Water Hardness in Cardiff
Wales • 36 postcode districts • 1 towns
Slightly Hard
68
Average ppm
31
Minimum ppm
109
Maximum ppm
36
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 | Slightly Hard |
Water Companies in Cardiff
All Postcodes in Cardiff
| Postcode | Town | Hardness | PPM | Level |
|---|---|---|---|---|
| CF39 | Porth | 109 ppm | Slightly Hard | |
| CF38 | Pontypridd | 108 ppm | Slightly Hard | |
| CF37 | Pontypridd | 107 ppm | Slightly Hard | |
| CF36 | Porthcawl | 106 ppm | Slightly Hard | |
| CF35 | Bridgend | 105 ppm | Slightly Hard | |
| CF34 | Maesteg | 104 ppm | Slightly Hard | |
| CF33 | Bridgend | 103 ppm | Slightly Hard | |
| CF32 | Bridgend | 102 ppm | Slightly Hard | |
| CF64 | Penarth | 102 ppm | Slightly Hard | |
| CF31 | Bridgend | 101 ppm | Slightly Hard | |
| CF63 | Barry | 101 ppm | Slightly Hard | |
| CF62 | Barry | 100 ppm | Slightly Hard | |
| CF61 | Llantwit Major | 99 ppm | Slightly Hard | |
| CF5 | Cardiff | 74 ppm | Slightly Hard | |
| CF3 | Cardiff | 72 ppm | Slightly Hard | |
| CF2 | Cardiff | 71 ppm | Slightly Hard | |
| CF24 | Cardiff | 71 ppm | Slightly Hard | |
| CF23 | Cardiff | 70 ppm | Slightly Hard | |
| CF83 | Caerphilly | 66 ppm | Slightly Hard | |
| CF82 | Hengoed | 65 ppm | Slightly Hard | |
| CF81 | Bargoed | 64 ppm | Slightly Hard | |
| CF48 | Merthyr Tydfil | 40 ppm | Soft | |
| CF15 | Cardiff | 39 ppm | Soft | |
| CF47 | Merthyr Tydfil | 39 ppm | Soft | |
| CF14 | Cardiff | 38 ppm | Soft | |
| CF46 | Treharris | 38 ppm | Soft | |
| CF45 | Mountain Ash | 37 ppm | Soft | |
| CF44 | Aberdare | 36 ppm | Soft | |
| CF11 | Cardiff | 35 ppm | Soft | |
| CF43 | Ferndale | 35 ppm | Soft | |
| CF10 | Cardiff | 34 ppm | Soft | |
| CF42 | Treorchy | 34 ppm | Soft | |
| CF41 | Pentre | 33 ppm | Soft | |
| CF40 | Tonypandy | 32 ppm | Soft | |
| CF72 | Pontyclun | 32 ppm | Soft | |
| CF71 | Cowbridge | 31 ppm | Soft |
Hard Water Guides
Learn more about water hardness and how to manage it.
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