Severn Trent Water Limited – Frankley WTW Iron
Notice under regulation 28(4) of the Water Supply (Water Quality) Regulations 2016 (as amended)
Reference: SVT-2024-00013
Version Number: 1
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:
- Frankley WTW Gravity and Pumped – T0082
- Frankley WTW PWR – T0236
Details of this Notice:
- 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 09 November 2023, which states that there is or has been a significant risk of supplying water from Frankley Water Treatment Works (and associated assets as applicable) that could constitute a potential danger to human health or could be unwholesome.
- 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 |
|---|---|---|
|
Failure of coagulation and clarification process |
Iron dissolved |
T0082-271-T-A022-A022A-01B |
|
T0236-271-T-A022-A022A-01B | ||
|
Iron total |
T0082-271-T-A022-A022-01A | |
|
T0236-271-T-A022-A022-01A | ||
|
Turbidity |
T0082-271-T-A002A-A002-004 | |
|
T0236-271-T-A002A-A002-004 |
- 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:
- Take all reasonable operational steps (and continue to enhance the effectiveness) to ensure that water that is not compliant with the requirements of regulations 4 and 26 is prevented from entering supply
Date: Ongoing for the duration of this notice - Operation of all processes within defined operating ranges with appropriate triggers, responses and contingency procedures.
Date: Ongoing for the duration of this notice - Up-to-date and subject to continuous review, site specific disinfection policy, which identifies clearly and unequivocally how disinfection is achieved at the works.
Date: Ongoing for the duration of this notice - Maintain contingency plans (including liaison with relevant stakeholders as appropriate) to protect human health.
Date: Ongoing for the duration of this notice - Continuous monitoring of iron and turbidity at the point where water leaves the treatment works, linked to appropriate alarms and action triggers.
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:
- Conduct a review of the operation of flow through the works to meet demand within the downstream network.
Date: 31 October 2024 - Conduct a critical review of the operation of the coagulation/clarification stage of treatment to improve control measures to prevent elevated iron and turbidity leaving the works to ensure compliance with regulation 4 and regulation 26. Identify whether any alterations are required to the treatment process.
Date: 30 November 2024 - Design a solution to address any risks identified through the completion of the review required under measure (b)1.
Date: 31 May 2025 - Implement or install and commission (as appropriate) the chosen solution designed under measure (b)2.
Date: 31 May 2027 - Conduct a review of systems for alarm generation on all interfaces between the original and newer processes or upgrades at the works.
Date: 28 February 2025 - Complete a review of the Control Philosophy and Functional Design Specification of the upgraded coagulant dosing system to identify any required software amendments.
Date: 31 October 2024 - Implement and complete end to end testing of software changes identified in measure (b)6.
Date: 31 December 2025 - Complete hardware installation to allow physically separate Programmable Logic Controllers (PLC) for DAF Stream 1 and DAF Stream 2.
Date: 31 March 2025 - Conduct a review of the run to waste system including operational capacity in light of the previous events.
Date: 31 October 2024
(c) To audit whether the measures have been effective by the following means:
- Define an audit strategy to monitor the effectiveness of the measures specified in sections (a) and (b).
Date: 31 October 2024 - 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 Frankley WTW, or not to so supply unless the specified conditions below are satisfied:
- 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:
- Provide a progress report annually.
Date: by 31 January each year. - Provide a report on the review of the operation of flow through the works to meet demand within the downstream network.
Date: 30 November 2024 - Provide a report on the review of the operation of the coagulation/ clarification stage of treatment and any identified alterations that are required to the treatment process.
Date: 31 December 2024 - Provide a report on the designed solution to address any risks identified in measure (b)2.
Date: 30 June 2025 - Provide a report confirming the installation or implementation of the chosen solution.
Date: 30 June 2027 - Provide a report on the review of process control and systems for alarm generation.
Date: 31 March 2025 - Provide a report on the review of the Control Philosophy and Functional Design Specification of the upgraded coagulant dosing system and any required software amendments.
Date: 30 November 2024 - Provide a report confirming the implementation and completion of end to end testing of software changes identified in measure (b)6.
Date: 31 January 2026 - Provide a report confirming installation of separate PLCs for DAF Stream 1 and DAF Stream 2.
Date: 30 April 2025 - Provide a report on the review of the run to waste system.
Date: 30 November 2024 - Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
Date: 30 November 2024 - Submit any revisions of the audit strategy produced under measure (c)2.
Date: Within one month of a revision - 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 - Submit a satisfactory completion report accompanied by a revised regulation 28(1) report with Board level Director sign-off.
Date: 30 June 2028
Further Details of this notice:
- Any product or substance used as a result of the requirements in this notice must comply with regulation 31.
- 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.
- 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).
Nicholas Adjei
Deputy Chief Inspector, on behalf of the Secretary of State for Environment, Food and Rural Affairs
27 August 2024
Reference: SVT-2024-00013