Water Hardness in Cardiff

Wales • 36 postcode districts • 1 towns

Slightly Hard

Average ppm

Minimum ppm

109

Maximum ppm

Postcodes

Water Hardness Across Cardiff

The average water hardness in Cardiff is 68 ppm, classified as slightly hard. Across 36 postcode districts in the Wales region, hardness ranges from 31 ppm to 109 ppm.

Cardiff is served by Welsh Water (Dwr Cymru). With slightly hard water, limescale is unlikely to be a major concern in most homes.

Towns in Cardiff

Town	Avg Hardness	PPM	Level
Cardiff	68 ppm	68 ppm	Slightly Hard

Water Companies in Cardiff

Welsh Water (Dwr Cymru)

Average: 68 ppm (Slightly Hard)

All Postcodes in Cardiff

Postcode	Town	Hardness	PPM	Level
CF39	Porth	109 ppm	109 ppm	Slightly Hard
CF38	Pontypridd	108 ppm	108 ppm	Slightly Hard
CF37	Pontypridd	107 ppm	107 ppm	Slightly Hard
CF36	Porthcawl	106 ppm	106 ppm	Slightly Hard
CF35	Bridgend	105 ppm	105 ppm	Slightly Hard
CF34	Maesteg	104 ppm	104 ppm	Slightly Hard
CF33	Bridgend	103 ppm	103 ppm	Slightly Hard
CF32	Bridgend	102 ppm	102 ppm	Slightly Hard
CF64	Penarth	102 ppm	102 ppm	Slightly Hard
CF31	Bridgend	101 ppm	101 ppm	Slightly Hard
CF63	Barry	101 ppm	101 ppm	Slightly Hard
CF62	Barry	100 ppm	100 ppm	Slightly Hard
CF61	Llantwit Major	99 ppm	99 ppm	Slightly Hard
CF5	Cardiff	74 ppm	74 ppm	Slightly Hard
CF3	Cardiff	72 ppm	72 ppm	Slightly Hard
CF2	Cardiff	71 ppm	71 ppm	Slightly Hard
CF24	Cardiff	71 ppm	71 ppm	Slightly Hard
CF23	Cardiff	70 ppm	70 ppm	Slightly Hard
CF83	Caerphilly	66 ppm	66 ppm	Slightly Hard
CF82	Hengoed	65 ppm	65 ppm	Slightly Hard
CF81	Bargoed	64 ppm	64 ppm	Slightly Hard
CF48	Merthyr Tydfil	40 ppm	40 ppm	Soft
CF15	Cardiff	39 ppm	39 ppm	Soft
CF47	Merthyr Tydfil	39 ppm	39 ppm	Soft
CF14	Cardiff	38 ppm	38 ppm	Soft
CF46	Treharris	38 ppm	38 ppm	Soft
CF45	Mountain Ash	37 ppm	37 ppm	Soft
CF44	Aberdare	36 ppm	36 ppm	Soft
CF11	Cardiff	35 ppm	35 ppm	Soft
CF43	Ferndale	35 ppm	35 ppm	Soft
CF10	Cardiff	34 ppm	34 ppm	Soft
CF42	Treorchy	34 ppm	34 ppm	Soft
CF41	Pentre	33 ppm	33 ppm	Soft
CF40	Tonypandy	32 ppm	32 ppm	Soft
CF72	Pontyclun	32 ppm	32 ppm	Soft
CF71	Cowbridge	31 ppm	31 ppm	Soft

Hard Water Guides

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