Notice of Regulation: Portsmouth Water Limited – West Street Treatment Works, Cryptosporidium

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

Reference: PRT-2020-00003

Version Number: 3

Water undertaker as appointed under section 6 of the Water Industry Act 1991 (as amended): Portsmouth Water Limited, with registered number 02536455 (hereinafter called ‘the Company’).

Assets Affected:

Table 1: List of assets affected and associated reference numbers

Asset Name 

Reference 

West Street Treatment Works

TWST

Fareham Supply Zone

ZFAR

Firdown Supply Zone

ZFDR

Gosport Supply Zone

ZGOS

Northbrook Supply Zone

ZNBK

Nelson Supply Zone

ZNEL

West Street catchment

CWST

Firdown Supply System

YWSP-FDR

Hoads Hill Supply System

YWSP-HSH

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 10 February 2020, which states that there is or has been a significant risk of supplying water from West Street 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:

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.

Description of Risk

Hazard/ Hazardous Event/ Parameter

Hazard I D

Catchment risk carried over to treatment

Cryptosporidium

PRT/HSH/TWST/T-IPA-1.3.1

Catchment risk carried over to treatment

Cryptosporidium

PRT/FDR/TWST/T01.1.1

Catchment risk carried over to treatment

Cryptosporidium

PRT/FDR/TWST/T-IPA-1.3.1

Catchment risk carried over to treatment

Cryptosporidium

PRT/HSH/TWST/T01.1.1

Catchment risk carried over to treatment

Cryptosporidium

PRT/HSH/TWST/T01.1.1

Catchment risk carried over to treatment

Cryptosporidium

PRT/HSH/CWST/C01.3.2

Catchment risk carried over to treatment

Cryptosporidium

PRT/HSH/CWST/C02.1.1

Catchment risk carried over to treatment

Cryptosporidium

PRT/FDR/CWST/C24.1.1

Catchment risk carried over to treatment

Cryptosporidium

PRT/FDR/CWST/C-IPA-1.3.1

Catchment risk carried over to treatment

Cryptosporidium

PRT/HSH/CWST/C24.1.1

Catchment risk carried over to treatment

Cryptosporidium

PRT/HSH/CWST/C02.2.1

Catchment risk carried over to treatment

Cryptosporidium

PRT/HSH/CWST/C19.1.5

Catchment risk carried over to treatment

Cryptosporidium

PRT/FDR/CWST/C19.1.5

Catchment risk carried over to treatment

Cryptosporidium

PRT/FDR/CWST/C02.1.1

Catchment risk carried over to treatment

Cryptosporidium

PRT/FDR/CWST/C01.3.2

Catchment risk carried over to treatment

Cryptosporidium

PRT/FDR/CWST/C02.2.1

Catchment risk carried over to treatment

Cryptosporidium

PRT/FDR/RFD1/R01.1.7

  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. Operate a treatment process which meets the requirements of regulation 26 in full, to disinfect the water at all times and under all flow conditions.
    Date: Ongoing for the duration of this Notice
  2. Continuously review all critical control points and mitigation measures.
    Date: Ongoing for the duration of this Notice
  3. Operate all processes within defined operating ranges, with appropriate triggers, responses and contingency procedures.
    Date: Ongoing for the duration of this Notice
  4. Ensure the works control and shutdown system is operational and that monitors are calibrated at the predefined frequencies.
    Date: Ongoing for the duration of this Notice
  5. Continuous monitoring to ensure that water being presented for disinfection is of the required standard to achieve disinfection and to verify that disinfection is taking place and is effective.
    Date: Ongoing for the duration of this Notice
  6. Maintain documented procedures for the escalation and investigation of any deviation from expected results or consumer complaints.
    Date: Ongoing for the duration of this Notice
  7. 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
  8. Enhanced operational water quality monitoring to validate and verify the quality of water entering supply.
    Date: Ongoing for the duration of this Notice
  9. Implement and maintain continuous monitoring for Cryptosporidium.
    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. Produce a Long-Term Action Plan for West Street treatment works to address the risk from Cryptosporidium, incorporating the findings of the reviewed/ new risk assessments (as required) completed under the requirements of Regulation 27(4) Notice PRT-2020-00002.
    Date: Complete
  2. Complete the planning, design and procurement of an effective treatment process for the removal or inactivation of Cryptosporidium to comply with recognised industry good practises and recommendations and to secure the long term protection of human health of those consumers receiving water, for regulation 4(1) purposes, from the associated water supply zones.
    Date: Complete
  3. Complete the construction, installation and commissioning into supply of the chosen solution identified in (b)2. above to mitigate the risk from Cryptosporidium. Commissioning must include the following to account for the changes made:
  4. Updating of the Site-Specific Disinfection Policy and any associated site-specific procedures;
  5. Updating of the Site Operating Manual and removal of all out-of-date material from circulation; and
  6. Provision of adequate training to operators on the chosen solution installed (or modified) and site operating manual under this measure.
  7. 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 West Street 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. Submit a report outlining the findings of the Long-Term Action Plan completed under measure (b)1. and confirm the projected completion dates for measure (b)2. and (b)3.
    Date: Complete
  3. Submit a report outlining the Company’s chosen treatment design specification as defined by measure (b)2, accompanied by an updated audit strategy.
    Date: Complete
  4. Submit a report documenting the completion of measure (b)3.
    Date: Complete
  5. Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
    Date: Complete
  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 October 2022

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
01 June 2022
Reference: PRT-2020-00003 (V3)

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