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South West Water Limited– AMP8 Littleton WTW

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

Reference: BRL-2023-00009

Version Number: 2

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:

  1. Y10 Littleton Supply System
  2. T17 Littleton Water Treatment Works

Details of this Notice:

  1. The Drinking Water Inspectorate (‘the Inspectorate’) has received a set of regulation 28(1) reports of the Water Supply (Water Quality) Regulations 2016 (as amended) (‘the Regulations’) from the Company dated 8 August 2023, which state that there is or has been a significant risk of supplying water from Littleton 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 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

High raw water challenge and potential risks generated by the treatment process. 

Total Coliforms

T17Hazard1997

High raw water challenge and potential risks generated by the treatment process. 

E. coli

T17Hazard1998

High raw water challenge and potential risks generated by the treatment process. 

Enterococci

T17Hazard1996

High raw water challenge and potential risks generated by the treatment process. 

Clostridium perfringens

T17Hazard1999

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. Continue to operate Littleton Water Treatment Works treatment process to ensure compliance with regulation 26 and regulation 4 of the Regulations.
    Date: Ongoing for the duration of this Notice
  2. Maintain monitoring in line with frequencies defined in the audit strategy.
    Date: Ongoing for the duration of this Notice
  3. Maintain statutory sampling as defined in the Regulations.
    Date: Ongoing for the duration of this Notice
  4. Undertake annual physical cleans of the UV reactors at Littleton WTW.
    Date: Ongoing for the duration of this Notice
  5. Undertake internal tank inspections and cleans annually at Littleton WTW and complete any remedial work identified at the time of inspection.
    Date: Ongoing for the duration of this Notice
  6. Undertake ongoing maintenance and cleaning of biomass accumulation from the clarifiers.
    Date: Ongoing for the duration of this Notice
  7. Undertake annual filter inspections.
    Date: Ongoing for the duration of this Notice
  8. Regeneration of GAC every two years as required by company policy.
    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 piloting and optioneering phase.
    Date: 31 March 2028
  2. Complete the detailed design and commence construction of the chosen solution.
    Date: 31 March 2030
  3. Complete the installation and commissioning of the chosen solution at Littleton WTW.
    Date: 31 March 2033

(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 September 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 Littleton Water Treatment Works, 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. Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
    Date: 31 October 2024
  3. Provide a report confirming the completion of the piloting and optioneering phase as described in (b)1.
    Date: 30 April 2028
  4. Provide a report confirming the completion of the detailed design and commencement of construction, as described in (b)2.
    Date: 30 April 2030
  5. Provide a report confirming the completion of construction, installation and commissioning of the chosen long-term solution, as described in (b)3 to enable full operational use of the water treatment works. Commissioning must include the following to account for the changes made:
  • An appropriate maintenance regime for any installed processes.
  • Full integration of the new (or modified) processes into the site control and monitoring systems.
  • Updating of the Site-Specific Disinfection Policy and any associated site-specific procedures including the removal of all out-of-date material from circulation; and
  • Provision of adequate training for all relevant personnel on the operation, repair and maintenance of the installed (or modified) process and the revised procedures, policies and manual.
    Date: 30 April 2033
  1. Submit any revisions of the audit strategy produced under measure (c)2.
    Date: Within 1 month of a revision
  2. 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
  3. Submit a satisfactory completion report accompanied by a revised regulation 28(1) report with Board level Director sign-off.
    Date: 30 April 2034

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
21 May 2024
Reference: BRL-2023-00009

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