Southern Water Services Limited – Patcham Water Supply Works
Notice under regulation 28(4) of the Water Supply (Water Quality) Regulations 2016 (as amended)
Reference: SRN-2018-00032
Version Number: 5
Water undertaker as appointed under section 6 of the Water Industry Act 1991 (as amended): Southern Water Services Limited, with registered number 02366670 (hereinafter called ‘the Company’).
Assets Affected:
- TS033 Patcham Water Supply Works
- Y007 Sussex East
Details of this Notice:
- 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 28 December 2017, which states that there is or has been a significant risk of supplying water from Patcham Water Supply Works (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 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 |
|---|---|---|
|
Increasing nitrate in source waters |
Nitrate |
49267 |
|
Ingress route and failure of treatment process |
Clostridium perfringens |
44283 |
|
Ingress route and failure of treatment process |
E. coli |
44286 |
|
Ingress route and failure of treatment process |
Enterococci |
44287 |
|
Ingress route and failure of treatment process |
Total coliforms |
44285 |
|
Failure of treatment poses risk to wholesomeness |
Lead |
44318 |
|
Ingress route and failure of treatment process |
Pesticides |
44297 |
|
Insufficient water supply to downstream consumers |
No Supply |
44344, 44341 |
- 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:
- Perform enhanced sampling and monitoring (once available) for nitrate at Patcham WSW.
Date: Ongoing for the duration of this Notice - Monitoring and reporting the impact on any changes made.
Date: Ongoing for the duration of this Notice - Implement an enhanced monitoring strategy for nitrate to include the monitoring of all high-risk raw water sources and associated final waters on a weekly basis to supplement the current regulatory treated water monitoring.
Date: Ongoing for the duration of this Notice - Report all exceedances of the nitrate parameter to the Local Authority and Health Protection team and agree further additional steps to protect public health as appropriate.
Date: Ongoing for the duration of this Notice - Report all regulatory exceedances of the standards for the nitrate parameter to DWI as part of current monthly exception reporting process.
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:
- Install online monitoring and corresponding control system at Patcham WSW by the 31 December 2020.
Date: Complete - Complete investigation into atrazine risk at Surrenden Underground Source to determine if GAC treatment is required.
Date: Complete - Confirm location and scope of solution identified to mitigate the risk related to nitrate and atrazine at Patcham WSW.
Date: Complete - Complete SE102-1 – Dumb well as identified by HazRev.
Date: 31 July 2023 - Complete SE0110 – Patcham WSW- Phosphate Dosing Monitor as identified by HazRev.
Date: 30 November 2023 - Commission SE102-1 – Dumb well as identified by HazRev
Date: 29 February 2024 - Complete works to mitigate risk to Nitrate and Atrazine, identified in (b)3.
Date: 31 March 2024 - Complete the following measures as identified by the HazRev process:
- New-49a – Booster/High Lift Pumps control philosophy
- SE0106 – Patcham WSW Surrenden Borehole Restricted DO
- SE0107 – Patcham WSW Surrenden UGS PLC Replacement
Date: 31 March 2024
- Commission SE0110 – Patcham WSW- Phosphate Dosing Monitor as identified by HazRev.
Date: 31 May 2024 - Commission works to mitigate risk to Nitrate and Atrazine, identified in (b)3.
Date: 30 June 2024 - Commission all measures included in (b)8.
Date: 30 September 2024 - Complete the following measures as identified by the HazRev process:
- SE0102-3 Patcham WSW Dumb Well
- SE0103 Patcham WSW Well B
Date: 31 July 2025
- Commission all measures included in (b)12.
Date: 31 January 2026
(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: 30 June 2023 - 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 Patcham Water Supply 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 - The company shall provide an overview of its operational strategy for maintaining nitrate below the standard prescribed by the Water Supply (Water Quality) regulations 2016 (as amended).
Date: Complete - Submit report to confirm installation of online monitoring and corresponding control system at Patcham Water Supply Works.
Date: Complete - Submit report to confirm outcome of investigation (b)2 and to provide confirmation of locations and scope of additional treatment for nitrate and atrazine including treatment capacity.
Date: Complete - Submit a report to confirm completion of SE102-1 – Dumb well as identified by HazRev.
Date: 31 August 2023 - Submit a report to confirm completion of SE0110 – Patcham WSW- Phosphate Dosing Monitor as identified by HazRev.
Date: 31 January 2024 - Submit a report to confirm commissioning of SE102-1 – Dumb well as identified by HazRev.
Date: 31 March 2024 - Submit a report to confirm completion of works to solution for nitrate and atrazine.
Date: 30 April 2024 - Submit a report to confirm completion of New-49a, SE106 and SE107 as identified by HazRev.
Date: 30 April 2024 - Submit a report to confirm commissioning of SE0110 – Patcham WSW- Phosphate Dosing Monitor as identified by HazRev.
Date: 30 June 2024 - Submit a report to confirm commissioning of works to solution for nitrate and atrazine.
Date: 30 June 2024 - Submit a report to confirm commissioning of measures included in (b)8.
Date: 31 October 2024 - Submit a report to confirm completion of SE102-3 and SE103 as identified by HazRev.
Date: 31 August 2025 - Submit a report to confirm commissioning of measures included in (b)12.
Date: 28 February 2026 - Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
Date: 30 June 2023 - 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: 28 February 2027
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 Secretary of State, 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 Secretary of State for Environment, Food and Rural Affairs
26 May 2023
Reference: SRN-2018-00032 V5