Yorkshire Water Services Limited – Water Treatment Works Control Systems

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

Reference: YKS-2022-00005

Version Number: 2

Water undertaker as appointed under section 6 of the Water Industry Act 1991 (as amended): Yorkshire Water Services Limited, with registered number 02366682 (hereinafter called ‘the Company’).

Assets Affected:

Water treatment works and downstream zones listed in appendix one

Details of this Notice:

1. The Drinking Water Inspectorate (‘the Inspectorate’) has received a set of regulation 28(1) reports of the Water Supply (Water Quality) Regulations 2016 (as amended) (‘the Regulations’) from the Company dated 21 October 2021 with subsequent risk assessment reports in May 2022, which state that there is or has been a significant risk of supplying water from various 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/Parameter
Failure to control treatment process due to power or PLC failure	Cryptosporidium
Failure to control treatment process due to power or PLC failure	E. coli
Failure to control treatment process due to power or PLC failure	Iron
Failure to control treatment process due to power or PLC failure	Manganese
Failure to control treatment process due to power or PLC failure	Aluminium
Failure to control treatment process due to power or PLC failure	Turbidity

Table 1: Table of the hazards, and/or parameters covered by this Notice, including the description of risks.

3. 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 all WTWs in accordance with current company policy, standards, and procedures aligning recognised standards of good practice.
   Date: Ongoing for the duration of this Notice
2. Continue to maintain a training programme to ensure all Instrumentation, Control and Automation (ICA) staff are competent to resolve issues on works in and out of hours.
   Date: Ongoing for the duration of this Notice
3. Ensure all drinking water ICA staff have access to the correct hardware and software to efficiently complete required tasks.
   Date: Ongoing for the duration of this Notice
4. Continue proactive maintenance programme for Uninterruptable Power Supplies (UPSs) and Programmable Logic Controllers (PLCs) in accordance with manufacturer’s instructions.
   Date: Ongoing for the duration of this Notice
5. Continuously review the power supply testing procedure, frequency of testing and update where required.
   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. Formalise PLC start up procedures for after a power failure for each named works which are to be used prior to and during remedial activity upgrades defined in (b)3
   Date: 31 December 2022
2. Review and update the list of sites requiring improved resilience to electrical interruption, including UPS
   Date: 30 November 2022
3. Confirm the requirements for each site with regards to:
4. Improved resilience to interruption in communication between PLCs
5. Date: 30 November 2022
6. Improved resilience for loss of electrical power
7. Date: 30 November 2022
8. Develop a plan for delivery of remedial activity to address the risk identified in (b)2
   Date: 30 November 2022
9. Implement and complete the programme of works identified in (b)3 and (b)4
   Date: 31 March 2025

(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: 30 November 2022
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 various 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. Submit all formalise PLC start up procedures as per step (b)1
   Date: 31 December 2022
3. Provide a list of sites and associated remedial work action plans to demonstrate completion of steps (b)2, (b)3 and (b)4
   Date: 31 December 2022
4. Upon implementation and completion of remedial activity for a listed works (b)5 submit completion report with evidence of load-bearing testing to demonstrate the benefit and updated Regulation 28(1) report.
   Date: Upon site completion or by 31 March 2026
5. Submit the audit strategy for auditing the effectiveness of the measures, as specified in measure (c)1.
   Date: 31 December 2022
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 March 2026

Further Details of this Notice:

4. Any product or substance used as a result of the requirements in this Notice must comply with regulation 31.
5. 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.
6. 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 September 2022
Reference: YKS-2022-00005

Appendix One

Asset Name	Reference	Associated Zones
Graincliffe WTW	T4692722	Z4800503 Airedale 2004, Z4800619 Bradford City North 2019, Z4800719 Bradford City South 2019, Z4802103 Graincliffe 2004, Z4803103 Keighley 2004
Elvington WTW	T2692940	Z1806419 Pontefract 2019, Z1801319 Leeds Grid 2019, Z1800819 Castleford 2019, Z1801519 Leeds HL Cross Gates and Scholes 2019, Z1802019 Leeds LL Cross Green 2019, Z1801719 Leeds HL Hawksworth and Gledhow 2019, Z1805517 Morley Ossett 2017 Z1807519 Selby 2019, Z1802619 Goole 2019, Z1808019 Wakefield City North 2019, Z1808119 Wakefield City South Sam 2019, Z2801719 Easingwold 2019, Z3800519 Barnsley Grid – Woolley 2019, Z3800419 Barnsley Grid – Wombwell 2019, Z3800619 Aughton 2019, Z3801919 Carcroft 2019, Z3801419 Doncaster – Wadworth 2019, Z3800819 Doncaster – Haxey 2019, Z3801519 Doncaster – Armthorpe 2019, Z3800719 Barnsley Grid – Grimethorpe 2019, Z3807519 Rotherham and Tinsley 2019, Z3804219 Kimberworth 2019, Z3804503 Loxley 2004, Z3805019 Manor 2019, Z3805519 Moonshine 2019, Z3801719 Ewden 2019, Z3806019 Norton Sheffield 2019, Z3800219 Barnsley – Langsett 2019, Z3801319 Rawmarsh and Wickersley 2019, Z3808003 Wath 2004, Z3807319 Sheffield – Grenoside 2019, Z4801917 Dewsbury 2017, Z9809619 York North 2019, Z9809719 York West 2019, Z2804819 Malton 2019
Headingley WTW	T1691802, T1691803	Z1801319 Leeds Grid 2019, Z1801419 Leeds HL Bramley 2019, Z1801819 Leeds HL Headingly 2019, Z1801519 Leeds HL Cross Gates and Scholes 2019, Z1801619 Leeds HL Harewood and Shadewell 2019, Z1802219 Leeds LL Burley and Holbeck 2019, Z1801919 Leeds LL Bramhope and Alwoodley 2019, Z1802019 Leeds LL Cross Green 2019, Z1801719 Leeds HL Hawksworth and Gledhow 2019, Z1802119 Leeds LL Horsforth and Tinshill 2019, Z1801219 Leeds LL Robin Hood 2019
Thornton Steward WTW	T2698150	Z2800819 Catterick and Richmond 2019, Z2805519 Northallerton and Thirsk 2019, Z2809015 Dales 2015
Albert WTW	T4690220	Z1805517 Morley Ossett 2017, Z1808019 Wakefield City North 2019, Z4801503 Brighouse 2004, Z4801917 Dewsbury 2017, Z4802303 Halifax 2004, Z4803133 Roils Head 2004
Embsay WTW	T4692155	Z4803103 Keighley 2004, Z4805015 Skipton/Craven 2015
Ingbirchworth WTW	T3692910	Z3800319 Barnsley – Pennine 2019, Z4802919 Holmfirth and Emley 2019
TopHill Low WTW	T2698270	Z2800519 Beverley 2019, Z2803019 Holderness 2019, Z2804519 Hornsea 2019, Z2807219 Scarborough 2019, Z2807119 Filey 2019, Z2801219 Bridlington 2019, Z2804669 Hull East 2019, Z2804679 Hull Bransholme 2019
Eccup 1 WTW	T1691050	Z1801319 Leeds Grid 2019, Z1800819 Castleford 2019, Z1801419 Leeds HL Bramley 2019, Z1801819 Leeds HL Headingly 2019, Z1801519 Leeds HL Cross Gates and Scholes 2019, Z1801619 Leeds HL Harewood and Shadewell 2019, Z1802219 Leeds LL Burley and Holbeck 2019, Z1801919 Leeds LL Bramhope and Alwoodley 2019, Z1802019 Leeds LL Cross Green 2019, Z1801719 Leeds HL Hawksworth and Gledhow 2019, Z1802119 Leeds LL Horsforth and Tinshill 2019, Z1801219 Leeds LL Robin Hood 2019, Z1807819 Tadcaster and Wetherby 2019, Z2802819 Harrowgate South 2019, Z2802719 Harrowgate North 2019, Z2804319 Knaresborough 2019, Z2806019 Pateley Bridge and Ripon 2019
Keldgate WTW	T2695050	Z2806719 Pickering 2019
Rivelin WTW	T3694100, T38S4100	Z3800619 Aughton 2019, Z3802319 Fulwood 2019, Z3807519 Rotherham and Tinsley 2019, Z3804219 Kimberworth 2019, Z3804503 Loxley 2004, Z3805019 Manor 2019, Z3805519 Moonshine 2019, Z3801719 Ewden 2019, Z3806019 Norton Sheffield 2019, Z3801319 Rawmarsh and Wickersley 2019, Z3807319 Sheffield – Grenoside 2019
Loftsome Bridge WTW	T2690800	Z1806419 Pontefract 2019, Z1801319 Leeds Grid 2019, Z1800819 Castleford 2019, Z1801519 Leeds HL Cross Gates and Scholes 2019, Z1802019 Leeds LL Cross Green 2019, Z1801719 Leeds HL Hawksworth and Gledhow 2019, Z1805517 Morley Ossett 2017, Z1807519 Selby 2019, Z1802619 Goole 2019, Z1808019 Wakefield City North 2019, Z1808119 Wakefield City South Sam 2019, Z2800519 Beverley 2019, Z2803019 Holderness 2019, Z2804519 Hornsea 2019, Z2804659 Hull Central South 2019, Z2804619 Hull Central North 2019, Z2804689 Hull West 2019, Z2804419 Howden 2019, Z2804669 Hull East 2019, Z2804679 Hull Bransholme 2019, Z2804919 Market Weighton 2019 Z3800519 Barnsley Grid – Woolley 2019 Z3800419 Barnsley Grid – Wombwell 2019 Z3800619 Aughton 2019 Z3801919 Carcroft 2019 Z3801419 Doncaster – Wadworth 2019 Z3800819 Doncaster – Haxey 2019 Z3801519 Doncaster – Armthorpe 2019 Z3800719 Barnsley Grid – Grimethorpe 2019 Z3807519 Rotherham and Tinsley 2019 Z3804219 Kimberworth 2019 Z3804503 Loxley 2004 Z3805019 Manor 2019 Z3805519 Moonshine 2019 Z3801719 Ewden 2019 Z3806019 Norton Sheffield 2019 Z3800219 Barnsley – Langsett 2019 Z3801319 Rawmarsh and Wickersley 2019 Z3808003 Wath 2004 Z3807319 Sheffield – Grenoside 2019 Z4801917 Dewsbury 2017
Huby WTW	T2692680	Z2801719 Easingwold 2019
Ruswarp WTW	T2693100	Z2803003 Esk Valley 2004

Table 2: List of assets affected and associated reference numbers