has on 21 October 2017 received a report (the “Report”) from Thames Water Utilities Ltd (the “Company”) which states that there is or has been a significant risk of supplying water from the catchments and sites listed in Annex 1 that could constitute a potential danger to human health or could be unwholesome.
GIVES NOTICE to the Company under regulation 28(4) of the Water Supply (Water Quality) Regulations 2016 (as amended) (“the Regulations”) that it must satisfy the following requirements:
For risks associated with:
Site contamination [risk from flooding]
(a) to maintain the following measures for the period specified:
To ensure that wholesome water is supplied to consumers at all times, in accordance with the requirements of regulation 4, maintain existing operational measures which must include the following at all sites (catchments and their corresponding water treatment works as applicable)covered by this Notice: Date: Ongoing for the duration of this Notice
Operation of all processes within defined operating ranges with appropriate triggers, responses and contingency procedures with associated review programmes.
Maintain continuous turbidity monitoring of water prior to disinfection with appropriate alarms and failsafe shutdowns where applicable. Respond to alarms from these monitors as per Company procedures.
Ensure all water treatment works’ control and shutdown systems are operational and that monitors are calibrated at predefined frequencies.
Continuous monitoring of raw and treated water with control systems, alarmed operating limits and automatic shutdown as appropriate.
Ensure that turbidity monitoring equipment is maintained in-line with manufacturers’ instructions.
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. Ensure that any new risk identified is assessed in accordance with the Company’s Drinking Water Safety Plan (DWSP) methodology.
Water quality response procedures for: investigation of contraventions including process optimisation and reporting; customer complaints procedures; event response procedures for event actions and notification criteria.
Up-to-date Site Operating Manual (SOM), defining normal operating ranges, triggers, response and contingency procedures, with controlled update and review programmes.
The Company’s internal waiver process is followed where deviation from the Asset Standard is required. This must not affect compliance with the Regulations.
Up-to-date and subject to continuous review, site specific disinfection policies, which identify clearly and unequivocally how disinfection is achieved at the water treatment works.
Maintain contingency plans to protect human health in the event of a risk to human health associated with drinking water quality, which should include liaison with local authorities and Public Health England to agree any actions needed to protect human health and issuing of advice to consumers, where required.
In accordance with the requirements of regulation 27(3), continuously review and revise as necessary the regulation 27 risk assessments for the sites and submit revised regulation 28 reports to the Inspectorate as necessary, in accordance with the published procedure.
(b) to review, revise or make operational the following measures, by the date specified below:
a) Review all catchments and water treatment works where screening indicates a potential risk from groundwater flooding. Date: 31 March 2019
b) Identify any measures required to address the findings of the review completed under measure (b)1.a) above. Date: 30 June 2019
c) Implement any required measures identified under (b)1.b) above. Date: 31 December 2023
a) Review all catchments and water treatment works where screening indicates a potential risk from fluvial or pluvial flooding. Date: 31 March 2019
b) Identify any measures required to address the findings of the review completed under measure (b)2.a) above. Date: 30 June 2019
c) Implement any required measures identified under (b)2.b) above. Date: 31 December 2023
Measures for Eton abstraction features and Datchet water treatment works
a) Complete a flood risk assessment for Eton abstraction features (including Eton pumping station). Date: Complete
b) Identify any measures required to address the findings of the flood risk assessment completed under measure (b)3.a) above. Date: Complete
c) Implement any required measures identified under (b)3.b) above. Date: 31 March 2020
a) Complete a flood risk assessment of the Datchet boreholes and Datchet water treatment works. Date: 31 March 2019
b) Identify any measures required to address the findings of the flood risk assessment completed under measure (b)4.a) above. Date: 31 March 2019
c) Implement any required measures identified under (b)4.b) above. Date: 31 March 2020
(c) to audit whether the measures have been effective by the following means:
Define a strategy for auditing the effectiveness of the above measures. Date: 31 July 2019
Implement the audit strategy outlined above. Date: Until revocation of this Notice.
(d) not to supply water for regulation 4(1) purposes from sites listed in Annex 1, unless the conditions specified below are satisfied:
(e) to provide the following information in the time and manner specified below to enable monitoring of progress towards the mitigation of the risk of supplying water that would constitute a potential danger to human health:
Provide a progress report annually by 31 January each year after the final notice is served and against the following milestones:
a) Report outlining the findings of the review completed under (b)1.a) and (b)2.a) and the measures to be taken to address any deficiencies identified (as required under measure (b)1.b) and (b)2.b)) and their proposed timescales for delivery. Date: 31 July 2019
b) Confirmation of the completion of any measures required under measure (b)1.c) and (b)2.c). Date: 30 January 2024
c) Report outlining the findings of the flood risk assessment completed under (b)4.a) and the measures to be taken to address any deficiencies identified (as required under measure (b)4.b)) and their proposed timescales for delivery. Date: 30 April 2019
d) Confirmation of the completion of any measures required under measure (b)3(c) and (b)4.c) Date: 30 April 2020
Review the risk assessment for the sites covered by this Notice and their associated supply systems as required by regulation 27(4) and subsequently submit revised regulation 28 reports accompanied by signed board level declarations. Date: From time to time and 2 months after the completion of all measures in section (b)
Submit a satisfactory completion report. Date: 01 March 2025
Failure by the Company to comply with this Notice may result in enforcement proceedings under section 18 of the Act.
Signed by authority of the Secretary of State, Laura Moss Deputy Chief Inspector 08 July 2020 DWI reference: TMS3892 Version 2
Annex 1- Sites
Part I – Catchments and their corresponding water treatment works
Catchments identified by screening as being potentially at risk from flooding.
We use 3 types of cookie. You can choose which cookies you're happy for us to use.
Strictly necessary cookies
These essential cookies do things like remember your progress through a form.
They always need to be on.
Cookies that measure website use
We use Google Analytics to measure how you use the website so we can improve it based on user needs.
Google Analytics sets cookies that store anonymised information about:
how you got to the site
the pages you visit on dwi.gov.uk and how long you spend on each page
what you click on while you're visiting the site
Cookies that help with our communications and marketing
Some dwi.gov.uk pages may contain content from other sites, like YouTube or Flickr, which may set their own cookies. These sites are sometimes called ‘third party’ services. This tells us how many people are seeing the content and whether it’s useful.
In addition, if you share a link to a dwi.gov.uk page, the service you share it on (for example, Facebook) may set a cookie. We have no control over cookies set on other websites - you can turn them off, but not through us.