Wales & Herefordshire · Water company

Welsh Water (Dwr Cymru) Hardness

Average 68 ppm across 214 postcodes served.

  • Range 20–120 ppm
  • Region Wales & Herefordshire
  • Postcodes 214
Company average
68
ppm CaCO₃
Slightly Hard
Soft
Moderate
Hard
Very hard
0100200300400+
68
Avg ppm
20
Min ppm
120
Max ppm
214
Postcodes

About Welsh Water (Dwr Cymru)

Welsh Water supplies 3 million customers across most of Wales and parts of western England. Welsh upland reservoirs provide predominantly soft water from ancient rock geology.

At 68 ppm on average, Welsh Water (Dwr Cymru) ranks as slightly hard water. See how it compares across the UK in our 50 softest water areas ranking.

Worth reading: our water softener guide compares the options for Welsh Water (Dwr Cymru) customers, and our limescale removal guide has quick fixes for kettles, taps, and boilers.

Distribution

Hardness Breakdown

108
Soft
(50%)
106
Slightly Hard
(50%)
0
Moderate
(0%)
0
Hard
(0%)
0
Very Hard
(0%)
All areas

Areas Served by Welsh Water (Dwr Cymru)

Every postcode district, sorted by hardness.

Postcode Town Hardness PPM Level
SY10 Oswestry
120
120 ppm Slightly Hard
NP19 Newport
119
119 ppm Slightly Hard
NP18 Newport
118
118 ppm Slightly Hard
SA39 Pencader
117
117 ppm Slightly Hard
LD8 Presteigne
116
116 ppm Slightly Hard
NP16 Chepstow
116
116 ppm Slightly Hard
SA38 Newcastle Emlyn
116
116 ppm Slightly Hard
LD7 Knighton
115
115 ppm Slightly Hard
NP15 Usk
115
115 ppm Slightly Hard
SA37 Boncath
115
115 ppm Slightly Hard
SA69 Saundersfoot
115
115 ppm Slightly Hard
LD6 Rhayader
114
114 ppm Slightly Hard
SA36 Glogue
114
114 ppm Slightly Hard
SA68 Kilgetty
114
114 ppm Slightly Hard
LD5 Llanwrtyd Wells
113
113 ppm Slightly Hard
NP13 Abertillery
113
113 ppm Slightly Hard
SA35 Llanfyrnach
113
113 ppm Slightly Hard
SA67 Narberth
113
113 ppm Slightly Hard
LD4 Llangammarch Wells
112
112 ppm Slightly Hard
NP12 Blackwood
112
112 ppm Slightly Hard
NP44 Cwmbran
112
112 ppm Slightly Hard
SA34 Whitland
112
112 ppm Slightly Hard
SA66 Clynderwen
112
112 ppm Slightly Hard
LD3 Brecon
111
111 ppm Slightly Hard
NP11 Newport
111
111 ppm Slightly Hard
SA33 Carmarthen
111
111 ppm Slightly Hard
SA65 Fishguard
111
111 ppm Slightly Hard
LD2 Builth Wells
110
110 ppm Slightly Hard
NP10 Newport
110
110 ppm Slightly Hard
SA32 Carmarthen
110
110 ppm Slightly Hard
SA64 Goodwick
110
110 ppm Slightly Hard
CF39 Porth
109
109 ppm Slightly Hard
LD1 Llandrindod Wells
109
109 ppm Slightly Hard
LL39 Arthog
109
109 ppm Slightly Hard
SA31 Carmarthen
109
109 ppm Slightly Hard
SA63 Clarbeston Road
109
109 ppm Slightly Hard
CF38 Pontypridd
108
108 ppm Slightly Hard
LL38 Fairbourne
108
108 ppm Slightly Hard
SA62 Haverfordwest
108
108 ppm Slightly Hard
CF37 Pontypridd
107
107 ppm Slightly Hard
LL37 Llwyngwril
107
107 ppm Slightly Hard
LL69 Penysarn
107
107 ppm Slightly Hard
SA61 Haverfordwest
107
107 ppm Slightly Hard
CF36 Porthcawl
106
106 ppm Slightly Hard
LL36 Tywyn
106
106 ppm Slightly Hard
LL68 Amlwch
106
106 ppm Slightly Hard
CF35 Bridgend
105
105 ppm Slightly Hard
LL35 Aberdovey
105
105 ppm Slightly Hard
LL67 Cemaes Bay
105
105 ppm Slightly Hard
CF34 Maesteg
104
104 ppm Slightly Hard
LL34 Penmaenmawr
104
104 ppm Slightly Hard
LL66 Rhosgoch
104
104 ppm Slightly Hard
CF33 Bridgend
103
103 ppm Slightly Hard
LL33 Llanfairfechan
103
103 ppm Slightly Hard
LL65 Holyhead
103
103 ppm Slightly Hard
CF32 Bridgend
102
102 ppm Slightly Hard
CF64 Penarth
102
102 ppm Slightly Hard
LL32 Conwy
102
102 ppm Slightly Hard
LL64 Rhosneigr
102
102 ppm Slightly Hard
CF31 Bridgend
101
101 ppm Slightly Hard
CF63 Barry
101
101 ppm Slightly Hard
LL31 Llandudno Junction
101
101 ppm Slightly Hard
LL63 Ty Croes
101
101 ppm Slightly Hard
CF62 Barry
100
100 ppm Slightly Hard
LL30 Llandudno
100
100 ppm Slightly Hard
LL62 Bodorgan
100
100 ppm Slightly Hard
CF61 Llantwit Major
99
99 ppm Slightly Hard
LL61 Llanfairpwllgwyngyll
99
99 ppm Slightly Hard
LL60 Gaerwen
98
98 ppm Slightly Hard
LL29 Colwyn Bay
76
76 ppm Slightly Hard
LL28 Colwyn Bay
75
75 ppm Slightly Hard
SA20 Llandovery
75
75 ppm Slightly Hard
CF5 Cardiff
74
74 ppm Slightly Hard
LL27 Trefriw
74
74 ppm Slightly Hard
LL59 Menai Bridge
74
74 ppm Slightly Hard
LL26 Llanrwst
73
73 ppm Slightly Hard
LL58 Beaumaris
73
73 ppm Slightly Hard
CF3 Cardiff
72
72 ppm Slightly Hard
LL25 Dolwyddelan
72
72 ppm Slightly Hard
LL57 Bangor
72
72 ppm Slightly Hard
CF2 Cardiff
71
71 ppm Slightly Hard
CF24 Cardiff
71
71 ppm Slightly Hard
LL24 Betws Y Coed
71
71 ppm Slightly Hard
LL56 Y Felinheli
71
71 ppm Slightly Hard
CF23 Cardiff
70
70 ppm Slightly Hard
LL23 Bala
70
70 ppm Slightly Hard
LL55 Caernarfon
70
70 ppm Slightly Hard
LL22 Abergele
69
69 ppm Slightly Hard
LL54 Caernarfon
69
69 ppm Slightly Hard
LL21 Corwen
68
68 ppm Slightly Hard
LL53 Pwllheli
68
68 ppm Slightly Hard
LL20 Llangollen
67
67 ppm Slightly Hard
LL52 Criccieth
67
67 ppm Slightly Hard
CF83 Caerphilly
66
66 ppm Slightly Hard
LL51 Garndolbenmaen
66
66 ppm Slightly Hard
SA9 Swansea
66
66 ppm Slightly Hard
CF82 Hengoed
65
65 ppm Slightly Hard
SA8 Swansea
65
65 ppm Slightly Hard
CF81 Bargoed
64
64 ppm Slightly Hard
NP8 Crickhowell
64
64 ppm Slightly Hard
SA7 Swansea
64
64 ppm Slightly Hard
NP7 Abergavenny
63
63 ppm Slightly Hard
SA6 Swansea
63
63 ppm Slightly Hard
SA5 Swansea
62
62 ppm Slightly Hard
HR9 Ross On Wye
61
61 ppm Slightly Hard
SA4 Swansea
61
61 ppm Slightly Hard
HR8 Ledbury
60
60 ppm Soft
NP4 Pontypool
60
60 ppm Soft
SA3 Swansea
60
60 ppm Soft
HR7 Bromyard
59
59 ppm Soft
SA2 Swansea
59
59 ppm Soft
HR6 Leominster
58
58 ppm Soft
SA1 Swansea
58
58 ppm Soft
HR5 Kington
57
57 ppm Soft
SY25 Tregaron
57
57 ppm Soft
HR4 Hereford
56
56 ppm Soft
SY24 Bow Street
56
56 ppm Soft
HR3 Hereford
55
55 ppm Soft
SY23 Aberystwyth
55
55 ppm Soft
HR2 Hereford
54
54 ppm Soft
SY22 Llanymynech
54
54 ppm Soft
HR1 Hereford
53
53 ppm Soft
SY21 Welshpool
53
53 ppm Soft
SY20 Machynlleth
52
52 ppm Soft
SA19 Llandeilo
51
51 ppm Soft
SA18 Ammanford
50
50 ppm Soft
SY9 Bishops Castle
50
50 ppm Soft
SA17 Kidwelly
49
49 ppm Soft
SY8 Ludlow
49
49 ppm Soft
NP26 Caldicot
48
48 ppm Soft
SA16 Burry Port
48
48 ppm Soft
SA48 Lampeter
48
48 ppm Soft
SY7 Craven Arms
48
48 ppm Soft
NP25 Monmouth
47
47 ppm Soft
SA15 Llanelli
47
47 ppm Soft
SA47 Llanarth
47
47 ppm Soft
SY6 Church Stretton
47
47 ppm Soft
NP24 New Tredegar
46
46 ppm Soft
SA14 Llanelli
46
46 ppm Soft
SA46 Aberaeron
46
46 ppm Soft
SY5 Shrewsbury
46
46 ppm Soft
NP23 Ebbw Vale
45
45 ppm Soft
SA13 Port Talbot
45
45 ppm Soft
SA45 New Quay
45
45 ppm Soft
SY4 Shrewsbury
45
45 ppm Soft
NP22 Tredegar
44
44 ppm Soft
SA12 Port Talbot
44
44 ppm Soft
SA44 Llandysul
44
44 ppm Soft
SY3 Shrewsbury
44
44 ppm Soft
LL19 Prestatyn
43
43 ppm Soft
SA11 Neath
43
43 ppm Soft
SA43 Cardigan
43
43 ppm Soft
SY2 Shrewsbury
43
43 ppm Soft
LL18 Rhyl
42
42 ppm Soft
NP20 Newport
42
42 ppm Soft
SA10 Neath
42
42 ppm Soft
SA42 Newport
42
42 ppm Soft
SY1 Shrewsbury
42
42 ppm Soft
LL17 St Asaph
41
41 ppm Soft
LL49 Porthmadog
41
41 ppm Soft
SA41 Crymych
41
41 ppm Soft
SA73 Milford Haven
41
41 ppm Soft
CF48 Merthyr Tydfil
40
40 ppm Soft
LL16 Denbigh
40
40 ppm Soft
LL48 Penrhyndeudraeth
40
40 ppm Soft
SA40 Llanybydder
40
40 ppm Soft
SA72 Pembroke Dock
40
40 ppm Soft
CF15 Cardiff
39
39 ppm Soft
CF47 Merthyr Tydfil
39
39 ppm Soft
LL15 Ruthin
39
39 ppm Soft
LL47 Talsarnau
39
39 ppm Soft
SA71 Pembroke
39
39 ppm Soft
CF14 Cardiff
38
38 ppm Soft
CF46 Treharris
38
38 ppm Soft
LL14 Wrexham
38
38 ppm Soft
LL46 Harlech
38
38 ppm Soft
LL78 Brynteg
38
38 ppm Soft
SA70 Tenby
38
38 ppm Soft
CF45 Mountain Ash
37
37 ppm Soft
LL13 Wrexham
37
37 ppm Soft
LL45 Llanbedr
37
37 ppm Soft
LL77 Llangefni
37
37 ppm Soft
CF44 Aberdare
36
36 ppm Soft
LL12 Wrexham
36
36 ppm Soft
LL44 Dyffryn Ardudwy
36
36 ppm Soft
LL76 Llanbedrgoch
36
36 ppm Soft
CF11 Cardiff
35
35 ppm Soft
CF43 Ferndale
35
35 ppm Soft
LL11 Wrexham
35
35 ppm Soft
LL43 Talybont
35
35 ppm Soft
LL75 Pentraeth
35
35 ppm Soft
CF10 Cardiff
34
34 ppm Soft
CF42 Treorchy
34
34 ppm Soft
LL42 Barmouth
34
34 ppm Soft
LL74 Tyn Y Gongl
34
34 ppm Soft
CF41 Pentre
33
33 ppm Soft
LL41 Blaenau Ffestiniog
33
33 ppm Soft
LL73 Marianglas
33
33 ppm Soft
CF40 Tonypandy
32
32 ppm Soft
CF72 Pontyclun
32
32 ppm Soft
LL40 Dolgellau
32
32 ppm Soft
LL72 Moelfre
32
32 ppm Soft
CF71 Cowbridge
31
31 ppm Soft
LL71 Llannerch Y Medd
31
31 ppm Soft
LL70 Dulas
30
30 ppm Soft
SY19 Llanbrynmair
28
28 ppm Soft
SY18 Llanidloes
27
27 ppm Soft
SY17 Caersws
26
26 ppm Soft
SY16 Newtown
25
25 ppm Soft
SY15 Montgomery
24
24 ppm Soft
SY14 Malpas
23
23 ppm Soft
SY13 Whitchurch
22
22 ppm Soft
SY12 Ellesmere
21
21 ppm Soft
SY11 Oswestry
20
20 ppm Soft

Test Your Water on Welsh Water (Dwr Cymru)

At 68 ppm on average, your water is slightly hard. A home testing kit lets you verify the exact hardness for your postcode and check for other contaminants.

TESPERT 16-in-1 Water Testing Kit

From ~£10

Home water test strips that check hardness, pH, chlorine, lead, and 12 other parameters. Results in around 60 seconds. 125 strips per pack.

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FAQ

Common questions about Welsh Water (Dwr Cymru) water hardness

How do I check Welsh Water (Dwr Cymru) hardness by postcode?
Enter your postcode in the checker on the WaterHard.uk homepage, or find your district in the table above. Welsh Water (Dwr Cymru) serves 214 postcode districts across Wales & Herefordshire, ranging from 20 to 120 ppm.
Is there a Welsh Water (Dwr Cymru) hardness checker or map?
Welsh Water (Dwr Cymru) publishes water quality data by postcode, but it can be scattered across PDF reports. WaterHard.uk compiles it into the searchable table above so you can find your district's reading in one place.
How hard is Welsh Water (Dwr Cymru) water in my area?
It depends on your exact postcode. Welsh Water (Dwr Cymru) supplies range from 20 ppm to 120 ppm, averaging 68 ppm (slightly hard) across 214 postcode districts in Wales & Herefordshire. Use the table above to find your specific district.
Is Welsh Water (Dwr Cymru) water hard or soft?
Welsh Water (Dwr Cymru) averages 68 ppm, classified as slightly hard. Most households on Welsh Water (Dwr Cymru) see little to no limescale build-up, though individual postcodes can vary, so check the table above for your district.

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