Dwr Cymru Cyfyngedig – AMP8 UV Disinfection Schemes
Notice under regulation 28(4) of the Water Supply (Water Quality) Regulations 2018
Reference: DWR-2023-00011
Version Number: 2
Water undertaker as appointed under section 6 of The Water Industry Act 1991 (as amended): Dwr Cymru Cyfyngedig, with registered number 02366777 (hereinafter called ‘the Company’).
Assets Affected:
|
Asset Name |
Reference |
|---|---|
|
Wye at Hereford |
C54069 |
|
Broomy Hill WTW Final |
T54063 |
|
River Dee |
C706102 |
|
Bretton WTW Final |
T706125 |
|
Wye at Monmouth |
C48694 |
|
Monmouth WTW Final |
T54494 |
|
Teme at Whitbourne |
C54715 |
|
Whitbourne WTW Final |
T54712 |
Details of this Notice:
- The Drinking Water Inspectorate (‘the Inspectorate’) has received a regulation 28(1) report of the Water Supply (Water Quality) Regulations 2018 (‘the Regulations’) from the Company dated 31 July 2023, which states that there is or has been a significant risk of supplying water from the water treatment works listed in table 1, above (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 Welsh Ministers, under regulation 28(4) for the assets listed above, for risks associated with:
|
Water Treatment Works |
Hazard/ Hazardous Event/ Parameter |
Hazard I D | |
|---|---|---|---|
|
Broomy Hill WTW |
Risk of crypto breakthrough through exisiting treatment processes into final water. Potential for elevated levels of Cryptosporidium due to its presence in the raw water |
Cryptosporidium |
D74921 |
|
Broomy Hill WTW |
Risk of crypto breakthrough through exisiting treatment processes into final water. Risk of Insufficient Protozoan (crypto) log reduction and inability to meet Reg 26 based target. |
Cryptosporidium |
D189894 |
|
Bretton WTW |
Risk of crypto breakthrough through exisiting treatment processes into final water. Potential for elevated levels of Cryptosporidium due to its presence in the raw water |
Cryptosporidium |
D74721 |
|
Bretton WTW |
Risk of crypto breakthrough through exisiting treatment processes into final water. Risk of Insufficient Protozoan (crypto) log reduction and inability to meet Reg 26 based target. |
Cryptosporidium |
D186646 |
|
Monmouth WTW |
Risk of crypto breakthrough through exisiting treatment processes into final water. Potential for elevated levels of Cryptosporidium due to its presence in the raw water |
Cryptosporidium |
D74446 |
|
Monmouth WTW |
Risk of crypto breakthrough through exisiting treatment processes into final water. Risk of Insufficient Protozoan (crypto) log reduction and inability to meet Reg 26 based target. |
Cryptosporidium |
D189893 |
|
Whitbourne WTW |
Risk of crypto breakthrough through exisiting treatment processes into final water. Potential for elevated levels of Cryptosporidium due to its presence in the raw water |
Cryptosporidium |
D74956 |
|
Whitbourne WTW |
Risk of crypto breakthrough through exisiting treatment processes into final water. Risk of Insufficient Protozoan (crypto) log reduction and inability to meet Reg 26 based target. |
Cryptosporidium |
D189895 |
- 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:
- Continue to optimise each existing treatment process to minimise the risk of cryptosporidium entering supply.
Date: Ongoing for the duration of this Notice - Continuous monitoring of each WTW final water listed in the notice for Cryptosporidium. Weekly E.coli samples of the raw water sources will also be taken as a surrogate for Cryptosporidium.
Date: Ongoing for the duration of this Notice - Monthly data review, flag and investigation process. Where flags cannot be resolved, actions to be completed within 6 months:
Flow cytometry,
Install particle counters,
Additional sampling,
Verification of process stage log removal
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:
- Review and confirm the appropriateness of the proposed solution to install duty/standby (two), validated, ultraviolet reactors and associated equipment at each of the water treatment works listed in this notice.
Date: 30 April 2025 - Complete the design and set expected start date for construction for Broomy Hill WTW, Monmouth WTW and Whitbourne WTW.
Date: 30 April 2026 - Complete the design and set expected start date for construction for Bretton WTW.
Date: 30 April 2027 - Complete the construction and commissioning of the ultraviolet disinfection systems at Broomy Hill WTW, Monmouth WTW and Whitbourne WTW.
Date: 31 March 2028 - Complete the construction and commissioning of the ultraviolet disinfection systems at Bretton WTW
Date: 31 March 2029
(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: 31 May 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 Bretton, Broomy Hill, Monmouth and Whitbourne Water Treatment Works, 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. - Report on the review and confirmation of the appropriateness of the proposed solution to install duty/standby (two), validated, ultraviolet reactors and associated equipment at each of the water treatment works listed in this notice.
Date: 31 May 2025 - Report on the completion of the design and (provide a copy). Detail expected start date for construction for Broomy Hill WTW, Monmouth WTW and Whitbourne WTW.
Date: 31 May 2026 - Report on the completion of the design and (provide a copy). Detail expected start date for construction for Bretton WTW.
Date: 31 May 2027 - Report on the completion of the construction and commissioning of the ultraviolet disinfection systems at Broomy Hill WTW, Monmouth WTW and Whitbourne WTW.
Date: 30 April 2028 - Report on the completion of the construction and commissioning of the ultraviolet disinfection system at Bretton WTW.
Date: 30 April 2029 - Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
Date: 30 June 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 2030
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 Welsh Ministers, 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).
Signed
Nicholas Adjei
Deputy Chief Inspector, on behalf of the Welsh Ministers
05 April 2024
DWR-2023-00011 v2