Coity Water Hardness & Quality Report (2026)
Water Hardness
5.4°Clark7.7°fH4.3°dH
Source
reservoir
pH Level
7.4
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
139.7 mg/L
Est. Daily Cost
£0.17
energy & soap waste
Source: DWI Data Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Coity, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Coity | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.1 yrs | 8.5 yrs | -16% |
| Washing Machine | 10.8 yrs | 12 yrs | -10% |
| Water Heater | 12.5 yrs | 15 yrs | -17% |
Regional Water Comparison
How Coity compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Coity, Wales | 77 mg/L | 5.4° | 🟡 Moderately Hard | reservoir |
| Bridgend, Wales | 62 mg/L | 4.3° | 🟡 Moderately Hard | reservoir |
| Aberkenfig, Wales | 78 mg/L | 5.5° | 🟡 Moderately Hard | reservoir |
| Llantwit Major, Wales | 131.5 mg/L | 9.2° | 🟠 Hard | reservoir |
| Maesteg, Wales | 107.5 mg/L | 7.5° | 🟡 Moderately Hard | reservoir |
National Benchmark
How Coity compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Coity | 77 mg/L | 🟡 Low |
| United Kingdom National Avg | 183 mg/L | 🔴 High |
| Livingston Top Rated | 8.5 mg/L | 🟢 None |
Bring Livingston-quality water to your Coity home
Shop water softeners on Amazon.co.uk →
What Makes Coity's Water Unique?
Local geology and source profile
Coity, a community village immediately north-east of Bridgend town in Bridgend County Borough, is supplied by Dŵr Cymru Welsh Water from the Ogmore Valley and Garw upland reservoirs and the broader south Wales valleys supply network. Welsh Water draws from upland reservoirs in the Garw and Ogmore valleys — impounding headwater streams from the Carboniferous Millstone Grit and Pennant Sandstone moorland of the south Wales coalfield uplands. These sandstone moorlands are calcium-poor and produce very soft water typical of the south Wales valleys supply zone. Welsh Water treats and distributes to Bridgend and surrounding communities including Coity from the Ogmore/Garw valley reservoir system.
Coity's soft water — 77 mg/L (5.4°Clark) — reflects the Carboniferous Millstone Grit and sandstone moorland catchments of the Ogmore and Garw valley reservoirs serving the Bridgend area. The Drinking Water Inspectorate Wales classifies this supply as soft.
Limescale is very minor in Coity. At 77 mg/L, limescale builds slowly — kettles need descaling every two to three months. Combi-boiler heat exchangers accumulate minimal deposits; annual servicing is routine. Showerheads and taps remain largely clear. Washing-up liquid lathers very well with the soft Welsh Water south Wales valleys supply. Limescale is not a significant domestic concern for Coity households on the Ogmore valley reservoir supply.
Geology & Source: Supplied by Dŵr Cymru Welsh Water from Ogmore Valley Reservoirs and the Garw catchment upland supply — Coity's Bridgend county borough position north-east of Bridgend draws on Welsh Water's very soft upland valley reservoir supply from the Carboniferous Millstone Grit and sandstone moorland of the south Wales valleys, producing soft water at 77 mg/L (5.4°Clark).