Southern Water Services Limited – Ground Water Treatment Works HazRev Delayed Actions
Notice under regulation 28(4) of the Water Supply (Water Quality) Regulations 2016 (as amended)
Reference: SRN-2025-00008
Version Number: 1
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:
Asset Name | Reference |
---|---|
Angmering WSW | TS018 |
Balsdean WSW | TS036 |
Bottom Pond WSW | TK021 |
Bush Road Cuxton WSW | TK002 |
Calbourne WSW | TI005 |
Clapham WSW | TS019 |
Easton WSW | TH007 |
Falmer WSW | TS037 |
Findon Road WSW | TS021 |
Flemings WSW | TK024 |
Higham WSW | TK007 |
Ibthorpe WSW | TH013 |
Knighton WSW | TI009 |
London Road WSW | TK018 |
Lower Bush Cuxton WSW | TK039 |
Martin Mill WSW | TK027 |
Newmarket Lewes B WSW | TS044 |
Newmarket Lewes C WSW | TS039 |
Northfleet WSW | TK014 |
Overton WSW | TH016 |
Patching WSW | TS020 |
River Way Andover WSW | TH010 |
Rotherfield WSW | TS006 |
Selling WSW | TK041 |
Southover WSW | TS040 |
Sparrow Castle WSW | TK032 |
Stanhope Lodge WSW | TS022 |
Steyning WSW | TS008 |
Timsbury WSW | TH004 |
Twyford WSW | TH005 |
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 17 October 2019, which states that there is or has been a significant risk of supplying water from Ground Water Treatment 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 |
---|---|---|
Pathogenic bacteria ingress route and failure of treatment process | E. coli | For example: 43790 |
Pathogenic bacteria ingress route and failure of treatment process | Enterococci | For example: 43791 |
Pathogenic Protozoa breakthrough presenting risk to public health | For Example: Cryptosporidium | For example: 43786 |
Increasing nitrate in source waters | Nitrate | For example: 43811 |
Insufficient water supply to downstream consumers | No Supply | For example: 43845, 43846, 43847 |
Failure of treatment poses risk to wholesomeness | Lead | For example: 43822 |
Failure of treatment poses risk to wholesomeness | Hydrocarbons e.g. PAH | For example: 43839 |
Discolouration in downstream network | For example: Manganese, Iron | For example: 43829, 43828 |
Failure of treatment poses risk to wholesomeness | Other chemical public health | For example: 43844 |
Compromised disinfection process | Turbidity | For example: 70083 |
Treatment by-products | Tetrachloromethane | For example: 43832 |
Failure of treatment poses risk to wholesomeness |
Pesticides (e.g. Aldrin) |
For example: 43806 |
Failure of treatment poses risk to wholesomeness | Taste | For example: 43837 |
Failure of treatment poses risk to wholesomeness | Odour | For example: 43838 |
- 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:
- Ensure all water quality related, scheduled operational and maintenance tasks are carried out at the current prescribed schedule.
Date: Ongoing for the duration of this Notice - Ensure that any new risk identified is assessed in accordance with the drinking water safety plan methodology.
Date: Ongoing for the duration of this Notice - Ensure that treatment works start-up protocols are followed when restarting each site.
Date: Ongoing for the duration of this Notice - Ensure that the existing site-specific disinfection policies are annually reviewed and kept up to date with existing alarm and shutdown levels.
Date: Ongoing for the duration of this Notice - Ensure the treatment works control and shutdown systems are operational and that all monitors are calibrated at the predefined frequencies.
Date: Ongoing for the duration of this Notice - Continue to track borehole headworks condition and risk via the borehole headworks database and drinking water safety plan.
Date: Ongoing for the duration of this Notice - Use site specific procedures where appropriate, including manual intervention or run to waste.
Date: Ongoing for the duration of this Notice - Issue advice to consumers, where required, of improperly disinfected water.
Date: Ongoing for the duration of this Notice - Provide bi-monthly updates at transformation meetings on progress of actions to include predicted float, actions completed to date and any major changes in delivery.
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:
- Carry out mitigation of regulatory risk statements as identified in Appendices:
a) Completion and commissioning of the actions in Appendix A– Phase 1 2026.
Date: 30 June 2026
b) Completion and commissioning of the actions in Appendix B – Phase 2 2026.
Date: 31 December 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: 31 August 2025 - 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 Groundwater 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. - Provide a report confirming completion and commissioning of all Phase 1 2026 actions.
Date: 31 July 2026 - Provide a report confirming completion and commissioning of all Phase 2 2026 actions.
Date: 31 January 2027 - Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
Date: 30 September 2025 - 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: 31 January 2028
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
Nick Adjei
Deputy Chief Inspector, on behalf of the Secretary of State for Environment, Food and Rural Affairs
31 July 2025
Reference: SRN-2025-00008 v1
Appendix A – Phase 1 2026
Unique ID | Site | Step Details | Complete and Commissioning Date |
---|---|---|---|
SW0017-1 |
Angmering WSW |
Angmering WSW – UV bypass |
31-Dec-25 |
SW0017-2 |
Angmering WSW |
Angmering WSW – UV bypass |
31-Dec-25 |
SE0153 |
Southover WSW |
Southover WSW – PLC Replacement |
04-Jan-26 |
KT0162-1 |
Sparrow Castle WSW |
Sparrow Castle WSW – Headworks |
04-Jan-26 |
SN0053 |
Rotherfield WSW |
Rotherfield WSW – Obsolete PLC |
31-Jan-26 |
SE0008 |
Balsdean WSW |
Balsdean WSW Dead Legs |
31-Jan-26 |
SE-Fal007 |
Falmer WSW |
Falmer WSW – GAC deadleg |
31-Jan-26 |
SN-STY-001 |
Steyning WSW |
Steyning – Well 1, ingress risk |
31-Jan-26 |
KM0027 |
Bottom Pond WSW |
Bottom Pond WSW – Compliance sample tap |
31-Jan-26 |
HS0054 |
Easton WSW |
Easton WSW – BH1 panel |
28-Feb-26 |
HS0054-b |
Easton WSW |
Easton WSW – Old Well and BH1 panel |
28-Feb-26 |
SW_FIN001 |
Findon Road WSW |
Findon Road WSW – Site PLC |
28-Feb-26 |
KT0014 |
Fleming WSW |
Fleming WSW – Run to waste |
28-Feb-26 |
KT0014-1 |
Fleming WSW |
Fleming WSW – Run to waste |
28-Feb-26 |
KM0070 |
Higham WSW |
Higham WSW – Obsolete chlorination system |
28-Feb-26 |
KM-NOR001 |
Northfleet WSW |
Northfleet WSW – Final sampling |
31-Mar-26 |
HN0074 |
Overton WSW |
Overton WSW – Borehole condition |
31-Mar-26 |
SN0059 |
Steyning WSW |
Steyning WSW – BH turbidity |
31-Mar-26 |
KM-LBC003 |
Lower Bush Cuxton WSW |
Lower Bush Cuxton WSW – Borehole Headworks conditions |
31-May-26 |
IW0131 |
Calbourne WSW |
Calbourne WSW – Well headworks condition |
03-Jun-26 |
SW0040 |
Clapham WSW |
Clapham WSW – run to waste |
30-Jun-26 |
SE0088-1 |
Newmarket Lewes B WSW |
Newmarket Lewes B WSW – Borehole B |
30-Jun-26 |
SE0088-2 |
Newmarket Lewes B |
Newmarket Lewes B – Borehole B |
30-Jun-26 |
KM0127-1 |
Northfleet WSW |
Northfleet WSW – (Chalk) Borehole 1 |
30-Jun-26 |
SW0064-2 |
Stanhope Lodge WSW |
Stanhope Lodge WSW – Start-up turbidity |
30-Jun-26 |
SW0064-3 |
Stanhope Lodge WSW |
Stanhope Lodge WSW – Start-up turbidity |
30-Jun-26 |
SN0051 |
Rotherfield WSW |
Rotherfield WSW – Flooded chamber |
30-Jun-26 |
Appendix B – Phase 2 2026
Unique ID |
Site |
Step Details |
Complete and Commissioning Date |
---|---|---|---|
KT0162-2 |
Sparrow Castle WSW |
Sparrow Castle WSW – Headworks |
04-Jul-26 |
KM0299 |
Bush Road Cuxton WSW |
Bush Road Cuxton WSW – BH sanitary seal |
31-Jul-26 |
HN0025-3 |
Overton WSW |
Overton WSW – Run to Waste |
05-Aug-26 |
KM0043 |
Bush Road Cuxton WSW |
Bush Road Cuxton WSW – No Run to Waste |
05-Sep-26 |
SE0203 |
Newmarket Lewes C WSW |
Newmarket Lewes C WSW – Ortho dosing |
30-Sep-26 |
IW0167-1 |
Calbourne WSW |
Calbourne WSW – On site hydrocarbons |
30-Sep-26 |
HS0134 |
Easton WSW |
Easton WSW – BH1 and BH2 tests |
30-Sep-26 |
SW-PTG001-2 |
Patching WSW |
Patching WSW – BH3 sanitary seal |
30-Sep-26 |
KT0150 |
Selling WSW |
Selling WSW – Run to Waste |
30-Sep-26 |
KT0150-1 |
Selling WSW |
Selling WSW – Run to Waste |
30-Sep-26 |
SE0161 |
Southover WSW |
Southover WSW – Lewes Valley Radio Network |
30-Sep-26 |
HS0077 |
Twyford WSW |
Twyford WSW – Well 1&2 new floor plates |
30-Sep-26 |
SE0016c |
Falmer WSW |
Falmer WSW – GAC regeneration and return to service |
30-Sep-26 |
SE0202-1 |
Newmarket C&D WSW |
Newmarket C&D WSW – Newmarket C boreholes |
30-Sep-26 |
SE0202-2 |
Newmarket C&D WSW |
Newmarket C&D WSW – Newmarket C boreholes |
30-Sep-26 |
HN0081 |
Ibthorpe WSW |
Ibthorpe WSW – Contact main air release valves |
30-Sep-26 |
HN0015-2 |
Ibthorpe WSW |
Ibthorpe WSW – DO Constraint |
30-Sep-26 |
KT0013-2 |
Flemings WSW |
Flemings WSW – Contact main sediments |
30-Sep-26 |
KT0013-3 |
Flemings WSW |
Flemings WSW – Contact main sediments |
30-Sep-26 |
HS0061 |
Timsbury WSW |
Timsbury WSW- No Run- to- Waste |
30-Sep-26 |
KM0127 |
Northfleet WSW |
Northfleet WSW – (Chalk) Borehole 2 |
30-Sep-26 |
HS0056-3 |
Easton WSW |
Easton WSW – Diesel tank bund |
31-Oct-26 |
IW0123 |
Knighton WSW |
Knighton WSW – Bisulphite tanks |
31-Oct-26 |
KT0030-2 |
Martin Mill WSW |
Martin Mill WSW – Weir Arrangement |
31-Oct-26 |
KT0030-1 |
Martin Mill WSW |
Martin Mill WSW – Weir Arrangement |
31-Oct-26 |
KT0030-3 |
Martin Mills WSW |
Martin Mills WSW – Contact Tank Bypass |
31-Oct-26 |
KT-MaMi001 |
Martin Mill WSW |
Martin Mill WSW – Contact Tank Bypass |
31-Oct-26 |
KT0027 |
Martin Mill WSW |
Martin Mill WSW – No Run to Waste |
31-Oct-26 |
HN0001-1 |
River Way Andover WSW |
River Way Andover WSW – GAC control and operation |
30-Nov-26 |
HN0001-3 |
River Way Andover WSW |
River Way Andover WSW – GAC control and operation |
30-Nov-26 |
SENew014 |
Southover SWS |
Southover SWS – Final RTW |
30-Nov-26 |
IW0025 |
Calbourne WSW |
Calbourne WSW – No raw run to water |
22-Dec-26 |
KM0273 |
London Road WSW |
London Road WSW – No run to waste |
31-Dec-26 |
SE0155-1 |
Southover WSW |
Southover WSW – Orthophosphoric acid deliver |
31-Dec-26 |