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Anglian Water Services Limited – AMP8 Warren Hill PFAS

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

Reference: ANH-2024-00001

Version Number: 1

Water undertaker as appointed under section 6 of the Water Industry Act 1991 (as amended): Anglian Water Services Limited, with registered number 02366656 (hereinafter called ‘the Company’).

Assets Affected:

  • Southfields Source CSTH0WV
  • Southfields Bore 3 ASTH3CV
  • Southfields Bore 4 ASTH4CV
  • Southfields WTW TSTHF
  • Warren Hill 1 Reservoir TWH1
  • Newmarket PWSZ ZFS03
  • Cheveley PWSZ ZFE36
  • Bottisham PWSZ ZFE35

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 2016 (as amended) (‘the Regulations’) from the Company dated 2 July 2024, which states that there is or has been a significant risk of supplying water from Southfields borehole sources (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

Increasing PFAS to Tier 2 target breach.

H067 Per- and polyfluoroalkyl substances (PFAS)

Various including:

Southfields WTW ANH-TSTHF-H067-TR3605

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. Regular review and update of the ground water risk assessments.
    Date: Ongoing for the duration of this Notice
  2. Operational and regulatory monitoring for PFAS at the raw water source, and final water at Southfields WTW and Warren Hill Reservoir No 1.
    Date: Ongoing for the duration of this Notice
  3. Tier 2 sample results on the final water investigated in line with company procedures.
    Date: Ongoing for the duration of this Notice
  4. Understand the PFAS risks from the catchment investigations and continue to understand catchment management opportunities and control measures.
    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. The Company will take all reasonable steps to ensure that the PFAS levels do not exceed Tier 3 on the final water and any steps necessary must be taken to protect public health. If the concentration in any water sample exceeds the Tier 3, in water supplied to consumers, reasonable measures will be taken to protect public health in consultation with local health professionals.
    Date: Ongoing for the duration of this Notice
  2. Report any Tier 2 PFAS triggers on the Warren Hill 1 Reservoir or Southfields WTW final water to; DWI, UKHSA and Local Authorities as per the reporting requirements.
    Date: Ongoing for the duration of this Notice
  3. Continually appraise the risk of PFAS as a hazard as part of the Regulation 27 Risk Assessment for the supply systems supplied by Southfields raw water Sources, Southfields WTW treated water and Warren Hill 1 Reservoir final water, according to a Drinking Water Safety Plan approach, and ensure that Regulation 28 documents are regularly reviewed and updates provided as necessary.
    Date: Ongoing for the duration of this Notice
  4. Complete the planning, design and procurement arrangements to provide GAC treatment on the Southfields raw water sources.
    Date: 31 July 2027
  5. Complete construction, installation and commissioning of GAC treatment on the Southfields raw water sources.
    Date: 31 March 2030

(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 October 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 Southfields borehole sources, 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 a report confirming completion of the planning, design and procurement arrangements to provide GAC treatment for the Southfields raw water sources.
    Date: 31 August 2027
  3. Provide a report confirm completion of construction, installation and commissioning of the GAC treatment at the Southfields raw water sources. 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.
    • Updating of the Site Operating Manual and removal of all out-of-date material from circulation.
    • Provisions 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 2030
  1. Review the risk assessments for Southfields raw water sources as required by Regulation 27(4)
    Date: 30 April 2030
  2. Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
    Date: 30 November 2024
  3. Submit any revisions of the audit strategy produced under measure (c)2.
    Date: Within 1 month of a revision
  4. 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
  5. Submit a satisfactory completion report accompanied by a revised regulation 28(1) report with Board level Director sign-off.
    Date: 30 April 2031

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
12 August 2024
Reference: ANH-2024-00001

 

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