UK Water Companies

Water hardness levels for all 15 UK water suppliers, ranked by average hardness.

#	Water Company	Avg Hardness	PPM	Level	Postcodes
1	Anglian Water	321 ppm	321 ppm	Very Hard	261
2	Thames Water	302 ppm	302 ppm	Very Hard	354
3	South East Water	297 ppm	297 ppm	Hard	17
4	Affinity Water	268 ppm	268 ppm	Hard	33
5	Southern Water	263 ppm	263 ppm	Hard	131
6	Portsmouth Water	261 ppm	261 ppm	Hard	34
7	SES Water	239 ppm	239 ppm	Hard	7
8	Wessex Water	231 ppm	231 ppm	Hard	123
9	Severn Trent Water	221 ppm	221 ppm	Hard	401
10	Yorkshire Water	215 ppm	215 ppm	Hard	218
11	Northumbrian Water	101 ppm	101 ppm	Slightly Hard	122
12	South West Water	80 ppm	80 ppm	Slightly Hard	129
13	United Utilities	77 ppm	77 ppm	Slightly Hard	242
14	Welsh Water (Dwr Cymru)	68 ppm	68 ppm	Slightly Hard	214
15	Scottish Water	54 ppm	54 ppm	Soft	3