Wessex Water Services Limited – Chitterne Works Disinfection Upgrade
Notice under regulation 28(4) of the Water Supply (Water Quality) Regulations 2016 (as amended)
Reference: WSX-2024-00003
Version Number: 1
Water undertaker as appointed under section 6 of the Water Industry Act 1991 (as amended): Wessex Water Services Limited, with registered number 02366648 (hereinafter called ‘the Company’).
Assets Affected:
- T15100665 Chitterne Works
- Y44000024 Zone 27 Chitterne
- Y44000055 Zone 55 Newton Meadows
- Y44000139 Zone 139 Zeals
- Y44000140 Zone 140 Trowbridge
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 12 February 2024, which states that there is or has been a significant risk of supplying water from Chitterne 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 |
|---|---|---|
|
Microbiological |
Inadequate disinfection due to poor/deteriorating water quality |
RSKASMT-0000012635 H033 T15100665 |
- 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:
- Maintain site operating procedures and training documentation.
Date: Ongoing for the duration of this Notice - Ensure the works control and shutdown system is operational and that site monitors are calibrated at predefined frequencies.
Date: Ongoing for the duration of this Notice - Routine operational and regulatory water quality sampling of the raw and treated water to validate that the site is operating according to procedures. Any result detected outside of acceptable limits shall be recorded and published on a daily exception report and investigated.
Date: Ongoing for the duration of this Notice - Increase water quality sampling frequency in response to results detected outside of acceptable limits.
Date: Ongoing for the duration of this Notice - Maintain water quality monitoring at points within the process in order to confirm ongoing compliance with the requirements of regulation 26, with appropriate controls in place to ensure any water deemed unsatisfactory (outside the shutdown criteria) to be captured within the asset and disposed of in a controlled manner.
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:
- Complete the planning, design and procurement for disinfection improvements at Chitterne works
Date: 31 March 2026 - Complete the construction, installation and commissioning of the solution developed in measure b(1), to ensure compliance with Regulation 26. Commissioning must include the following to account for the changes made:
- An appropriate maintenance regime for any installed processes;
- Full integration of the new 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; and
- Provisions of adequate training for all relevant personnel on the operation, repair and maintenance of the installed process and the revised procedures, policies and manual.
Date: 31 March 2028
(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: 30 September 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 Chitterne Works and associated supply systems, 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 to confirm the completion of the planning, design and procurement for disinfection improvements at Chitterne works as specified in measure (b)1.
Date: 30 April 2026 - Provide a report to confirm the completion of the construction, installation and commissioning of the disinfection improvements specified in measure (b)2 at Chitterne works.
Date: 30 April 2028 - Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
Date: 31 October 2024 - Submit any revisions of the audit strategy produced under measure (c)2.
Date: Within 1 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 April 2029
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
3 July 2024
Reference: WSX-2024-00003