Welsh Water (Dwr Cymru) Water Hardness

Wales & Herefordshire • 214 postcodes served

Slightly Hard

Average ppm

Minimum ppm

120

Maximum ppm

214

Postcodes Served

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.

Hardness Distribution

108

Soft (50%)

106

Slightly Hard (50%)

Moderate (0%)

Hard (0%)

Very Hard (0%)

All Areas Served by Welsh Water (Dwr Cymru)

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

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