Anglian Water Services Limited – Buckingham Water Supply Zone

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

Reference: ANH-2022-00006

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:

  1. Deanshanger Reservoir 1 – RDER1
  2. Deanshanger Reservoir 2 – RDER2
  3. Maidford Reservoir – RMAR0
  4. Buckingham WSZ – ZRW20
  5. Ruthamford Supply system – YRUT

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 1 September 2022, which states that there is or has been a significant risk of supplying water to Buckingham WSZ (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

Deanshanger Service Reservoir 1

Booster disinfection failure at SP (hypo) (PCV breach)

Clostridium Perfringens (Sulphate-reducing Clostridia) (confirmed)

Total Coliforms (Confirmed)

E. coli (faecal coliforms Confirmed)

ANH-RDER1-C004A-ST0095

ANH-RDER1-C001-ST0111

ANH-RDER1-C002-ST0182

Operational Risk

Total Coliforms (Confirmed)

E. coli (faecal coliforms Confirmed)

ANH-RDER1-C001-ST0914

ANH-RDER1-C002-ST0916

Low CL Residual (WQ Incident)

Total Coliforms (Confirmed)

ANH-RDER1-C001-ST0905

Baseline Risk

Total Coliforms (Confirmed)

E. coli (faecal coliforms Confirmed)

ANH-RDER1-C001-ST0931

ANH-RDER1-C002-ST0933

Deanshanger Service Reservoir 2

Booster disinfection failure at SP (hypo) (PCV breach)

Clostridium Perfringens (Sulphate-reducing Clostridia) (confirmed)


Total Coliforms (Confirmed)

E. coli (faecal coliforms Confirmed)

ANH-RDER2-C004A-ST0095

ANH-RDER2-C001-ST0111

ANH-RDER2-C002-ST0182

Baseline risk

Total Coliforms (Confirmed)

E. coli (faecal coliforms Confirmed)

ANH-RDER2-C001-ST0931

ANH-RDER2-C002-ST0933

Operational risk

Total Coliforms (Confirmed)

E. coli (faecal coliforms Confirmed)

ANH-RDER2-C001-ST0914

ANH-RDER2-C002-ST0916

Low CL residual (WQ Incident)

Total Coliforms (Confirmed)

ANH-RDER2-C001-ST0905

Maidford Service Reservoir

Baseline risk

Clostridium Perfringens (Sulphate-reducing Clostridia) (confirmed)

ANH-RMAR0-C004A-ST0974

Failure at Upstream asset (PCV breach)

Total Coliforms (Confirmed)

ANH-RMAR0-C001-ST0115

Low CL residual (WQ Incident)

Total Coliforms (Confirmed)

ANH-RMAR0-C001-ST0905

Operational risk

Total Coliforms (Confirmed)

E. coli (faecal coliforms Confirmed)

ANH-RMAR0-C001-ST0914

ANH-RMAR0-C002-ST0916

Regrowth (PCV breach)

E. coli (faecal coliforms Confirmed)

ANH-RMAR0-C002-ST0193

Baseline risk

Total Coliforms (Confirmed)

E. coli (faecal coliforms Confirmed)

ANH-RMAR0-C001-ST0913

ANH-RMAR0-C002-ST0933

Buckingham PWSZ

Baseline risk

Clostridium Perfringens (Sulphate-reducing Clostridia) (confirmed)


Coliform Bacteria (Indicator)

E. coli (faecal coliforms Confirmed)

ANH-ZRW20-C004A-DI1115

ANH-ZRW20-C001A-DI1072

ANH-ZRW20-C002-DI1074

Failure at Upstream asset (PCV breach)

Clostridium Perfringens (Sulphate-reducing Clostridia) (confirmed)


Coliform Bacteria (Indicator)

ANH-ZRW20-C004A-DI0098

ANH-ZRW20-C001A-DI0110

Operational Risk

Coliform Bacteria (Indicator)

E. coli (faecal coliforms Confirmed)

ANH-ZRW20-C001A-DI1059

ANH-ZRW20-C002-DI1061

Low CL Residual (WQ Incident)

Coliform Bacteria (Indicator)

ANH-ZRW20-C001A-DI1042

Repaired main (PCV Breach)

Coliform Bacteria (Indicator)

E. coli (faecal coliforms Confirmed)

ANH-ZRW20-C001A-DI0119

ANH-ZRW20-C002-DI0188

Mains rehabilitation work (PCV Breach)

Coliform Bacteria (Indicator)

E. coli (faecal coliforms Confirmed)

ANH-ZRW20-C001A-DI0117

ANH-ZRW20-C002-DI0186

Low CL residual (PCV Breach)

Coliform Bacteria (Indicator)

E. coli (faecal coliforms Confirmed)

ANH-ZRW20-C001A-DI0114

ANH-ZRW20-C002-DI0183

Regrowth (PCV Breach)

Coliform Bacteria (Indicator)

E. coli (faecal coliforms Confirmed)

ANH-ZRW20-C001A-DI0118

ANH-ZRW20-C002-DI0187

Burst Main (PCV Breach)

Coliform Bacteria (Indicator)

E. coli (faecal coliforms Confirmed)

ANH-ZRW20-C001A-DI0105

ANH-ZRW20-C002-DI0174

Depressurisation (PCV Breach)

Coliform Bacteria (Indicator)

E. coli (faecal coliforms Confirmed)

ANH-ZRW20-C001A-DI0107

ANH-ZRW20-C002-DI0176

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 is 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. Maintain target network chloramine residuals within Buckingham PWSZ
    Date: Ongoing for the duration of this notice
  2. Ensure continued operation of Deanshanger Service reservoir chloramination booster station at target set points.
    Date: Ongoing for the duration of this notice
  3. Periodically complete chlorine decay testing to monitor effectiveness of mains conditioning as part of validating planned proactive maintenance within Buckingham PWSZ, at frequency defined in the audit strategy.
    Date: Ongoing for the duration of this notice
  4. Complete enhanced sampling of Buckingham PWSZ to monitor bacteriological concentrations within network, as defined in the audit strategy.
    Date: Ongoing for the duration of this notice
  5. Continue to work with HS2 depots supplied from the Buckingham PWSZ to ensure usage and hydrant activity is not having a negative impact on the supply to consumers. Ensure other third-party use of the network is done responsibly by trained operatives with the correct equipment.
    Date: Ongoing for the duration of this notice
  6. Maintain locking caps on washouts and hydrants where caps are determined necessary.
    Date: Ongoing for the duration of this notice
  7. Maintain suitable pump control settings at Thorpe Lodge WR to ensure the necessary amount of water is supplied to Buckingham PWSZ at periods of high demand.
    Date: Ongoing for the duration of this notice
  8. Maintain optimised amendments to pump control at Livingstone Lovell boosters to ensure reduced pressures within the localised network at Maidford service reservoir.
    Date: Ongoing for the duration of this notice
  9. Maintain effective communication plan for consumers and stakeholders within Buckingham PWSZ whilst noticed deliverables completed.
    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:

Air Entrapment and Pressure Solutions

  1. Implement remedial solutions to prevent air entrapment from pressure effects during high demand periods within the Buckingham PWSZ.
    Date: 31 March 2023
  2. Review the current pressure sustaining valve arrangements on HS2 compound connections and determine whether further work is required to protect the network from depressurisation risks. The review is to include performance during the summer demand period 2023.
    Date: 30 November 2023
  3. Complete optimisation investigation of Thorpe Lodge boosters within Buckingham PWSZ.
    Date: Complete
  4. Following (b)3. determine action plan for Thorpe Lodge Boosters to ensure suitable pump control settings to maintain necessary amount of water in Buckingham PWSZ at periods of high demand.
    Date: Complete
  1. Following (b)4. implement action plan for Thorpe Lodge Boosters.
    Date: 31 March 2023
  1. Deliver the connection of two reinforcement mains to protect the Buckingham PWSZ network from additional demand caused by HS2 construction activities.
    Date: 31 December 2022

Proactive Planned Maintenance and Mains Enhancements

  1. Develop a proactive planned maintenance mains conditioning and flushing programme for the Boddington DMA, Weedon Lois DMA, Maidford DMA and the main upstream of Maidford storage reservoir, within the Buckingham PWSZ.
    Date: 31 December 2022
  2. Deliver a proactive planned maintenance mains conditioning and flushing programme for the Boddington DMA, Weedon Lois DMA, Maidford DMA and the main upstream of Maidford storage reservoir, within the Buckingham PWSZ. developed in (b)7.
    Date: 31 May 2023
  3. Determine appropriate mains cleaning technique for outlet mains on Maidford service reservoir.
    Date: 31 March 2023
  4. Following completion of (b)9. deliver mains cleaning on outlets mains on Maidford service reservoir.
    Date: 31 May 2023
  5. Review the suitability of asbestos cement main material used within the Buckingham PWSZ in relation to the risk of burst mains and consequences from high ambient temperatures and high soil moisture deficit.
    Date: Complete
  6. Following delivery of (b)11. identify sections of asbestos cement main for renewal within Buckingham PWSZ.
    Date: Complete
  7. Deliver renewal of asbestos cement mains identified in step (b)12. within Buckingham PWSZ. Deliver renewal of cast iron main section downstream of the Lillingstone Lovell Booster.
    Date: 31 March 2025
  8. Evaluate the main diameters at the high elevations within the Buckingham PWSZ and whether mains abandonment or downsizing is required.
    Date: Complete
  9. Following delivery of (b)14. identify sections of main for downsizing or abandonment.
    Date: Complete

Maintaining Network Residual

  1. Deliver an upgraded Chloramination booster station at Deanshanger service reservoir to maintain a suitable network residual and prevent biofilm growth within Buckingham PWSZ and Maidford Service Reservoir. Installation of booster chloramination should operate on residual control rather than current set point dose.
    Date: 31 May 2023
  2. Update the 2014 network modelling to determine the age of water in the Deanshanger service reservoirs (1 and 2), Maidford service reservoir and across the Buckingham PWSZ.
    Date: Complete
  3. Undertake a review of the chloramine residuals in the Deanshanger service reservoirs (1 and 2), Maidford service reservoir and across the Buckingham PWSZ. Taking into account any improvement in chloramine residuals following the delivery of the mains conditioning and flushing activities and the upgrading of Deanshanger booster chloramination.
    Date: 30 September 2023
  4. Complete an appraisal of outcomes from delivery of (b)17. and (b)18. And determine whether any further remedial actions are required to maintain water quality within the Buckingham PWSZ. Provide plan of work for actions.
    Date: 31 October 2023
  5. Deliver remedial actions as defined by (b)19. if required
    Date: 31 March 2025

(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: 28 February 2023
  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 to Buckingham PWSZ, 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 report evidencing all milestones completed by 31 December 2022, including completed measures prior to notice being served.
    Date: 31 January 2023
  3. Provide report evidencing all milestones completed by 31 March 2023.
    Date: 30 April 2023
  4. Provide report evidencing all milestones completed by 31 May 2023.
    Date: 30 June 2023
  5. Provide report evidencing all milestones completed by 31 October 2023.
    Date: 30 November 2023
  6. Provide report evidencing all milestones completed by 30 November 2023.
    Date: 31 December 2023
  7. Provide report evidencing all milestones completed by 31 March 2025.
    Date: 30 April 2025
  8. Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
    Date: 31 March 2023
  9. Submit any revisions of the audit strategy produced under measure (c)2.
    Date: Within 1 month of a revision
  10. 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
  11. Submit a satisfactory completion report accompanied by a revised regulation 28(1) report with Board level Director sign-off.
    Date: 30 April 2026

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
16 December 2022
Reference: ANH-2022-00006 V1

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