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Severn Trent Water Limited: Bamford WTW

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

Reference: SVT-2021-00005

Version Number: 3

Water undertaker as appointed under section 6 of the Water Industry Act 1991 (as amended): Severn Trent Water Limited, with registered number 02366686 (hereinafter called ‘the Company’).

Assets Affected:

  1. Bamford WTW (T0172)

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 4 May 2021, which states that there is or has been a significant risk of supplying water from Bamford WTW (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:

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.

Description of Risk

Hazard/ Hazardous Event/ Parameter

Hazard I D

Event 2021/ 7960 – Failure of operation of clarification (DAF)

Turbidity

T0172-220-T-A002A-A002-104,

T0172-220-T-A002A-A002-004,

T0172-220-T-H057-A002-004.

Event 2020/7521

Iron (Total)

T0172-220-T-H057-A022-01A,

T0172-220-T-A022-A022-01A,

T0172-220-T-A022,

220-T-A022-A022-01A,

220-T-A022,

220-T-H057-A022-01A.

Event 2020/7521

Iron (Dissolved)

T0172-220-T-A022-A022-01B,

220-T-A022-A022-01B.

Event 2020/7861 – Failure of operation of disinfection.

E.coli (faecal coliforms confirmed)

T0172-220-T-C111-C002-23Q,

T0172-220-T-H035-C002-23Q,

220-T-C111-C002-23Q,

220-T-H035-C002-23Q,

Event 2020/7861 – Failure of operation of disinfection

Total Coliforms (confirmed)

T0172-220-T-H035-C001-23P,

220-T-H035-C001-23P.

Event 2020/7861 – Failure of operation of disinfection

Enterococci (Confirmed)

T0172-220-T-C111-C003-2Q2,

T0172-220-T-H035-C003-2Q2,

220-T-C111-C003-2Q2,

220-T-H035-C003-2Q2.

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. Ensure an electrician will be on site for any power switching activities.
    Date: Ongoing for the duration of this Notice
  2. Optimisation of existing process to prevent improperly disinfected water from leaving the treatment works.
    Date: Ongoing for the duration of this Notice
  3. Review and optimisation of the existing water quality alarms.
    Date: Ongoing for the duration of this Notice
  4. Continue to operate the treatment works in accordance with company procedures.
    Date: Ongoing for the duration of this Notice
  5. Appropriate and timely samples in the event of any water quality issues.
    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. Automation of DAF Stream 1 and 2 outlet valve/penstocks to enable manual instigation of DAF outlet shutdown from the control room.
    Date: Complete
  2. Install additional Uninterruptible Power Supply (UPS) at the filtration stage.
    Date: Complete
  3. Provide a contingency plan to cover all scenarios and prevent the supply of improperly disinfected water.
    Date: Complete
  4. Complete the detailed design of the treatment works resilience scheme, to include new failsafe system, run to waste system and division of works into two independent treatment streams.
    Date: Complete
  5. Complete the installation and commissioning of the resilience scheme as designed in step 4 above.
    Date: 31 August 2025
  6. Update the treatment works policies and procedures to reflect the changes made to the treatment works, including providing any relevant additional training to staff, based on the changes made.
    Date: 31 August 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: Complete
  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 Bamford WTW, 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 on the completion of the automation of DAF Stream 1 and 2 outlet valve/penstocks to enable manual instigation of DAF outlet shutdown from the control room completed for measure (b)1.
    Date: Complete
  3. Provide a report on the installation of the UPS at the filtration stage.
    Date: Complete
  4. Provide a report on the contingency plan as designed in step (b)3 above.
    Date: Complete
  5. Provide a report on the completed resilience scheme design as specified in (b)4 above.
    Date: Complete
  6. Provide a report confirming completion of all work and associated commissioning and training.
    Date: 30 September 2025
  7. Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
    Date: Complete
  8. Submit any revisions of the audit strategy produced under measure (c)2.
    Date: Within 1 month of a revision
  9. 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
  10. Submit a satisfactory completion report accompanied by a revised regulation 28(1) report with Board level Director sign-off.
    Date: 30 September 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
11 November 2024
Reference: SVT-2021-00005 v3

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