South East Water Limited – Tilford Meads Treatment Works Arsenic

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

Reference: SEW-2023-00003

Version Number: 2

Water undertaker as appointed under section 6 of the Water Industry Act 1991 (as amended): South East Water Limited, with registered number 02679874 (hereinafter called ‘the Company’).

Assets Affected:

Asset Name

Reference

Tilford Meads Treatment Works

T220

Tilford Water Supply Zone

Z268

Table 1: List of assets affected and associated reference numbers

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 01 January 2023, which states that there is or has been a significant risk of supplying water from Tilford Meads Treatment Works 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 ID

Potential risks to drinking water quality and non-compliance with the Water Supply (Water Quality) Regulations.)

Arsenic

T220-TREATMENT-B001A

Potential risks to drinking water quality and non-compliance with the Water Supply (Water Quality) Regulations.)

Arsenic

Z268-DISTRIBUTION-B001A

Potential risks to drinking water quality and non-compliance with the Water Supply (Water Quality) Regulations.)

Arsenic

Z268-CONSUMER-B001A

Table 2: 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. Optimisation of all existing treatment processes.
    Date: Ongoing for the duration of this Notice
  2. Operation of all processes within defined normal operating ranges with appropriate triggers, responses and contingency procedures.
    Date: Ongoing for the duration of this Notice
  3. Online turbidity and chlorine monitoring with appropriate alarms and failsafe shutdown.
    Date: Ongoing for the duration of this Notice
  4. Enhanced monitoring for arsenic at Tilford Meads Treatment Works (and within zones supplied by Tilford Meads Treatment Works) as defined within the audit strategy.
    Date: Ongoing for the duration of this Notice
  5. Continuously review all critical control points and mitigation measures for the duration of this notice with a view to updating the notice with additional measures where required.
    Date: Ongoing for the duration of this Notice
  6. Operation of all processes within defined operating ranges with appropriate triggers, responses and contingency procedures.
    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. Options appraisal for appropriate start up to waste system.
    Date: 30 June 2023
  2. Inspection and remediation of all boreholes.
    Date: 31 December 2024
  3. Installation of new filter backwash flow meter with appropriate alarm/ control to ensure efficient backwashing of filter media is maintained.
    Date: 31 March 2024
  4. Installation of appropriate start up to waste system as detailed in output from (b)1.
    Date: 31 March 2024
  5. Carry out detailed investigation of each of the pressure filters to highlight any recommended remedial work that is required to enhance asset life.
    Date: 31 May 2024
  6. Installation of new sodium hypochlorite dosing system to cater for pre-chlorination.
    Date: 31 May 2024
  7. Optimisation of soft start drives for borehole pumps.
    Date: 31 May 2024
  8. Installation of new pre filter and post filter iron analyser.
    Date: 30 June 2024
  9. Carry out all remedial work as recommended in measure (b)5.
    Date: 31 July 2024
  10. Replacement of all filter automated valves and actuators.
    Date: 31 July 2024
  11. Replacement of all media in all 16 filters. Two filters to be replaced every 6 weeks.
    Date: 31 July 2024
  12. Installation of new pre filter and post filter chlorine analyser.
    Date: 31 July 2024

(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 June 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 from Tilford Meads Treatment Works, or not to so supply unless the specified conditions below are satisfied:

  1. Not applicable
    Date: 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 appraisal report for start up to waste system, confirming chosen solution and timeframes for installation and commissioning.
    Date: 31 July 2023
  3. Provide report following inspection and remediation of all boreholes.
    Date: 31 January 2025
  4. Provide completion report for installation and commissioning of new filter backwash flow meter with appropriate alarm/ control to ensure efficient backwashing of filter media is maintained.
    Date: 30 April 2024
  5. Provide completion report for installation and commissioning of appropriate start up to waste system.
    Date: 30 April 2024
  6. Provide report following detailed investigation of each of the pressure filters to highlight any recommended remedial work that is required to enhance asset life.
    Date: 30 June 2024
  7. Provide completion report for installation of new sodium hypochlorite dosing system to cater for pre-chlorination.
    Date: 30 June 2024
  8. Provide completion report for optimisation of soft starter drives for borehole pumps.
    Date: 30 June 2024
  9. Provide completion report for installation and commissioning of new pre filter and post filter iron analyser.
    Date: 31 July 2024
  10. Provide completion and commissioning report for all remedial work as recommended in measure (b)5
    Date: 31 August 2024
  11. Provide completion report for replacement and commissioning of all filters automated valves and actuators.
    Date: 31 August 2024
  12. Provide completion report for replacement and commissioning of all media in all 16 filters.
    Date: 31 August 2024
  13. Provide completion report for installation and commissioning of new pre filter and post filter chlorine analyser.
    Date: 31 August 2024
  14. Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
    Date: 31 July 2023
  15. Submit any revisions of the audit strategy produced under measure (c)2.
    Date: Within 1 month of a revision
  16. 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
  17. Submit a satisfactory completion report accompanied by a revised regulation 28(1) report with Board level Director sign-off.
    Date: 31 August 2025

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 February 2024
Reference: SEW-2023-00003 v2

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