An explanatory guidance note ‘Chain of Conformity and Certified Biosolids Guidance Note’ can be accessed here
The current complete Chains of Conformity below, in alphabetical order of treatment organisation, indicate where BAS Members can claim to recycle BAS Certified Biosolids to agricultural land along with a unique identifier.
| Reference Processing Facility | Treatment Type & Product |
Treatment Organisation | Transport & Storage Organisation | Application to Land Organisation | Certified Biosolids (Unique Identifier) |
|---|---|---|---|---|---|
| Afan | Advanced Anaerobic Digestion, Cake | Dwr Cymru | Dwr Cymru | Dwr Cymru | BAS019 |
| Basildon | Advanced Anaerobic Digestion, Cake | Anglian Water | Anglian Water | Anglian Water | BAS002 |
| Cambridge | Advanced Anaerobic Digestion, Cake | Anglian Water | Anglian Water | Anglian Water | BAS004 |
| Cardiff | Advanced Anaerobic Digestion, Cake | Dwr Cymru | Dwr Cymru | Dwr Cymru | BAS020 |
| Chelmsford | Anaerobic Digestion, Cake | Anglian Water | Anglian Water | Anglian Water | BAS005 |
| Colchester | Advanced Anaerobic Digestion, Cake | Anglian Water | Anglian Water | Anglian Water | BAS006 |
| Cotton Valley | Advanced Anaerobic Digestion, Cake | Anglian Water | Anglian Water | Anglian Water | BAS007 |
| Daldowie | Thermal Drying, Granules | SMW | ASBL | ASBL | BAS068 |
| Five Fords | Advanced Anaerobic Digestion, Cake | Dwr Cymru | Dwr Cymru | Dwr Cymru | BAS022 |
| Great Billing | Advanced Anaerobic Digestion, Cake | Anglian Water | Anglian Water | Anglian Water | BAS008 |
| Hatton | Thermal Drying, Granules | Veolia Water Outsourcing | ASBL | ASBL | BAS149 |
| Kings Lynn | Advanced Anaerobic Digestion, Cake | Anglian Water | Anglian Water | Anglian Water | BAS010 |
| Levenmouth | Thermal Drying, Granules | Celts | ASBL | ASBL | BAS018 |
| Lossiemouth | Thermal Drying, Granules | Veolia Water Outsourcing | ASBL | ASBL | BAS150 |
| Lossiemouth | Lime Treatment, Cake | ASBL | ASBL | ASBL | BAS016 |
| March | Lime Treatment, Cake | Anglian Water | Anglian Water | Anglian Water | BAS011 |
| Pyewipe | Advanced Anaerobic Digestion, Cake | Anglian Water | Anglian Water | Anglian Water | BAS012 |
| Wester Jawcraig | Lime Treatment, Cake | ASBL | ASBL | ASBL | BAS017 |
| Whitlingham | Advanced Anaerobic Digestion, Cake | Anglian Water | Anglian Water | Anglian Water | BAS015 |
| Meadowhead | Thermal Drying, Granules | AeSOP's | ASBL | ASBL | BAS001 |
| Hillhouse Farm | Lime Treatment, Cake | Enva Resource Management | Enva Resource Management | Enva Resource Management | BAS025 |
| West Shaws Farm | Lime Treatment, Cake | Enva Resource Management | Enva Resource Management | Enva Resource Management | BAS026 |
| Bran Sands | Advanced Anaerobic Digestion, Cake | Northumbrian Water | Northumbrian Water | Northumbrian Water | BAS027 |
| Howden STW | Advanced Anaerobic Digestion, Cake | Northumbrian Water | Northumbrian Water | Northumbrian Water | BAS028 |
| Cumnock (Underwood) | Anaerobic Digestion, Cake | Scottish Water | Scottish Water | Scottish Water | BAS029 |
| Galashiels | Anaerobic Digestion, Cake | Scottish Water | Scottish Water | Scottish Water | BAS030 |
| Girvan | Lime Treatment, Cake | Scottish Water | Scottish Water | Scottish Water | BAS031 |
| Hawick | Anaerobic Digestion, Liquid | Scottish Water | Scottish Water | Scottish Water | BAS032 |
| Head of Work, Kirkwall | Lime Treatment, Cake | Scottish Water | Scottish Water | Scottish Water | BAS033 |
| Invergordon | Lime Treatment, Cake | Scottish Water | Scottish Water | Scottish Water | BAS034 |
| Kinneil Kerse | Lime Treatment, Cake | Scottish Water | Scottish Water | Scottish Water | BAS035 |
| Perth (Sleepless Inch) WWTP | Lime Treatment, Cake | Scottish Water | Scottish Water | Scottish Water | BAS036 |
| Stornoway WWTW | Lime Treatment, Cake | Scottish Water | Scottish Water | Scottish Water | BAS037 |
| Thurso | Lime Treatment, Cake | Scottish Water | Scottish Water | Scottish Water | BAS038 |
| Troqueer | Lime Treatment, Cake | Scottish Water | Scottish Water | Scottish Water | BAS039 |
| Nigg STW | Advanced Anaerobic Digestion, Cake | Scottish Water Services Grampian | Scottish Water Services Grampian | Scottish Water Services Grampian | BAS040 |
| Hightown Formby Site | Lime Treatment, Cake | SED Services Ltd | SED Services Ltd | SED Services Ltd | BAS041 |
| Alfreton | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS042 |
| Barnhurst/Old Hatton's Farm | Anaerobic Digestion with Lime Addition, Cake | Severn Trent | Severn Trent | Severn Trent | BAS043 |
| Brancote | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS044 |
| Claymills | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS045 |
| Derby | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS046 |
| Finham | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS047 |
| Hayden | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS048 |
| Hinckley | Anaerobic Digestion, Liquid | Severn Trent | Severn Trent | Severn Trent | BAS049 |
| Kidderminster | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS050 |
| Long Eaton - Toton | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS051 |
| Mansfield | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS052 |
| Melton Mowbray | Anaerobic Digestion, Liquid | Severn Trent | Severn Trent | Severn Trent | BAS053 |
| Minworth | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS054 |
| Netheridge | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS055 |
| Newthorpe | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS056 |
| Nuneaton Hartshill | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS057 |
| Redditch (Spernal) | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS058 |
| Roundhill | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS059 |
| Rugby | Anaerobic Digestion, Liquid | Severn Trent | Severn Trent | Severn Trent | BAS060 |
| Rushmoor | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS061 |
| Scunthorpe | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS062 |
| Stoke Bardolph | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS063 |
| Strongford | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS064 |
| Wanlip | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS065 |
| Worcester | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS066 |
| Worksop | Anaerobic Digestion, Cake | Severn Trent | Severn Trent | Severn Trent | BAS067 |
| Ashford (Barnstaple) STC | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS069 |
| Brokenbury (Torbay) STC | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS070 |
| Buckland (Newton Abbot) STC | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS071 |
| Camborne STC | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS072 |
| Camel's Head (Plymouth) STC | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS073 |
| Central (Plymouth) STC | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS074 |
| Cornborough STC | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS075 |
| Countess Wear (Exeter) STC | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS076 |
| Countess Wear (Exeter) STC | Anaerobic Digestion, Cake | South West Water | South West Water | South West Water | BAS077 |
| Ernesettle (Plymouth) STC | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS078 |
| Falmouth STC | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS079 |
| Hayle STC | Anaerobic Digestion, Cake | South West Water | South West Water | South West Water | BAS080 |
| Kilmington (Axminster) STC | Anaerobic Digestion, Cake | South West Water | South West Water | South West Water | BAS081 |
| Lords Meadow (Crediton) STC | Anaerobic Digestion, Cake | South West Water | South West Water | South West Water | BAS082 |
| Maer Lane (Exmouth) STC | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS083 |
| Marshmills (Plymouth) STC | Anaerobic Digestion, Cake | South West Water | South West Water | South West Water | BAS084 |
| Menagwins (St Austell) STC | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS085 |
| Nanstallon (Bodmin) STC | Anaerobic Digestion, Cake | South West Water | South West Water | South West Water | BAS086 |
| Newham (Truro) STC | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS087 |
| Newquay | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS088 |
| Par (St Austell) STC | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS089 |
| Radford (Plymouth) STC | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS090 |
| St Leonards (Launceston) STC | Lime Treatment, Cake | South West Water | South West Water | South West Water | BAS091 |
| Tiverton STC | Composting, Cake | South West Water | South West Water | South West Water | BAS092 |
| Totnes STC | Anaerobic Digestion, Cake | South West Water | South West Water | South West Water | BAS093 |
| Ashford STC | Anaerobic Digestion, Cake | Southern Water | Southern Water | Southern Water | BAS094 |
| Aylesford STC | Anaerobic Digestion, Cake | Southern Water | Southern Water | Southern Water | BAS095 |
| Budds Farm STC | Anaerobic Digestion, Cake | Southern Water | Southern Water | Southern Water | BAS096 |
| Canterbury STC | Anaerobic Digestion, Cake | Southern Water | Southern Water | Southern Water | BAS097 |
| East Worthing STC | Anaerobic Digestion, Cake | Southern Water | Southern Water | Southern Water | BAS098 |
| Ford STC | Anaerobic Digestion, Cake | Southern Water | Southern Water | Southern Water | BAS099 |
| Fullerton STC | Anaerobic Digestion, Cake | Southern Water | Southern Water | Southern Water | BAS100 |
| Goddards Green STC | Anaerobic Digestion, Cake | Southern Water | Southern Water | Southern Water | BAS101 |
| Gravesend STC | Anaerobic Digestion, Cake | Southern Water | Southern Water | Southern Water | BAS102 |
| Ham Hill STC | Anaerobic Digestion, Cake | Southern Water | Southern Water | Southern Water | BAS103 |
| Hastings STC | Anaerobic Digestion, Cake | Southern Water | Southern Water | Southern Water | BAS104 |
| Millbrook STC | Anaerobic Digestion, Cake | Southern Water | Southern Water | Southern Water | BAS105 |
| Motney Hill STC | Anaerobic Digestion, Cake | Southern Water | Southern Water | Southern Water | BAS106 |
| Peacehaven STC | Anaerobic Digestion, Cake | Southern Water | Southern Water | Southern Water | BAS107 |
| Queenborough STC | Anaerobic Digestion, Cake | Southern Water | Southern Water | Southern Water | BAS108 |
| Sandown STC | Anaerobic Digestion, Cake | Southern Water | Southern Water | Southern Water | BAS109 |
| Aylesbury | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS110 |
| Banbury | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS111 |
| Basingstoke | Advanced Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS112 |
| Beckton | Advanced Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS113 |
| Beddington | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS114 |
| Bicester | Lime Treatment, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS115 |
| Bishops Stortford | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS116 |
| Bracknell | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS117 |
| Camberley | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS118 |
| Chertsey | Advanced Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS119 |
| Crawley | Advanced Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS120 |
| Crossness | Advanced Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS121 |
| Deephams | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS122 |
| Didcot | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS123 |
| East Hyde | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS124 |
| Fleet | Lime Treatment, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS125 |
| Guildford | Lime Treatment, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS126 |
| Hogsmill | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS127 |
| Longreach | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS128 |
| Maple Lodge | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS129 |
| Mogden/Iver South | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS130 |
| Oxford | Advanced Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS131 |
| Reading | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS132 |
| Riverside | Advanced Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS133 |
| Rye Meads | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS134 |
| Slough | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS135 |
| Swindon | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS136 |
| Wargrave | Anaerobic Digestion, Cake | Thames Water Utilities Ltd | Thames Water Utilities Ltd | Thames Water Utilities Ltd | BAS137 |
| Blackburn WwTW | Anaerobic Digestion, Cake | United Utilities | United Utilities | United Utilities | BAS138 |
| Bromborough WwTW | Anaerobic Digestion, Cake | United Utilities | United Utilities | United Utilities | BAS139 |
| Burnley WwTW | Advanced Anaerobic Digestion, Cake | United Utilities | United Utilities | United Utilities | BAS140 |
| Carlisle WwTW | Lime Treatment, Cake | United Utilities | United Utilities | United Utilities | BAS141 |
| Ellesmere Port WwTW | Anaerobic Digestion, Cake | United Utilities | United Utilities | United Utilities | BAS142 |
| Lancaster WwTW | Anaerobic Digestion, Cake | United Utilities | United Utilities | United Utilities | BAS143 |
| Leigh WwTW | Advanced Anaerobic Digestion, Cake | United Utilities | United Utilities | United Utilities | BAS144 |
| Manchester Bioresource Centre (MBC) | Advanced Anaerobic Digestion, Cake | United Utilities | United Utilities | United Utilities | BAS145 |
| Mersey Valley Sludge Processing Centre (MVSPC) | Anaerobic Digestion, Cake | United Utilities | United Utilities | United Utilities | BAS146 |
| Southport WwTW | Anaerobic Digestion, Cake | United Utilities | United Utilities | United Utilities | BAS147 |
| Stockport WwTW | Anaerobic Digestion, Cake | United Utilities | United Utilities | United Utilities | BAS148 |
| Allanfearn | Anaerobic Digestion, Cake | Veolia Water Outsourcing Ltd | Scottish Water | Scottish Water | BAS151 |
| Seafield WwTW | Advanced Anaerobic Digestion, Cake | Veolia Water Outsourcing Ltd | Veolia Water Outsourcing Ltd | Veolia Water Outsourcing Ltd | BAS152 |
| Avonmouth WRC | Anaerobic Digestion with Lime Addition, Cake | Wessex Water Services Ltd | Wessex Water Services Ltd | Wessex Water Services Ltd | BAS153 |
| Berry Hill BRC | Anaerobic Digestion, Cake | Wessex Water Services Ltd | Wessex Water Services Ltd | Wessex Water Services Ltd | BAS154 |
| Minehead WRC | Lime Treatment, Cake | Wessex Water Services Ltd | Wessex Water Services Ltd | Wessex Water Services Ltd | BAS155 |
| Poole WRC | Anaerobic Digestion, Cake | Wessex Water Services Ltd | Wessex Water Services Ltd | Wessex Water Services Ltd | BAS156 |
| Ratfyn WRC | Lime Treatment, Cake | Wessex Water Services Ltd | Wessex Water Services Ltd | Wessex Water Services Ltd | BAS157 |
| Taunton (Ham) WRC | Anaerobic Digestion, Cake | Wessex Water Services Ltd | Wessex Water Services Ltd | Wessex Water Services Ltd | BAS158 |
| Trowbridge WRC | Advanced Anaerobic Digestion, Cake | Wessex Water Services Ltd | Wessex Water Services Ltd | Wessex Water Services Ltd | BAS159 |
| West Huntspill WRC | Lime Treatment, Cake | Wessex Water Services Ltd | Wessex Water Services Ltd | Wessex Water Services Ltd | BAS160 |
| Yeovil Vale Road BRC | Lime Treatment, Cake | Wessex Water Services Ltd | Wessex Water Services Ltd | Wessex Water Services Ltd | BAS161 |
| Aldwarke | Anaerobic Digestion, Cake | Yorkshire Water | Yorkshire Water | Yorkshire Water | BAS162 |
| Blackburn Meadows | Anaerobic Digestion, Cake | Yorkshire Water | Yorkshire Water | Yorkshire Water | BAS163 |
| Bridlington | Anaerobic Digestion, Cake | Yorkshire Water | Yorkshire Water | Yorkshire Water | BAS164 |
| Calder Vale | Anaerobic Digestion, Cake | Yorkshire Water | Yorkshire Water | Yorkshire Water | BAS165 |
| Esholt | Advanced Anaerobic Digestion, Cake | Yorkshire Water | Yorkshire Water | Yorkshire Water | BAS166 |
| Hull | Anaerobic Digestion with Lime Addition, Cake | Yorkshire Water | Yorkshire Water | Yorkshire Water | BAS167 |
| Knostrop | Anaerobic Digestion with Lime Addition, Cake | Yorkshire Water | Yorkshire Water | Yorkshire Water | BAS168 |
| Lundwood | Anaerobic Digestion, Cake | Yorkshire Water | Yorkshire Water | Yorkshire Water | BAS169 |
| Naburn | Anaerobic Digestion, Cake | Yorkshire Water | Yorkshire Water | Yorkshire Water | BAS170 |
| Old Whittington | Anaerobic Digestion, Cake | Yorkshire Water | Yorkshire Water | Yorkshire Water | BAS171 |
| Sandall | Anaerobic Digestion, Cake | Yorkshire Water | Yorkshire Water | Yorkshire Water | BAS172 |
| Staveley | Anaerobic Digestion, Cake | Yorkshire Water | Yorkshire Water | Yorkshire Water | BAS174 |
| Woodhouse Mill | Anaerobic Digestion, Cake | Yorkshire Water | Yorkshire Water | Yorkshire Water | BAS175 |
| Wood Farm | Lime Treatment, Cake | 4Recycling Ltd | 4Recycling Ltd | 4Recycling Ltd | BAS176 |
| Cliff Quay | Advanced Anaerobic Digestion, Cake | Anglian Water | Anglian Water | Anglian Water | BAS177 |