Notice of Regulation: Montpelier No.2 Service Reservoir


Bristol Water Plc: Montpelier 2 Service Reservoir

Reference: BRL-2021-00006

Version: 2

Water undertaker as appointed under section 6 of the Water Industry Act 1991 (as amended): Bristol Water Plc, with registered number 02662226 (hereinafter called ‘the Company’).

Assets affected:

  • R019 Montpelier 2 Service Reservoir;
  • Z418 Worle, Weston-Super-Mare Central and North;
  • Y02 Banwell Supply System.
  1. The Drinking Water Inspectorate (‘the Inspectorate’) has received regulation 28(1) reports of the Water Supply (Water Quality) Regulations 2016 (as amended) (‘the Regulations’) from the Company dated 21 August 2016, which states that there is or has been a significant risk of supplying water from Montpelier 2 service reservoir (and associated assets as applicable) that could constitute a potential danger to human health.
  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:



Hazard ID

Description of Risks




Risk of potential corrosion or degradation of construction materials, internal fittings, and pipework in service reservoir.



Presence of invertebrates (e.g.asellus) in service reservoir from August 2020 ROV survey.

Total Coliforms

E. coli



To address the potential risk of ingress.

  1. The Company are required to satisfy the following:


(a) to maintain the following measures for the period specified in each case:

  1. Maintain enhanced sampling (in addition to routine regulatory sampling) for microbiological parameters, Total Coliforms, E. coli, and chlorine residuals at Montpelier 2 service reservoir.
    Date: Ongoing until completion of measure (e)5.
  2. Maintain proactive external inspections at Montpelier 2 service reservoir including:
    Date: Ongoing for the duration of this notice
    • Grounds maintenance;
    • Site security checks;
    • Inspection of hatches and seals;
    • Inspection of redundant assets;
    • Inspection of sample taps and operational equipment;
    • Periodic inspection of overflow/washout, and upstream air valves.
  3. Maintain appropriate contingency plans to ensure drinking water quality and sufficiency can be maintained in the event of a risk associated with drinking water quality, in line with industry good practice.
    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. Carry out a test isolation of Montpelier No.2 reservoir and monitor the associated supply system to determine if there is sufficient resilience when the reservoir is out of service and any potential risks to water quality.
    Date: Complete
  2. Update the company’s drinking water safety plan considering the outcomes of the test isolation to remove the reservoir ahead of inspection to recognise any additional risks and required mitigation.
    Date: Complete
  3. Based on the findings of the test isolation in (b)1 and risk assessment in (b)2, develop a plan of the enabling works required to remove Montpelier 2 from supply for physical internal inspection, clean and integrity testing. To include risk assessment of any required enabling work in the network and implementation of additional control measure to minimise the risks to water quality associated with changing network pressures.
    Date: Complete
  4. Implement the plan developed in (b)3. to remove Montpelier 2 from supply and conduct a physical internal inspection and clean of the reservoir and conduct integrity testing (following 5.1 of the company’s Written Scheme of Examination Potable Water storage structures) to identify any potential points of ingress. Carry out any remedial work required before returning the asset to service.
    Date: Complete

(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 Montpelier 2 Service Reservoir, 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:

  1. Provide a progress report annually by 31 January and against the following milestones:
    Date: Annually by 31 January
    • Provide a report summarising the findings of the test isolation carried out and the plan for the isolation and internal inspection of Montpelier No.2 reservoir. Confirm the date for measure (b)4. the isolation and physical internal inspection of the reservoir. Provide an updated regulation 28(1) report following the company’s drinking water safety plan update as required in measure (b)2.
      Date: Complete
  2. Submit the strategy for auditing the effectiveness of the measures, as specified in (c)1.
    Date: Complete
  3. Submit any revisions of the audit strategy produced under measure (c)2.
    Date: Within 1 month of a revision
  4. Submit a report in the event that any completed measure of this Notice needs to be altered in any way for any reason.
    Date: Ongoing for the duration of this Notice
  5. Following completion of the internal inspection submit a satisfactory completion report (including inspection report, inundation test report, confirmation of clean and evidence that any required remedial work has been completed) accompanied by a revised regulation 28(1) report with Board level Director sign-off.
    Date: 30 April 2022

  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).

Nick Adjei
Deputy Chief Inspector, on behalf of the Secretary of State for Environment, Food and Rural Affairs
17 March 2022
Reference: BRL-2021-00006
Version 2

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