Legionella risk assessment by location

The legionella duty applies the same way across England, Scotland, and Wales, but knowing your local water supplier and finding a local assessor matters. Choose your city for area-specific guidance.

Aberdeen

Aberdeen City

Water supplier: Scottish Water

Aberystwyth

Wales

Water supplier: Dŵr Cymru Welsh Water

Aldershot

South East England

Water supplier: South East Water

Andover

South East England

Water supplier: Wessex Water

Ashford

South East England

Water supplier: Southern Water

Aylesbury

South East England

Water supplier: Anglian Water

Ayr

South Ayrshire

Water supplier: Scottish Water

Bangor

Wales

Water supplier: Dŵr Cymru Welsh Water

Barking

Greater London

Water supplier: Thames Water

Barnet

Greater London

Water supplier: Affinity Water

Barnsley

South Yorkshire

Water supplier: Yorkshire Water

Barnstaple

South West England

Water supplier: South West Water

Barrow-in-Furness

Cumbria

Water supplier: United Utilities

Barry

Wales

Water supplier: Dŵr Cymru Welsh Water

Basildon

East of England

Water supplier: Essex & Suffolk Water

Basingstoke

South East England

Water supplier: South East Water

Bath

South West England

Water supplier: Wessex Water

Batley

West Yorkshire

Water supplier: Yorkshire Water

Bedford

East of England

Water supplier: Anglian Water

Berwick-upon-Tweed

North East England

Water supplier: Northumbrian Water

Birkenhead

Merseyside

Water supplier: United Utilities

Birmingham

West Midlands

Water supplier: Severn Trent Water

Blackburn

Lancashire

Water supplier: United Utilities

Blackpool

Lancashire

Water supplier: United Utilities

Blyth

North East England

Water supplier: Northumbrian Water

Bognor Regis

South East England

Water supplier: Portsmouth Water

Bolton

Greater Manchester

Water supplier: United Utilities

Boston

East Midlands

Water supplier: Anglian Water

Bournemouth

South West England

Water supplier: Bournemouth Water

Bradford

West Yorkshire

Water supplier: Yorkshire Water

Braintree

East of England

Water supplier: Anglian Water

Brentwood

East of England

Water supplier: Essex & Suffolk Water

Bridgend

Wales

Water supplier: Dŵr Cymru Welsh Water

Bridgwater

South West England

Water supplier: Wessex Water

Bridlington

East Riding of Yorkshire

Water supplier: Yorkshire Water

Brighton

South East England

Water supplier: Southern Water

Bristol

South West England

Water supplier: Bristol Water

Bromley

Greater London

Water supplier: Thames Water

Bromsgrove

Worcestershire

Water supplier: Severn Trent Water

Burnley

Lancashire

Water supplier: United Utilities

Burton upon Trent

Staffordshire

Water supplier: South Staffordshire Water

Bury

Greater Manchester

Water supplier: United Utilities

Bury St Edmunds

East of England

Water supplier: Anglian Water

Caerphilly

Wales

Water supplier: Dŵr Cymru Welsh Water

Cambridge

East of England

Water supplier: Cambridge Water

Cannock

Staffordshire

Water supplier: Severn Trent Water

Canterbury

South East England

Water supplier: Southern Water

Cardiff

Wales

Water supplier: Dŵr Cymru Welsh Water

Carlisle

Cumbria

Water supplier: United Utilities

Carmarthen

Wales

Water supplier: Dŵr Cymru Welsh Water

Chatham

Kent

Water supplier: Southern Water

Chelmsford

East of England

Water supplier: Essex & Suffolk Water

Cheltenham

South West England

Water supplier: Wessex Water

Chester

Cheshire

Water supplier: United Utilities

Chester-le-Street

North East England

Water supplier: Northumbrian Water

Chesterfield

East Midlands

Water supplier: Severn Trent Water

Chichester

South East England

Water supplier: Portsmouth Water

Clacton-on-Sea

East of England

Water supplier: Affinity Water

Coalville

East Midlands

Water supplier: Severn Trent Water

Coatbridge

North Lanarkshire

Water supplier: Scottish Water

Colchester

East of England

Water supplier: Essex & Suffolk Water

Corby

East Midlands

Water supplier: Anglian Water

Coventry

West Midlands

Water supplier: Severn Trent Water

Cramlington

North East England

Water supplier: Northumbrian Water

Crawley

South East England

Water supplier: Southern Water

Crewe

Cheshire

Water supplier: United Utilities

Croydon

Greater London

Water supplier: Thames Water

Cwmbran

Wales

Water supplier: Dŵr Cymru Welsh Water

Darlington

North East England

Water supplier: Northumbrian Water

Dartford

Kent

Water supplier: Thames Water

Derby

East Midlands

Water supplier: Severn Trent Water

Dewsbury

West Yorkshire

Water supplier: Yorkshire Water

Doncaster

South Yorkshire

Water supplier: Yorkshire Water

Dover

South East England

Water supplier: Southern Water

Dudley

West Midlands

Water supplier: Severn Trent Water

Dumfries

Dumfries and Galloway

Water supplier: Scottish Water

Dundee

Dundee City

Water supplier: Scottish Water

Dunfermline

Fife

Water supplier: Scottish Water

Durham

North East England

Water supplier: Northumbrian Water

Ealing

Greater London

Water supplier: Thames Water

East Kilbride

South Lanarkshire

Water supplier: Scottish Water

Eastbourne

South East England

Water supplier: South East Water

Edinburgh

Scotland

Water supplier: Scottish Water

Ely

East of England

Water supplier: Anglian Water

Enfield

Greater London

Water supplier: Thames Water

Exeter

South West England

Water supplier: South West Water

Falkirk

Falkirk

Water supplier: Scottish Water

Fareham

South East England

Water supplier: Portsmouth Water

Farnborough

South East England

Water supplier: South East Water

Flint

Wales

Water supplier: Dŵr Cymru Welsh Water

Folkestone

South East England

Water supplier: Southern Water

Gateshead

North East England

Water supplier: Northumbrian Water

Gillingham

Kent

Water supplier: Southern Water

Glasgow

Scotland

Water supplier: Scottish Water

Glenrothes

Fife

Water supplier: Scottish Water

Gloucester

South West England

Water supplier: Wessex Water

Goole

East Riding of Yorkshire

Water supplier: Yorkshire Water

Gosport

South East England

Water supplier: Portsmouth Water

Grantham

East Midlands

Water supplier: Severn Trent Water

Gravesend

Kent

Water supplier: Thames Water

Grays

East of England

Water supplier: Essex & Suffolk Water

Great Yarmouth

East of England

Water supplier: Essex & Suffolk Water

Greenock

Inverclyde

Water supplier: Scottish Water

Grimsby

North East Lincolnshire

Water supplier: Anglian Water

Guildford

South East England

Water supplier: Thames Water

Halifax

West Yorkshire

Water supplier: Yorkshire Water

Hamilton

South Lanarkshire

Water supplier: Scottish Water

Harlow

East of England

Water supplier: Affinity Water

Harrogate

North Yorkshire

Water supplier: Yorkshire Water

Harrow

Greater London

Water supplier: Affinity Water

Hartlepool

North East England

Water supplier: Northumbrian Water

Hastings

South East England

Water supplier: Southern Water

Havant

South East England

Water supplier: Portsmouth Water

Hemel Hempstead

East of England

Water supplier: Affinity Water

Hereford

Herefordshire

Water supplier: Dŵr Cymru Welsh Water

Hexham

North East England

Water supplier: Northumbrian Water

High Wycombe

South East England

Water supplier: Thames Water

Hinckley

East Midlands

Water supplier: Severn Trent Water

Hounslow

Greater London

Water supplier: Thames Water

Huddersfield

West Yorkshire

Water supplier: Yorkshire Water

Hull

East Riding of Yorkshire

Water supplier: Yorkshire Water

Huntingdon

East of England

Water supplier: Anglian Water

Ilford

Greater London

Water supplier: Thames Water

Ilkeston

East Midlands

Water supplier: Severn Trent Water

Inverness

Highland

Water supplier: Scottish Water

Ipswich

East of England

Water supplier: Anglian Water

Keighley

West Yorkshire

Water supplier: Yorkshire Water

Kettering

East Midlands

Water supplier: Anglian Water

Kidderminster

Worcestershire

Water supplier: Severn Trent Water

Kilmarnock

East Ayrshire

Water supplier: Scottish Water

King's Lynn

East of England

Water supplier: Anglian Water

Kingston upon Thames

Greater London

Water supplier: Thames Water

Kirkcaldy

Fife

Water supplier: Scottish Water

Lancaster

Lancashire

Water supplier: United Utilities

Leeds

West Yorkshire

Water supplier: Yorkshire Water

Leicester

East Midlands

Water supplier: Severn Trent Water

Lincoln

East Midlands

Water supplier: Anglian Water

Liverpool

Merseyside

Water supplier: United Utilities

Livingston

West Lothian

Water supplier: Scottish Water

Llanelli

Wales

Water supplier: Dŵr Cymru Welsh Water

London

Greater London

Water supplier: Thames Water

Long Eaton

East Midlands

Water supplier: Severn Trent Water

Loughborough

East Midlands

Water supplier: Severn Trent Water

Lowestoft

East of England

Water supplier: Essex & Suffolk Water

Luton

East of England

Water supplier: Affinity Water

Macclesfield

Cheshire

Water supplier: United Utilities

Maidstone

South East England

Water supplier: South East Water

Manchester

Greater Manchester

Water supplier: United Utilities

Mansfield

East Midlands

Water supplier: Severn Trent Water

Margate

South East England

Water supplier: Southern Water

Melton Mowbray

East Midlands

Water supplier: Severn Trent Water

Merthyr Tydfil

Wales

Water supplier: Dŵr Cymru Welsh Water

Middlesbrough

North Yorkshire

Water supplier: Northumbrian Water

Milton Keynes

South East England

Water supplier: Anglian Water

Morpeth

North East England

Water supplier: Northumbrian Water

Motherwell

North Lanarkshire

Water supplier: Scottish Water

Neath

Wales

Water supplier: Dŵr Cymru Welsh Water

Newark-on-Trent

East Midlands

Water supplier: Severn Trent Water

Newcastle upon Tyne

North East England

Water supplier: Northumbrian Water

Newport

Wales

Water supplier: Dŵr Cymru Welsh Water

Newton Abbot

South West England

Water supplier: South West Water

Northampton

East Midlands

Water supplier: Anglian Water

Norwich

East of England

Water supplier: Anglian Water

Nottingham

East Midlands

Water supplier: Severn Trent Water

Nuneaton

Warwickshire

Water supplier: Severn Trent Water

Oban

Argyll and Bute

Water supplier: Scottish Water

Oldham

Greater Manchester

Water supplier: United Utilities

Oxford

South East England

Water supplier: Thames Water

Paisley

Renfrewshire

Water supplier: Scottish Water

Perth

Perth and Kinross

Water supplier: Scottish Water

Peterborough

East of England

Water supplier: Anglian Water

Plymouth

South West England

Water supplier: South West Water

Pontypridd

Wales

Water supplier: Dŵr Cymru Welsh Water

Poole

South West England

Water supplier: Bournemouth Water

Port Talbot

Wales

Water supplier: Dŵr Cymru Welsh Water

Portsmouth

South East England

Water supplier: Portsmouth Water

Preston

Lancashire

Water supplier: United Utilities

Ramsgate

South East England

Water supplier: Southern Water

Reading

South East England

Water supplier: Thames Water

Redditch

Worcestershire

Water supplier: Severn Trent Water

Rhyl

Wales

Water supplier: Dŵr Cymru Welsh Water

Richmond upon Thames

Greater London

Water supplier: Thames Water

Rochdale

Greater Manchester

Water supplier: United Utilities

Romford

Greater London

Water supplier: Thames Water

Rotherham

South Yorkshire

Water supplier: Yorkshire Water

Rugby

Warwickshire

Water supplier: Severn Trent Water

Ryde

South East England

Water supplier: Southern Water

Salford

Greater Manchester

Water supplier: United Utilities

Salisbury

South West England

Water supplier: Wessex Water

Scarborough

North Yorkshire

Water supplier: Yorkshire Water

Scunthorpe

North Lincolnshire

Water supplier: Anglian Water

Selby

North Yorkshire

Water supplier: Yorkshire Water

Sheffield

South Yorkshire

Water supplier: Yorkshire Water

Shrewsbury

Shropshire

Water supplier: Severn Trent Water

Slough

South East England

Water supplier: Thames Water

Solihull

West Midlands

Water supplier: Severn Trent Water

South Shields

North East England

Water supplier: Northumbrian Water

Southampton

South East England

Water supplier: Southern Water

Southend-on-Sea

East of England

Water supplier: Essex & Suffolk Water

Southport

Merseyside

Water supplier: United Utilities

Southsea

South East England

Water supplier: Portsmouth Water

St Albans

East of England

Water supplier: Affinity Water

St Helens

Merseyside

Water supplier: United Utilities

Stafford

Staffordshire

Water supplier: Severn Trent Water

Stevenage

East of England

Water supplier: Affinity Water

Stirling

Stirling

Water supplier: Scottish Water

Stockport

Greater Manchester

Water supplier: United Utilities

Stockton-on-Tees

North East England

Water supplier: Northumbrian Water

Stoke-on-Trent

Staffordshire

Water supplier: Severn Trent Water

Stratford-upon-Avon

Warwickshire

Water supplier: Severn Trent Water

Sudbury

East of England

Water supplier: Anglian Water

Sunderland

North East England

Water supplier: Northumbrian Water

Sutton

Greater London

Water supplier: SES Water

Sutton Coldfield

West Midlands

Water supplier: Severn Trent Water

Swansea

Wales

Water supplier: Dŵr Cymru Welsh Water

Swindon

South West England

Water supplier: Wessex Water

Tamworth

Staffordshire

Water supplier: Severn Trent Water

Taunton

South West England

Water supplier: Wessex Water

Telford

Shropshire

Water supplier: Severn Trent Water

Torquay

South West England

Water supplier: South West Water

Trowbridge

South West England

Water supplier: Wessex Water

Truro

South West England

Water supplier: South West Water

Tunbridge Wells

South East England

Water supplier: South East Water

Twickenham

Greater London

Water supplier: Thames Water

Tynemouth

North East England

Water supplier: Northumbrian Water

Uxbridge

Greater London

Water supplier: Affinity Water

Wakefield

West Yorkshire

Water supplier: Yorkshire Water

Wallasey

Merseyside

Water supplier: United Utilities

Walsall

West Midlands

Water supplier: Severn Trent Water

Warrington

Cheshire

Water supplier: United Utilities

Warwick

Warwickshire

Water supplier: Severn Trent Water

Washington

North East England

Water supplier: Northumbrian Water

Waterlooville

South East England

Water supplier: Portsmouth Water

Watford

East of England

Water supplier: Affinity Water

Wellingborough

East Midlands

Water supplier: Anglian Water

Wembley

Greater London

Water supplier: Affinity Water

West Bromwich

West Midlands

Water supplier: Severn Trent Water

Weston-super-Mare

South West England

Water supplier: Wessex Water

Weymouth

South West England

Water supplier: Wessex Water

Wigan

Greater Manchester

Water supplier: United Utilities

Winchester

South East England

Water supplier: South East Water

Wisbech

East of England

Water supplier: Anglian Water

Woking

South East England

Water supplier: Thames Water

Wolverhampton

West Midlands

Water supplier: Severn Trent Water

Worcester

Worcestershire

Water supplier: Severn Trent Water

Worksop

East Midlands

Water supplier: Severn Trent Water

Worthing

South East England

Water supplier: Southern Water

Wrexham

Wales

Water supplier: Dŵr Cymru Welsh Water

Yeovil

South West England

Water supplier: Wessex Water

York

North Yorkshire

Water supplier: Yorkshire Water
Important This page is general guidance only. Legionella risk varies with the specific water system, its use, and the people exposed to it. You should consult a competent legionella risk assessor for advice on your premises. LegionellaCheck is an independent information service and is not affiliated with HSE, UKAS, the Legionella Control Association, or any water hygiene company. This site does not provide medical advice. If you suspect Legionnaires' disease, contact NHS 111 or your GP.