UK suppliers

UK Water Companies

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

#	Water Company	Hardness	PPM	Level	Postcodes
1	Anglian Water	321	321 ppm	Very Hard	261
2	Thames Water	302	302 ppm	Very Hard	412
3	South East Water	297	297 ppm	Hard	17
4	Affinity Water	268	268 ppm	Hard	32
5	Southern Water	263	263 ppm	Hard	131
6	Portsmouth Water	261	261 ppm	Hard	34
7	SES Water	239	239 ppm	Hard	7
8	Wessex Water	231	231 ppm	Hard	123
9	Severn Trent Water	222	222 ppm	Hard	345
10	Yorkshire Water	215	215 ppm	Hard	217
11	Northumbrian Water	101	101 ppm	Slightly Hard	122
12	South West Water	80	80 ppm	Slightly Hard	129
13	United Utilities	77	77 ppm	Slightly Hard	242
14	Welsh Water (Dwr Cymru)	68	68 ppm	Slightly Hard	214
15	Scottish Water	54	54 ppm	Soft	3