To address the potential risks of ingress and microbial re-growth.


C002 E. coli (confirmed)


7269


To address the potential risks of ingress and microbial re-growth.


C003 Enterococci (confirmed)


7268


To address the potential risks of ingress and microbial re-growth.


C007 Colony counts after 3 days at 22c


7266


To address the potential risks of ingress and microbial re-growth.


C009 Residual disinfectant – free


34654


To address the potential risks of ingress and microbial re-growth.


C010 Residual disinfectant – total


35164

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 the asset in accordance with current company policy, standards and procedures aligning recognised standards of good practice. To include:
    • The maintenance of a proactive inspection and cleaning programme including a robust integrity testing procedure (roof inundation and independent observation).
    • The Maintenance of proactive external inspections, grounds maintenance, site security and asset maintenance including the periodic inspection of hatches, seals, redundant assets, sample taps, overflows, washouts, and air valves.
    • The maintenance of suitable records of remedial work completed.
    • The escalation of all issues that present a risk to water quality.
    • 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
  2. If ingress is identified:
    • Implement immediate mitigation measures to ensure public health is protected.
    • Complete any remedial work required at the earliest opportunity.
      Date: Ongoing for the duration of this Notice
  3. Carry out enhanced monitoring for any tank where a risk to water quality has been identified.
    Date: Ongoing for the duration of this Notice
  4. Include as part of the Company’s Drinking Water Safety Plan (DWSP), a risk assessment of the turnover of stored drinking water.
    Date: Ongoing for the duration of this Notice
  5. Maintain appropriate contingency plans to ensure drinking water quality and sufficiency can be maintained in the event of a risk associated with drinking water quality, in line with industry good practice.
    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. Develop a plan and schedule of works (with timescales) to complete the physical internal inspection and any remedial work at Pitt New Service Reservoir A.
    Date: 30 April 2025
  2. Undertake a physical internal inspection, clean and integrity test of Pitt New Service Reservoir A and complete any remedial work required.
    Date: 30 June 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: 30 April 2025
  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 Pitt New Service Reservoir A, 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 the plan and schedule of works specified in measure (b)1.
    Date: 31 May 2025
  3. Provide the internal inspection report to confirm completion of the physical inspection, cleaning and flood testing of the tank as specified in measure (b)2.
    Date: 31 July 2028
  4. Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
    Date: 31 May 2025
  5. Submit any revisions of the audit strategy produced under measure (c)2.
    Date: Within 1 month of a revision
  6. 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
  7. Submit a satisfactory completion report accompanied by a revised regulation 28(1) report with Board level Director sign-off.
    Date: 31 July 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 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
03 February 2025
Reference: SWB-2024-00008

 

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