Chlorination Certificate

A chlorination certificate is issued after a chlorination has been carried out on a new pipe work/tank/pump/plumbing used to supply drinking water.  It should clearly describe the disinfection process used and the British Standard followed.

Disinfection by chlorination - the process

• Flush pipe work, measuring and recording chlorine level present in supply water
• Introduce chlorine solution to provide chlorine residual of 50mg/l throughout pipe work
• Allow chlorine solution to contact with pipe work for minimum of one hour
• Test chlorine level at end of the hour to ensure that level is within acceptable limits
• Flush chlorinated water to waste until chlorine level returns to level recorded in first stage, ensuring it is dechlorinated as necessary
• If collecting microbiological samples, allow to sit for 30 minutes prior to sample collection
• Test chlorine residuals, turbidity and taste and odour.  Collect UKAS microbiology samples.

Low bromate sodium hypochlorite (liquid chlorine) is used for the disinfection process.  This is the same product as used by water companies to disinfect public water supplies and is approved for use in contact with drinking water.

If no sample is required the chlorination certificate can be issued on the day of the chlorination.  If a microbiological sample was collected the certificate would be issued after 2-5 days - the time taken to analyse the water.

We can often attend site at short notice to provide chlorination services - please contact us to see if we can help.

The chlorination service is similar for building services such as water tanks but it should be noted that the water tank may need to be cleaned prior to chlorination.

Chlorination price

Contact The Water Scientists for a fast competitive quote today!

Our operatives hold in-date EUSR National Water Hygiene Cards and are WIAPS registered.  Membership numbers are quoted on our certification.

Water company chlorination requirements

• Anglian Water chlorination guidance   https://www.anglianwater.co.uk/siteassets/developer/disinfection_pressure_testing1.pdf
• Bournemouth Water chlorination guidance http://www.bournemouthwater.co.uk/uploads/docs/developers/bw_new_connections_info_book.pdf
• Bristol Water chlorination guidance  https://www.bristolwater.co.uk/wp-content/uploads/2019/01/New-Supplies-LeafletV13.pdf
• Portsmouth Water chlorination guidance  https://www.portsmouthwater.co.uk/wp-content/uploads/2015/02/FC8E9D4D-3225-4866-8334-A2C53C58061B.pdf
• Severn Trent Water chlorination guidance https://www.stwater.co.uk/content/dam/stw/stw_buildinganddeveloping/LDC-Guidance-Notes.pdf
• South West Water chlorination guidance https://www.southwestwater.co.uk/siteassets/documents/dev-services/new-water-conns/disinfection-guidance---sww-requirements.pdf
• Southern Water chlorination guidance   https://www.southernwater.co.uk/Media/Default/PDFs/site-managers-guide.pdf
• Thames Water chlorination guidance  https://developers.thameswater.co.uk/-/media/Site-Content/Developer-Services/Chlorination-Requirements.pdf
• Welsh Water chlorination guidance  http://www.dwrcymru.com/en/Forms/Terms-and-Conditions-for-a-Water-Connection.aspx
• Wessex Water chlorination guidance  https://www.wessexwater.co.uk/Developers/Supply/Self-lay-water-mains/
• Yorkshire Water chlorination guidance  https://www.yorkshirewater.com/sites/default/files/Chlorination%20Guidance.pdf

Locations covered;

England

Bedfordshire, Berkshire, Bristol, Buckinghamshire, Cambridgeshire, Cheshire, City of London, Cornwall, Cumbria, Derbyshire, Devon, Dorset, County Durham, East Riding of Yorkshire, East Sussex, Essex, Gloucestershire, Greater London, Greater Manchester, Hampshire, Herefordshire, Hertfordshire, Isle of Wight, Kent, Lancashire, Leicestershire, Lincolnshire, Merseyside, Norfolk, North Yorkshire, Northamptonshire, Northumberland, Nottinghamshire, Oxfordshire, Rutland, Shropshire, Somerset, South Yorkshire, Staffordshire, Suffolk, Surrey, Tyne and Wear, Warwickshire, West Midlands, West Sussex, West Yorkshire, Wiltshire, Worcestershire, Bath, Birmingham, Bradford, Brighton & Hove, Bristol, Carlisle, Cambridge, Canterbury, Chester, Chichester, Coventry, Derby, Durham, Ely, Exeter, Gloucester, Hereford, Kingston-upon-Hull, Lancaster, Leeds, Leicester, Lichfield, Lincoln, Liverpool, London, Manchester, Newcastle-upon-Tyne, Norwich, Nottingham, Oxford, Peterborough, Plymouth, Portsmouth, Preston, Ripon, Salford, Salisbury, Sheffield, Southampton, St Albans, Stoke-on-Trent, Sunderland, Truro, Wakefield, Wells, Westminster, Winchester, Wolverhampton, Worcester and York.

Wales

Blaenau Gwent, Bridgend, Caerphilly, Cardiff, Carmarthenshire, Ceredigion, Conwy, Denbighshire, Flintshire, Gwynedd, Isle of Anglesey, Merthyr Tydfil, Monmouthshire, Neath Port Talbot, Newport, Pembrokeshire, Powys, Rhondda Cynon Taff, Swansea, Torfaen, Vale of Glamorgan, Wrexham, Bangor, Cardiff, Newport, St Davids and Swansea.

Scotland

Ayrshire, Dumfries and Galloway, Edinburgh and The Lothians, Glasgow and Clyde Valley and The Borders.

London Boroughs

Barking and Dagenham, Barnet, Bexley, Brent, Bromley, Camden, City of London, Croydon, Ealing, Enfield, Greenwich, Hackney, Hammersmith and Fulham, Haringey, Harrow, Havering, Hillingdon, Hounslow, Islington, Kensington and Chelsea, Kingston upon Thames, Lambeth, Lewisham, Merton, Newham, Redbridge, Richmond upon Thames, Southwark, Sutton, Tower Hamlets, Waltham Forest, Wandsworth and Westminster.

Water Companies

Affinity Water, Albion Water, Anglian Water, Bournemouth Water, Bristol Water, Cambridge Water Company, Cholderton and District Water Company, Dee Valley Water, Dŵr Cymru Welsh Water, Essex and Suffolk Water, Hartlepool Water, Northumbrian Water, Portsmouth Water, Severn Trent Water, South East Water, Southern Water, South Staffordshire Water, South West Water, Sutton and East Surrey Water, Thames Water, United Utilities, Wessex Water, Yorkshire Water and Youlgrave Waterworks.