Wales · County

Water hardness in North Wales

Average 66 ppm across 67 postcodes and 1 towns.

  • Range 30–109 ppm
  • Towns 1
  • Suppliers Welsh Water (Dwr Cymru)
County average
66
ppm CaCO₃
Slightly Hard
Soft
Moderate
Hard
Very hard
0100200300400+
66
Avg ppm
30
Min ppm
109
Max ppm
67
Postcodes

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Water Hardness Across North Wales

The average water hardness in North Wales is 66 ppm, classified as slightly hard. Across 67 postcode districts in the Wales region, hardness ranges from 30 ppm to 109 ppm.

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

Hardness across North Wales ranges from 30 ppm to 109 ppm by postcode district. The county spans 1 towns and 67 postcode districts in total.

At 66 ppm, North Wales ranks as slightly hard water nationally. Compare it against the 50 softest water areas in the UK.

By town

Towns in North Wales

Sorted by hardness — tap a town for full details.

Town Hardness PPM Level
Wrexham
66
66 ppm Slightly Hard
Suppliers

Water Companies in North Wales

Companies supplying water to this county.

Welsh Water (Dwr Cymru)

68 ppm Slightly Hard
All postcodes

Postcodes in North Wales

Every postcode district in the county, sorted by hardness.

Postcode Town Hardness PPM Level
LL39 Arthog
109
109 ppm Slightly Hard
LL38 Fairbourne
108
108 ppm Slightly Hard
LL37 Llwyngwril
107
107 ppm Slightly Hard
LL69 Penysarn
107
107 ppm Slightly Hard
LL36 Tywyn
106
106 ppm Slightly Hard
LL68 Amlwch
106
106 ppm Slightly Hard
LL35 Aberdovey
105
105 ppm Slightly Hard
LL67 Cemaes Bay
105
105 ppm Slightly Hard
LL34 Penmaenmawr
104
104 ppm Slightly Hard
LL66 Rhosgoch
104
104 ppm Slightly Hard
LL33 Llanfairfechan
103
103 ppm Slightly Hard
LL65 Holyhead
103
103 ppm Slightly Hard
LL32 Conwy
102
102 ppm Slightly Hard
LL64 Rhosneigr
102
102 ppm Slightly Hard
LL31 Llandudno Junction
101
101 ppm Slightly Hard
LL63 Ty Croes
101
101 ppm Slightly Hard
LL30 Llandudno
100
100 ppm Slightly Hard
LL62 Bodorgan
100
100 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
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
LL25 Dolwyddelan
72
72 ppm Slightly Hard
LL57 Bangor
72
72 ppm Slightly Hard
LL24 Betws Y Coed
71
71 ppm Slightly Hard
LL56 Y Felinheli
71
71 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
LL51 Garndolbenmaen
66
66 ppm Slightly Hard
LL19 Prestatyn
43
43 ppm Soft
LL18 Rhyl
42
42 ppm Soft
LL17 St Asaph
41
41 ppm Soft
LL49 Porthmadog
41
41 ppm Soft
LL16 Denbigh
40
40 ppm Soft
LL48 Penrhyndeudraeth
40
40 ppm Soft
LL15 Ruthin
39
39 ppm Soft
LL47 Talsarnau
39
39 ppm Soft
LL14 Wrexham
38
38 ppm Soft
LL46 Harlech
38
38 ppm Soft
LL78 Brynteg
38
38 ppm Soft
LL13 Wrexham
37
37 ppm Soft
LL45 Llanbedr
37
37 ppm Soft
LL77 Llangefni
37
37 ppm Soft
LL12 Wrexham
36
36 ppm Soft
LL44 Dyffryn Ardudwy
36
36 ppm Soft
LL76 Llanbedrgoch
36
36 ppm Soft
LL11 Wrexham
35
35 ppm Soft
LL43 Talybont
35
35 ppm Soft
LL75 Pentraeth
35
35 ppm Soft
LL42 Barmouth
34
34 ppm Soft
LL74 Tyn Y Gongl
34
34 ppm Soft
LL41 Blaenau Ffestiniog
33
33 ppm Soft
LL73 Marianglas
33
33 ppm Soft
LL40 Dolgellau
32
32 ppm Soft
LL72 Moelfre
32
32 ppm Soft
LL71 Llannerch Y Medd
31
31 ppm Soft
LL70 Dulas
30
30 ppm Soft

Test Your Water in North Wales

At 66 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

Water Hardness in North Wales: Common Questions

Is the water in North Wales hard or soft?
North Wales has slightly hard water, averaging 66 ppm across 67 postcode districts. Limescale build-up is minimal at this level, though individual postcodes vary.
Where is the hardest water in North Wales?
Across North Wales, water hardness ranges from 30 ppm to 109 ppm by postcode district.
Which water company supplies North Wales?
North Wales is supplied by Welsh Water (Dwr Cymru). You can check each supplier's reported hardness figures on their water company page.
Do I need a water softener in North Wales?
At 66 ppm, North Wales has soft water and a whole-house softener is not needed.
What is the average water hardness in North Wales?
The average water hardness in North Wales is 66 ppm (parts per million), classified as slightly hard. It ranges from 30 ppm to 109 ppm across 67 postcode districts in the Wales region.

Hard Water Guides

Learn more about water hardness and how to manage it.

What Is Water Hardness? Hard Water Effects Solutions Water Softener Guide
All counties in Wales · Hardest water areas · Softest water areas · Hard water solutions
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