National Hydro-Index30 UK Metropolitan Hubs
UK Water Hardness by City: Complete PPM Directory
Compare average mineral PPM levels, water suppliers, and neighbourhood hydro-variance across the UK's 30 largest cities. Select any city to view local outcode postcodes and Which?-style household advice.
Softest Major City
Glasgow (22 PPM)
Sourced from Loch Katrine (Scottish Water)
Hardest Major City
Norwich (325 PPM)
Deep Norfolk chalk boreholes (Anglian Water)
UK Baseline Benchmark
~200 PPM CaCO3
Threshold between moderate and hard water
Filter by Hardness:
Showing 30 of 30 UK Cities
Hard WaterGreater London
London
278PPM (19.4° Clark)
Thames Water & Affinity Water
Softest:Enfield & Barnet (235 PPM)
Hardest:Wandsworth & Battersea (315 PPM)
View Postcode Breakdown
Soft WaterWest Midlands
Birmingham
48PPM (3.4° Clark)
Severn Trent Water
Softest:Edgbaston & Harborne (38 PPM)
Hardest:Sutton Coldfield (145 PPM)
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Soft WaterNorth West
Manchester
35PPM (2.4° Clark)
United Utilities
Softest:Didsbury & Chorlton (28 PPM)
Hardest:Salford Quays (52 PPM)
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Soft WaterScotland
Glasgow
22PPM (1.5° Clark)
Scottish Water
Softest:West End & Hillhead (18 PPM)
Hardest:Southside & Shawlands (30 PPM)
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Soft WaterNorth West
Liverpool
42PPM (2.9° Clark)
United Utilities
Softest:Allerton & Aigburth (32 PPM)
Hardest:City Centre & Baltic (58 PPM)
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Hard WaterSouth West
Bristol
285PPM (19.9° Clark)
Bristol Water
Softest:Clifton & Redland (240 PPM)
Hardest:Bedminster & Southville (310 PPM)
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Soft WaterScotland
Edinburgh
38PPM (2.7° Clark)
Scottish Water
Softest:Old Town & New Town (26 PPM)
Hardest:Morningside & Bruntsfield (48 PPM)
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Soft WaterYorkshire & The Humber
Leeds
75PPM (5.2° Clark)
Yorkshire Water
Softest:Headingley & Hyde Park (55 PPM)
Hardest:Garforth & Rothwell (130 PPM)
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Soft WaterYorkshire & The Humber
Sheffield
46PPM (3.2° Clark)
Yorkshire Water
Softest:Ecclesall & Broomhill (36 PPM)
Hardest:Darnall & Attercliffe (68 PPM)
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Moderately HardNorth East
Newcastle upon Tyne
125PPM (8.7° Clark)
Northumbrian Water
Softest:Jesmond & Gosforth (95 PPM)
Hardest:Byker & Walker (155 PPM)
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Hard WaterEast Midlands
Nottingham
265PPM (18.5° Clark)
Severn Trent Water
Softest:Wollaton & Beeston (210 PPM)
Hardest:West Bridgford & Rushcliffe (295 PPM)
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Soft WaterWales
Cardiff
72PPM (5° Clark)
Dŵr Cymru Welsh Water
Softest:Roath & Cathays (54 PPM)
Hardest:Cardiff Bay & Butetown (98 PPM)
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Soft WaterNorthern Ireland
Belfast
68PPM (4.8° Clark)
Northern Ireland Water
Softest:Mourne & South Belfast (45 PPM)
Hardest:East Belfast & Castlereagh (92 PPM)
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Hard WaterSouth East
Southampton
295PPM (20.6° Clark)
Southern Water
Softest:Shirley & Millbrook (260 PPM)
Hardest:Bitterne & Portswood (320 PPM)
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Hard WaterEast Midlands
Leicester
245PPM (17.1° Clark)
Severn Trent Water
Softest:Clarendon Park & Knighton (215 PPM)
Hardest:Beaumont Leys & Belgrave (280 PPM)
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Hard WaterWest Midlands
Coventry
275PPM (19.2° Clark)
Severn Trent Water
Softest:Earlsdon & Tile Hill (240 PPM)
Hardest:Stoke & Walsgrave (305 PPM)
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Hard WaterSouth East
Brighton & Hove
285PPM (19.9° Clark)
Southern Water
Softest:Hove & Portslade (255 PPM)
Hardest:Kemptown & Hanover (310 PPM)
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Soft WaterSouth West
Plymouth
34PPM (2.4° Clark)
South West Water
Softest:Peverell & Hartley (25 PPM)
Hardest:The Hoe & Barbican (48 PPM)
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Moderately HardWest Midlands
Stoke-on-Trent
165PPM (11.5° Clark)
Severn Trent Water
Softest:Tunstall & Burslem (135 PPM)
Hardest:Longton & Trentham (195 PPM)
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Moderately HardWest Midlands
Wolverhampton
155PPM (10.8° Clark)
Severn Trent Water
Softest:Tettenhall & Penn (110 PPM)
Hardest:Wednesfield & Bilston (190 PPM)
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Hard WaterEast Midlands
Derby
230PPM (16.1° Clark)
Severn Trent Water
Softest:Allestree & Darley Abbey (185 PPM)
Hardest:Alvaston & Chellaston (260 PPM)
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Soft WaterWales
Swansea
45PPM (3.1° Clark)
Dŵr Cymru Welsh Water
Softest:Mumbles & Gower (32 PPM)
Hardest:Morriston & Llansamlet (62 PPM)
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Soft WaterScotland
Aberdeen
28PPM (2° Clark)
Scottish Water
Softest:Cults & Bieldside (20 PPM)
Hardest:Bridge of Don & Dyce (38 PPM)
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Hard WaterSouth East
Portsmouth
290PPM (20.3° Clark)
Portsmouth Water
Softest:Southsea & Old Portsmouth (265 PPM)
Hardest:Cosham & Drayton (315 PPM)
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Hard WaterYorkshire & The Humber
York
240PPM (16.8° Clark)
Yorkshire Water
Softest:Fulford & Heslington (210 PPM)
Hardest:Clifton & Rawcliffe (270 PPM)
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Hard WaterSouth East
Reading
295PPM (20.6° Clark)
Thames Water
Softest:Caversham & Mapledurham (265 PPM)
Hardest:Tilehurst & Southcote (320 PPM)
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Very Hard WaterEast of England
Norwich
325PPM (22.7° Clark)
Anglian Water
Softest:Eaton & Cringleford (295 PPM)
Hardest:Thorpe St Andrew (355 PPM)
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Very Hard WaterEast of England
Cambridge
315PPM (22° Clark)
Cambridge Water
Softest:Newnham & Girton (285 PPM)
Hardest:Cherry Hinton & Trumpington (345 PPM)
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Hard WaterSouth East
Oxford
290PPM (20.3° Clark)
Thames Water
Softest:Jericho & Summertown (260 PPM)
Hardest:Headington & Cowley (320 PPM)
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Soft WaterSouth West
Exeter
48PPM (3.4° Clark)
South West Water
Softest:St Leonards & Topsham (35 PPM)
Hardest:Pinhoe & Whipton (68 PPM)
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