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Anglian Water Services Limited – Installation of a redox tank and associated catalysts and fittings at Codham WTW – Odour

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

Reference: ANH-2023-00020

Version Number: 1

Water undertaker as appointed under section 6 of the Water Industry Act 1991 (as amended): Anglian Water Services Limited, with registered number 02366656 (hereinafter called ‘the Company’).

Assets Affected:

  • Colchester Bures Supply System (Bocking, Codham and Petches Bridge WTWs) SSC-001-COL 

Asset Name

Reference

Codham Mill Source 

CCOD0WV 

Codham Mill Source Bore 3 

ACOD3CV 

Codham Mill Source Bore 4 

ACOD4CV 

Codham Treated Water 

TCOD 

Panfield Lane Reservoir final water 

TPAN 

Braintree North PWSZ  

ZES35 

Table 1: List of assets affected and associated reference numbers

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 31 March 2023 which states that there is or has been a significant risk of supplying water from Codham Water Treatment Works (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:

Description of Risk

Hazard/ Hazardous Event/ Parameter

Hazard I D

Abnormal change in odour 

Odour 

A003 

Table 2: 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. Regular review and update of the ground water risk assessments. 
    Date: Ongoing for the duration of this Notice
  2. Continue to maintain the odour removal plan, which will be regularly reviewed, for Codham WTW. 
    Date: Ongoing for the duration of this Notice
  3. Operational and regulatory monitoring for odour at the raw water, Codham treated water, Panfield Lane reservoir final water and in the downstream Public Water Supply Zones. 
    Date: Ongoing for the duration of this Notice
  4. Investigate any odour detections at Codham treated water,and  Panfield Lane Reservoir final water monitoring point. 
    Date: Ongoing for the duration of this Notice
  5. Report any odour detections from Panfield Lane Reservoir final water monitoring point to the Inspectorate from enhanced and regulatory sampling within 1 month. 
    Date: Ongoing for the duration of this Notice
  6. Continually appraise the risk of odour as a hazard as part of the Regulation 27 Risk Assessment for the supply systems supplied by Codham WTW and Panfield Lane Reservoir final water, according to a Drinking Water Safety Plan approach, and ensure that Regulation 28 documents are regularly reviewed and updates provided as necessary. 
    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. Complete the planning, design and procurement of a redox tank and associated catalysts and fittings at Codham WTW.
    Date: 30 April 2026
  2. Complete construction, installation and commissioning of a redox tank and associated catalysts and fittings at Codham WTW, designed under measure (b)1. Commissioning must include the following to account for the changes made: 
  • An appropriate maintenance regime for any installed processes;
  • Full integration of the new (or modified) 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 (or modified) process and the revised procedures, policies and manual.

Date: 30 June 2028

(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: 31 March 2024
  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 Codham Water Treatment Works, 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. A statement to confirm completion of the planning, design and procurement arrangements of the redox tank and associated catalysts and fittings at Codham treated water. 
    Date: 31 May 2026
  3. A statement to confirm completion of construction, installation and commissioning of the redox tank and associated catalysts and fittings at Codham WTW.
    Date: 31 July 2028
  4. Review the risk assessments for Codham WTW and Panfield Road Reservoir final water as required by Regulation 27(4).
    Date: 31 July 2028
  5. Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
    Date: 30 April 2024
  6. Submit any revisions of the audit strategy produced under measure (c)2.
    Date: Within 1 month of a revision
  7. 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
  8. Submit a satisfactory completion report accompanied by a revised regulation 28(1) report with Board level Director sign-off.
    Date: 31 July 2029

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
15 January 2024
Reference: ANH-2023-00020

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