If you require an accessible version of any of the below Legal Instruments, please contact DWI.Enforcement@defra.gov.uk

If you require an accessible version of any of the below Legal Instruments, please contact DWI_Improvement_Programmes@defra.gov.uk

Affinity Water

Undertakings

Location

Parameter

Completion date

Reference

River Thames works and Ardleigh works 

Metaldehyde and
total pesticides

31/03/2025 (AMP7)

AFW-2019-00002 (V1)

Bulk Imports from Anglian Water, Thames Water and Essex & Suffolk Water 

Metaldehyde and total pesticides

31/03/2025 (AMP7)

AFW-2020-00002 (V1)

North Mymms works 

Metaldehyde and total pesticides

31/03/2025 (AMP7)

AFW-2020-00003 (V1)

Notices

Location

Parameter

Completion date

Reference

Iver treatment works 

Cryptosporidium

31/01/2029

AFW-2020-00005 (V1)

Egham treatment works 

Cryptosporidium

31/01/2029

AFW-2020-00006 (V1)

Anglian Water

Undertakings

Location

Parameter

Completion date

Reference

Surface water catchments

Metaldehyde and total pesticides

31/03/25 (AMP7)

ANH-2019-00002 (V1)

Bulk imports from Essex and Suffolk Water 

Metaldehyde and total pesticides

31/03/2025 (AMP7)

ANH-2020-00005 (V1)

Notices

Location

Parameter

Completion date

Reference

Retford Ordsall works 

Nitrate

31/12/2021 (AMP6)

ANG3328 (V2)

Great Wratting works 

Pesticides

31/11/2022

ANH-2020-00001 (V4)

Little Saxham reservoir 

Nitrate

31/01/2024 (AMP7)

ANG-2018-00001(V2)

Water In Buildings

various parameters

31/10/25 (AMP7)

ANG-2018-00002(V2)

Wighton water treatment works

Nitrate

31/01/2024 (AMP7)

ANG-2018-00003(V2)

Gayton water treatment works 

Nitrate

31/01/2025 (AMP7)

ANG-2018-00004(V2)

Irby (Grimsby) reservoir 

Nitrate

31/01/2024 (AMP7)

ANG-2018-00005 (V2)

Hall water treatment works 

Treatment risks

30/11/2023

ANH-2019-00001 (V3)

Candlesby Taste

Taste

31/05/2022

ANH-2021-00003 (V1)

Mundesley Taste and Odour

Taste and Odour

31/12/2023

ANH-2021-00005 (V1)

Bristol Water

Undertakings

Location

Parameter

Completion date

Reference

Purton & Littleton 

Metaldehyde and total pesticides

31/03/2025 (AMP7)

BRL-2019-00001 (V1)

Notices

Location

Parameter

Completion date

Reference

Cheddar works 

Various

31/01/2026 (AMP7)

BRL-2021-00001 (V1)

Clevedon works 

Cryptosporidium

31/07/2023

BRL4092 (V2)

Alderley treatment works 

Phosphate dosing (lead)

30/04/2024 (AMP7)

BRL-2020-00001 (V1)

Discolouration

Aluminium, Iron, Manganese, Turbidity, Discolouration

30/04/2026

BRL-2021-00003 (V1)

Cambridge Water

Notices

Location

Parameter

Completion date

Reference

Dŵr Cymru Welsh Water

Notices

Location

Parameter

Completion date

Reference

Aberystwyth (Bontgoch/Lovesgrove) zone 

Discolouration

31/10/2027

DWR3529 (V3)

Sketty / Gower zone 

Discolouration

31/10/2027

DWR3512 (V5)

Port Talbot 

Discolouration

31/10/2027

DWR3516 (V3)

Pencoed / Bridgend zone 

Discolouration

31/10/2027

DWR3518 (V3)

Llyswen zone 

Discolouration

31/10/2027

DWR3533 (V3)

Swansea / Morriston zone 

Discolouration

31/10/2022

DWR3513 (V2)

Dafen zone 

Discolouration

31/10/2022

DWR3514 (V2)

Skewen / Llandarcy zone 

Discolouration

31/03/2023

DWR3515 (V4)

Cardiff (Ely / Radyr / Llandaff) zone 

Discolouration

31/10/2027

DWR3521 (V3)

Cardiff (Heath & Llanishen) zone 

Discolouration

31/10/2027

DWR3523 (V3)

Bryngwyn zone 

Discolouration

31/10/2027

DWR3532 (V4)

Hereford Central / North zone 

Discolouration

31/10/2022

DWR3534 (V2)

Abergavenny / Cwmtillery zone 

Discolouration

31/10/2027

DWR3536 (V4)

Maerdy / Porth zone 

Discolouration

31/03/2023

DWR3537 (V4)

Rassau / Sirhowy Valley zone 

Discolouration

31/10/2027

DWR3538 (V3)

Rhymney / Bargoed zone 

Discolouration

31/10/2027

DWR3539 (V2)

Pengarnddu SRV

Potential loss of supply, Turbidity, Iron, Manganese

31/10/2023

DWR-2018-00002 (V2)

Barry/Sully zone 

Discolouration

31/10/2027

DWR-2019-00001 (V2)

Ebbw Vale/Brynmawr zone 

Discolouration

31/10/2027

DWR-2019-00002(V2)

Monmouth/Trellech zone 

Discolouration

31/10/2027

DWR-2019-00003 (V2)

Newport zone 

Discolouration

31/10/2027

DWR-2019-00004 (V2)

Newport West zone 

Discolouration

31/10/2027

DWR-2019-00005 (V2)

Vale of Glamorgan/Rhondda Valleys zone

Discolouration

31/10/2027

DWR-2019-00006 (V3)

Cwm Taff water treatment works 

Taste and odour, raw water deterioration, resilience of supply, regulation 26(4)

31/05/2032

DWR-2018-00001 (V4)

Hafren Dyfrdwy

Notices

Location

Parameter

Completion date

Reference

Legacy and Rhos zones 

Manganese

31/01/2022

HDC-2019-00005 (V2)

Undertakings

Location

Parameter

Completion date

Reference

Pendinas service reservoir

Enterococci

31/08/2025

HDC-2020-0003 (V1)

Icosa Water

Undertakings

Location

Parameter

Completion date

Reference

Bulk imports from South East water and Southern Water 

Metaldehyde

31/03/2025

ICW-2020-00003 (V1)

Independent Water Networks Ltd

Undertakings

Location

Parameter

Completion date

Reference

Bulk imports from Anglian, Northumbrian, South East, southern, Thames, Yorkshire Water 

Metaldehyde

31/03/2025

IWN-2020-00002 (V1)

Isles of Scilly (South West Water Limited) *

* Water supplies on the Isles of Scilly became public supplies on 01 April 2020. South West Water Ltd has the operating licence for these supplies. These improvement programmes represent work being undertaken by South West Water Ltd to secure wholesome public water supplies on the Islands.

Notices

Location

Parameter

Completion date

Reference

Porthellick water treatment works

Radon

31/01/2023

ISC-2021-00001 (V1)

Middletown water treatment works

Radon and Total Indicative Date

30/10/2024

ISC-2021-00002 (V1)

Tommys water treatment works

Chloride

30/09/2024

ISC-2021-00003 (V1)

Plump water treatment works

Chloride

30/09/2024

ISC-2021-00004 (V1)

St Martins Higher Town water treatment works

Manganese, Sodium, Taste, Odour, Chloride, Radon

31/10/2024

ISC-2021-00005 (V1)

Leep Networks Water

Undertakings

Location

Parameter

Completion date

Reference

Bulk supplies from Thames Water, Severn Trent Water, Essex and Suffolk Water, Southern Water and Bristol Water 

Metaldehyde

31/03/2025

LNW-2020-00001 (V1)

Northumbrian, Essex and Suffolk Water

Undertakings

Location

Parameter

Completion date

Reference

Tyneside distribution system

Iron and manganese

30/06/2021

NES2020-00009 (V1)

Surface water catchments 

Metaldehyde and total pesticides

31/03/2025 (AMP7)

NES2020-00005 (V1)

Notices

Location

Parameter

Completion date

Reference

Southend East (ESK) 

Lead

30/04/2021 (AMP6)

ESK3387 (V1)

Rickinghall works

Nickel and Sulphate

30/04/2025

NES-2021-00007 (V1)

Layer Water Treatment Works

Algal and Turbidity loading in raw water

30/04/2025 (AMP7)

ESK-2019-00003 (V2)

Lead strategy 

Lead

30/04/2023 (AMP6)

NNE3279 (V2)

Fontburn Water Treatment Works

Chemical dosing

30/11/2022

NNE3914 (V4)

Murton water treatment works

Turbidity, Disinfection, pH

31/12/2021

NNE3919 (V4)

Fowberry water treatment works 

Turbidity, pH, Disinfections, no supply

30/06/2022

NNE-2018-00001 (V2)

Lartington supply system 

Iron, Manganese, and consumer acceptability

31/01/2027 (AMP7)

NNE-2018-00002 (V1)

Multiple zones 

Manganese, iron and aluminium, Discolouration

TBC (AMP7)

NNE-2018-00003 (V1)

Mosswood water treatment works 

Disinfection

31/12/2023 (AMP7)

NNE-2019-00002 (V1)

Hanningfield works 

Cryptosporidium, disinfection, turbidity

30/06/2021

ESK-2018-00001 (V1)

Fontburn, Stonehaugh, Tosson, Honey Hill, Lartington works 

Disinfection

30/04/2021

NNE-2019-00003 (V1)

Fontburn works

Turbidity

31/04/2022

NNE3617 (V2)

Whittle Dene works 

Cryptosporidium

30/04/2023

NES-2020-00002 (V2)

Mosswood works 

Resilience and power supply

31/05/20206

NES-2020-00006 (V1)

Lumley works 

Cryptosporidium

30/04/2025

NES-2020-00008 (V1)

Tanks and Service Reservoirs

Microbiological Risks

30/04/2026

NES-2020-00011 (V1)

Water Treatment Works Improvement Hazard Review

E. coli, Coliform Bacteria, Turbidity, No Supply, Cryptosporidium

30/04/2026

NES-2021-00002

Portsmouth Water

Notices

Location

Parameter

Completion date

Reference

Maindell works 

Cryptosporidium

TBC

PRT3719 (V3)

Multiple sites 

Hydrocarbons

28/02/2023

PRT-2018-00001 (V3)

All sites 

Catchment risks

31/12/2021

PRT-2020-00002 (V1)

West Street treatment works 

Cryptosporidium

TBC

PRT-2020-00003 (V2)

Walderton treatment works 

Risks to disinfection

TBC

PRT-2020-00004 (V1)

Worlds End treatment works 

Risks to disinfection

TBC

PRT-2020-00005 (V1)

Aldingbourne treatment works 

Risks to disinfection

TBC

PRT-2020-00006 (V1)

West Meon treatment works 

Risks to disinfection

TBC

PRT-2020-00007 (V1)

Slindon treatment works 

Risks to disinfection

TBC

PRT-2020-00008 (V1)

Northbrook treatment works 

Risks to disinfection

TBC

PRT-2020-00009 (V2)

Funtington treatment works 

Risks to disinfection

TBC

PRT-2020-00010 (V2)

SES Water

Undertakings

Location

Parameter

Completion date

Reference

Bough Beech works 

Metaldehyde

31/03/2025 (AMP7)

SES-2019-00001 (V1)

Severn Trent Water

Undertakings

Location

Parameter

Completion date

Reference

Bulk supplies 

Metaldehyde and total pesticides

31/03/2025 (AMP7)

SVT-2020-00002 (V1)

Draycote water treatment works 

Metaldehyde and total pesticides

31/03/2025 (AMP7)

SVT-2019-00006 (V2)

Notices

Location

Parameter

Completion date

Reference

Frankley works 

Cryptosporidium, microbiological, No Supply, and Wholesomeness

31/12/2016

SVT3184 (V3)

Mitcheldean works 

Cryptosporidium

31/10/2021

SVT3439 (V1)

Strensham works

Cryptosporidium, Enterococci and Coliform Bacteria

30/04/2021

SVT3442 (V2)

Peak District water supply zone

Iron, Manganese and Turbidity

28/02/2024

SVT3613 (V5)

Service Reservoir Inspection Improvements

Coliform bacteria; E.coli; C. perfringens; Residual disinfectant (total and free chlorine); Enterococci; Colony counts. 

28/02/2024

SVT-2020-00008 (V1)

Beckbury water treatment works 

CryptosporidiumE.coli and Coliform bacteria

30/04/2025 (AMP7)

SVT-2018-00006 (V1)

Bratch water treatment works 

CryptosporidiumE.coli and Coliform bacteria

31/01/2025 (AMP7)

SVT-2018-00007 (V1)

Brockhill water treatment works 

CryptosporidiumE.coli and Coliform bacteria

31/01/2025 (AMP7)

SVT-2018-00008 (V1)

Budbury water treatment works 

CryptosporidiumE.coli and Coliform bacteria

31/01/2025 (AMP7)

SVT-2018-00009 (V1)

Clipstone water treatment works 

CryptosporidiumE.coli and Coliform bacteria

31/01/2025 (AMP7)

SVT-2018-00010 (V1)

Grindleforge water treatment works 

CryptosporidiumE.coli and Coliform bacteria

31/01/2025 (AMP7)

SVT-2018-00011 (V1)

Oakley Farm water treatment works 

CryptosporidiumE.coli and Coliform bacteria

31/01/2025 (AMP7)

SVT-2018-00012 (V1)

Puleston Bridge water treatment works 

CryptosporidiumE.coli and Coliform bacteria

31/01/2025 (AMP7)

SVT-2018-00013 (V1)

Tack Lane water treatment works 

CryptosporidiumE.coli and Coliform bacteria

31/01/2025 (AMP7)

SVT-2018-00014 (V1)

Epperstone water treatment works

Nitrate

30/04/2025 (AMP7)

SVT-2018-00015 (V2)

Chaddesley Corbett water treatment works 

Selenium

30/04/2025 (AMP7)

SVT-2018-00002 (V1)

Coopers Green water treatment works 

Arsenic

30/04/2026 (AMP7)

SVT-2018-00003 (V1)

Hatton water treatment works 

Taste and Odour

30/04/2026 (AMP7)

SVT-2018-00004 (V2)

Newent water treatment works 

Nitrate

31/03/2026 (AMP7)

SVT-2018-00005(V2)

Plumbosolvency

Lead

31/03/2026

SVT-2019-00007 (V3)

Strensham works 

Disinfection

30/06/2021

SVT-2019-00005 (V1)

Bournheath Service Reservoir Rebuild

Total coliforms and E. coli

30/09/2025

SVT-2021-00003 (V1)

Breamfield Service Reservoir Rebuild

Total Coliforms and E. coli

30/09/2025

SVT-2021-00004 (V1)

South East Water

Undertakings

Location

Parameter

Completion date

Reference

Bulk supplies 

Metaldehyde and total pesticides

31/03/2025 (AMP7)

SEW-2020-00004 (V1)

Catchment 

Metaldehyde and total pesticides

31/03/2025 (AMP7)

SEW-2019-00001 (V1)

Notices

Location

Parameter

Completion date

Reference

Burwash water supply zone 

Iron, Manganese, Turbidity

30/04/2025

SEW3582 (V2)

Cuckfield water supply zone 

Iron, Manganese, Turbidity

30/04/2022

SEW3583 (V3)

Halling water supply zone 

Iron, Manganese, Turbidity

30/04/2023

SEW3598 (V2)

Barcombe Mills treatment works 

Wholesomeness, Compliance with Reg 26, Manganese, Turbidity, Iron, Microbiological Indicators, Cryptosporidium.

28/02/2023

SEW-2018-00004 (V4)

Saddlecombe works 

Compliance with Reg 26, Disinfection – Free, Disinfection – Total, Microbiological.

31/05/2022

SEW-2018-00003 (V2)

Sheet works 

Compliance with Reg 26, Disinfection – Free, Disinfection – Total, Microbiological

31/07/2022

SEW-2018-00005 (V2)

Clayton works 

Compliance with Reg 26, Disinfection – Free, Disinfection – Total, Microbiological

31/07/2022

SEW-2018-00007 (V2)

Ford works 

Compliance with Reg 26, Disinfection – Free, Disinfection – Total, Microbiological

30/07/2022

SEW-2018-00009 (V2)

Godmersham works 

Compliance with Reg 26, Disinfection – Free, Disinfection – Total, Microbiological

30/04/2022

SEW-2018-00010 (V2)

Halling 6 bore New Treated (Greensand) 

Compliance with Reg 26, Disinfection – Free, Disinfection – Total, Microbiological

30/04/2023

SEW-2018-00011 (V2)

Howfield works 

Compliance with Reg 26, Disinfection – Free, Disinfection – Total, Microbiological

30/04/2023

SEW-2018-00012 (V2)

Ospringe 1 works 

Compliance with Reg 26, Disinfection – Free, Disinfection – Total, Microbiological

30/04/2022

SEW-2018-00013 (V2)

Ospringe 2 works 

Compliance with Reg 26, Disinfection – Free, Disinfection – Total, Microbiological

30/04/2023

SEW-2018-00014 (V2)

Woodgarston water treatment works 

Nitrate

31/01/2023

SEW-2018-00015 (V1)

Maidenhead supply system 

Chromium

31/05/2026

SEW-2018-00016 (V1)

Loose service reservoir 

Coliforms, E coli, Clostridia and Enterococci due to the risk of ingress.

22/05/2022

SEW-2020-00003 (V2)

South Staffordshire Water

Undertakings

Location

Parameter

Completion date

Reference

Hampton Loade and Seedy Mill water treatment works 

Metaldehyde

31/03/2025 (AMP7)

SST-2020-00002 (V1)

Notices

Location

Parameter

Completion date

Reference

Hampton Loade works 

Disinfection By-Products, Taste, Odour, and Clostridium perfringens

31/04/2026

SST-2021-00001 (V1)

Seedy Mills works 

Total trihalomethanes, disinfection by-products, and customer acceptability contacts

31/03/2024 (AMP7)

SST-2018-00003 (V1)

Hampton Loade and Seedy Mills distribution network 

Cumster acceptability contacts, and disinfection by-products

30/04/2026 (AMP7)

SST-2018-00004 (V1)

Kinver works 

Nitrate

31/04/2025

SST-2018-00001 (V1)

Slade Heath pumping station 

Pesticide associated product Tetrachloroterephthalic acid (Pesticide – Chlorthal)

30/04/2026

SST-2019-00002 (V1)

South West and Bournemouth Water

Notices

Location

Parameter

Completion date

Reference

Alderney works (Bournemouth) 

Cryptosporidium

31/01/2020

SBW3237 (V2)

Knapp Mill works (Bournemouth) 

Cryptosporidium

31/03/2020

SBW3500 (V3)

Alderney works (Bournemouth) 

Cryptosporidium, Colour, UV transmissity (UVT), Dissolved organic carbon (DOC), Turbidity, Breach of Reg 26

31/12/2025

SBW-2018-00001 (V1)

Knapp Mill works (Bournemouth) 

Cryptosporidium, Colour, UV transmissity (UVT), Dissolved organic carbon (DOC), Turbidity, Breach of Reg 26

31/12/2028

SBW-2018-00002 (V1)

College Water works 

Trihalomethanes, pesticides, taste and odour, manganese and disinfection by-products

28/02/2022 (AMP6)

SWB-2020-00004 (V1)

Crownhill works 

Total coliforms, E.coli,trihalomethanes, pesticides, taste and odour, disinfection by-products and Cryptosporidium

31/12/2021 (AMP6)

SWB-2020-00005(V1)

Restormel water treatment works 

Manganese, Discolouration

30/04/2025 (AMP7)

SWT-2018-00002 (V1)

Multiple zones 

Discolouration

31/12/2025 (AMP7)

SWT-2018-00004 (V1)

St Cleer treatment works 

Manganese, Discolouration

31/01/2025 (AMP7)

SWT-2018-00003 (V1)

Littlehempston water treatment works 

Pesticides, Disinfection by-products, Taste and Odour

30/05/2026 (AMP7)

SWT-2018-00005 (V2)

Stithians water treatment works 

Total trihalomethanes, Taste & Odour, Geosmin, 2-Methylisoborneol

31/01/2024 (AMP7)

SWT-2018-00006 (V1)

Prewley water treatment works and supply system 

Manganese, discoloured water

31/03/2025

SWT-2018-00001 (V1)

Enhanced Tank Cleaning and Inspection 

Microbiological parameters

31/01/2025

SWB-2020-00009 (V1)

Southern Water

Undertakings

Location

Parameter

Completion date

Reference

Beauport, Brede, Burham, Hardham, Testwood and Weir Wood water treatment works 

Metaldehyde

31/03/2025 (AMP7)

SRN-2019-00006 (V1)

Whole company 

Data

30/04/2026

SRN-2019-00008 (V1)

All chlorine booster stations 

Disinfection by-products

31/03/2026

SRN-2019-00003 (V1)

SES Bulk Import 

Metaldehyde

31/03/2025

SRN-2021-00002

Notices

Location

Parameter

Completion date

Reference

Rownhams 01_combined, Rownhams 02, Alvington High Level and Brading Water Supply Zones 

Iron, Manganese and Turbidity

31/01/2032

SRN3924 (V2)

All catchments 

Risk assessments

31/08/2020

SRN3922 (V3)

Otterbourne Water Supply Works and Supply system 

Cryptosporidium, Turbidity, Pathogens/bacteria, Taste &Odour

31/01/2028

SRN3698 (V4)

Testwood Water Supply Works

Cryptosporidium, Breach of Regulation 26 due to coagulation failure, Pathogens/bacteria due to loss of chlorination, Loss of supply, Taste and Odour

31/05/2026

SRN3911 (V6)

All service reservoirs 

Bacteria and parasites, loss of supplies

31/12/2026

SRN3923 (V2)

All groundwater treatment works 

Various parameters

31/03/2026

SRN3926 (V4)

Burham water supply works, Medway supply systems

Pathogenic protozoa, Pathogenic bacteria, pesticides, taste and odour, pH, insufficient water supply

30/04/2026

SRN-2019-00007 (V4)

All treatment works 

Public Health Training and Culture

31/10/2022

SRN3925 (V4)

Borstal water supply zone 

Iron and Turbidity

31/07/2021

SRN-2018-00022 (V1)

Cobham water supply zone 

Iron and Turbidity

31/07/2021

SRN-2018-00023 (V1)

Colewood water supply zone 

Iron and Turbidity

31/07/2021

SRN-2018-00024 (V1)

Darland water supply zone 

Iron and Turbidity

31/07/2021

SRN-2018-00025 (V1)

Wigmore water supply zone 

Iron and Turbidity

31/07/2021

SRN-2018-00026 (V1)

Fairlight water supply zone 

Iron and Turbidity

31/07/2021

SRN-2018-00027 (V1)

Brighton Catchment 

Nitrate

30/04/2026 (AMP7)

SRN-2018-00007 (V1)

Thanet North 

Nitrate

30/04/2026 (AMP7)

SRN-2018-00008 (V1)

Worthing Catchment 

Nitrate

30/04/2026 (AMP7)

SRN-2018-00009 (V1)

Test and Itchen (Groundwater) Catchment 

Nitrate

30/04/2026 (AMP7)

SRN-2018-00010 (V1)

Timsbury water supply works 

Nitrate

31/03/2023 (AMP7)

SRN-2018-00011 (V1)

Twyford water supply works

Nitrate

31/01/2023 (AMP7)

SRN-2018-00012 (V2)

Patching water supply works 

Nitrate

31/01/2025 (AMP7)

SRN-2018-00013 (V2)

North Kent Catchment 

Nitrate

30/04/2026 (AMP7)

SRN-2018-00029 (V1)

Thanet Mid-South Catchment 

Nitrate

30/04/2026 (AMP7)

SRN-2018-00030 (V1)

Patcham water supply works 

Nitrate

30/04/2024 (AMP7)

SRN-2018-00032 (V3)

Brighton water supply works 

Nitrate

31/01/2027 (AMP7)

SRN-2018-00033 (V1)

Hardham water treatment works 

Gross alpha, disinfection, and turbidity

30/04/2026

SRN-2018-00021 (V3)

Sandown Shanklin water supply works

 Clostridium Perfringens, Cryptosporidium, E. coli, Enterococci, Lead, Manganese, No Supply, Pesticides, and Total Coliforms

30/04/2026

SRN-2018-00020 (V3)

Weirwood Forest Row water treatment works 

Pathogenic Bacteria, Parasites, No Supply, Taste and Odour, pH, Pesticides, Chemical (public health hazard)

30/04/2026

SRN-2020-00001 (V2)

Thanet supply system

Nitrate, E Coli, Enterococci, No supply and Turbidity

31/01/2027 (AMP7)

SRN-2020-00003 (V3)

Brede and Beauport water supply works 

Clostridium Perfringens, Cryptosporidium, E.coli, Enterococci, Manganese, Total Coliforms and Turbidity

30/04/2026

SRN-2020-00007 (V1)

Cocking Hill WSR

Iron

30/04/2024

SRN-2020-00006 (V1)

Thames Water

Undertakings

Location

Parameter

Completion date

Reference

Coppermills, Chingford South, Farmoor, Swinford, Fobney, Hornsey, Shalford, Walton Hampton, Ashford and Kempton water treatment works 

Metaldehyde

31/03/2025 (AMP7)

TMS-2019-00002 (V1)

Bulk imports from Grafham, Morcott and Wing water treatment works 

Metaldehyde and total pesticides

30/04/2020 (AMP7)

TMS-2020-00006 (V1)

Notices

Location

Parameter

Completion date

Reference

All catchments 

Cryptosporidium

21/03/2020

TMS3950 (V1)

All sites 

Cryptosporidium

29/02/2024

TMS3952 (V1)

Pann Mill works 

Cryptosporidium

30/04/2021

TMS3957 (V1)

Sheeplands works 

Cryptosporidium

30/06/2022

TMS3958 (V2)

Watlington works 

Cryptosporidium

30/04/2022

TMS3960 (V1)

Epsom works 

Cryptosporidium

30/04/2022

TMS-2018-00003 (V2)

London Slow Sand Filter Works

Regulation 26, Regulation 4, Slow sand filtration, Cryptosporidium

30/04/2022

TMS3966 (V2)

Whole company

Competency and training

01/08/2022

TMS-2020-00004 (V1)

Various sites (listed in Annex1) 

Site contamination (risk from flooding)

01/03/2025

TMS3892 (V2)

Netley Mill works 

Disinfection

31/01/2023

TMS-2019-00003 (V1)

Whole company 

Procedures and documentation

30/04/2024

TMS-2020-00001 (V2)

Whole company 

Risk assessment and resilience

31/05/2022

TMS-2020-00003 (V1)

All treatment works 

Turbidity and disinfection

06/05/2025

TMS3912 (V2)

Chessington service reservoir 

Microbiological parameters

31/08/2022

TMS-2020-00002 (V1)

Farnborough Service Reservoir Chain

Chlorine, Biological and Inorganic Parameters

TMS- 2021-00002 (V1)

TBC

Service Reservoirs, Turnover & Chlorine Residual Risk 

Chlorine, Biological and Inorganic Parameters

TBC

TMS-2021-00004

Interstage Assets Ingress

Cryptosporidium, Biological, Physico-chemical, Metals, Inorganic, E. coli, Total Coliforms, Enterococci, Contamination.

TMS-2021-00003

TBC

United Utilities Water

Undertakings

Location

Parameter

Completion date

Reference

Cumwhinton to Carlisle trunk/distribution mains 

Iron and manganese

31/01/2023

UUT2793 (V2)

All Treatment works and associated supply systems 

Telemetry and alarms – iron, manganese, aluminium and pH

TBC

UUT3246 (V1)

Notices

Location

Parameter

Completion date

Reference

Haweswater large diameter trunk main 

Potential ingress

31/01/2023

UUT3038 (V3)

Franklaw works 

Wholesome water and Crytosporidium

31/10/2021

UUT3499 (V4)

Prenton Lower service reservoir 

Coliform bacteria, E.coli and other pathogens

TBC

UUT3480 (V4)

Brown Edge service reservoirs 1,2 &3; St Helens South & North zones; St Helens supply system 

Coliform bacteria. E Coli and other pathogens

30/09/2021

UUT3476 (V5)

Treated water storage tanks 

E.coli, coliforms, Cryptosporidium, taste and odour

30/06/2023

UUT3563 (V4)

All treatment works 

Cryptosporidium

31/01/2020

UUT3574 (V2)

Consumer acceptability and discolouration

Iron, manganese, aluminium and turbidity

30/04/2031

UUT-2020-00005 (V1)

Hodder water treatment works 

Turbidity, Cryptosporidium

28/02/2024

UUT3692 (V2)

Castle Carrock water treatment works 

Taste and Odour

29/02/2024 (AMP7)

UUT-2018-00003 (V1)

Laneshaw water treatment works 

Taste and Odour

30/10/2023 (AMP7)

UUT-2018-00004 (V1)

Mitchells water treatment works 

Taste and Odour

30/10/2023 (AMP7)

UUT-2018-00005 (V1)

Rivington water treatment works 

Taste and Odour

29/02/2024 (AMP7)

UUT-2018-00006 (V1)

Huntington works 

E. coli, coliform bacteria, turbidiy

31/01/2023

UUT-2019-00003 (V3)

Sweetloves works 

Coliform bacteria, E. coli, turbidity, pH, colour, metals

30/06/2022

UUT3693 (V2)

Concessionary supplies 

Microbiological parameters, metals, colour, turbidity, pH, taste and odour

30/09/2020

UUT3930 (V2)

Watchgate works 

Disinfection, coliform bacteria, E. coli, turbidity

30/06/2023

UUT3948 (V1)

Oswestry treatment works 

Iron, manganese, turbidity, cryptosporidium, taste & odour, E coli, coliforms.

30/08/2025

UUT-2020-00003 (V1)

Prescot North & South Reservoir

Ingress

30/04/2024

UUT-2021-00002 (V1)

Enforcement Orders

Location

Parameter

Completion date

Reference

Final Enforcement Order at Vyrnwy LDTM and Schedule 

Iron, discolouration

31/01/2030

UUT-2020-00002 (V1)

Wessex Water

Notices

Location

Parameter

Completion date

Reference

Sutton Poyntz works 

Turbidity/disinfection

31/01/2022

WSX3495 (V2)

Washpool works 

Turbidity/disinfection

31/01/2022

WSX3496 (V2)

Fonthill Bishop works 

Nitrate

30/04/2025 (AMP7)

WSX-2018-00001 (V1)

Sturminster Marshall / Shipwick works 

Nitrate

30/04/2025 (AMP7)

WSX-2018-00002 (V1)

Consumer Acceptability Discolouration

Aluminium; Iron; Manganese; Turbidity; Discolouration

30/04/2031

WSX-2021-00002 (V1)

Yorkshire Water

Undertakings

Location

Parameter

Completion date

Reference

Various treatment works

Metaldehyde and total pesticides

31/03/2025 (AMP7)

YKS-2019-00002 (V1)

Notices

Location

Parameter

Completion date

Reference

Rivelin works 

Cryptosporidium, trihalomethanes, colour and disinfection by-products

31/01/2019 (AMP6)

YKS3249 (V2)

Chellow Heights works 

Coliform bacteria, E Coli, Turbidity, Cryptosporidium

30/04/2022

YKS3916 (V2)

Tophill Low No 2 water treatment works 

Taste and Odour, and Cryptosporidium

30/06/2025 (AMP7)

YKS-2018-00001 (V3)

Fixby water treatment works 

Disinfection by-products (THMs and HAAs)

31/08/2024 (AMP7)

YKS-2018-00002 (V2)

Oldfield works 

Disinfection by-products (THMs and HAAs)

31/04/2026 (AMP7)

YKS-2018-00003 (V1)

Sladen Valley water treatment works 

Disinfection by-products (THMs and HAAs)

31/05/2024 (AMP7)

YKS-2018-00004 (V1)

Chellow Heights water treatment works 

Disinfection by-products (THMs and HAAs)

30/04/2025 (AMP7)

YKS-2018-00005 (V2)

Embsay water treatment works 

Manganese, Cryptosporidium, Bacteria, Disinfection by-products (THMs and HAAs)

30/10/2024 (AMP7)

YKS-2018-00006 (V1)

Multiple supply zones 

Discolouration

31/01/2024

YKS-2019-00001 (V1)

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