Rhondda Water Hardness & Quality Report (2026)
Water Hardness
~0–99 mg/L
Softestimated · not lab-verified
Source
reservoir
pH Level
7
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
8.7 mg/L
Est. Daily Cost
£0.11
energy & soap waste
Source: DWI Data Portal · Updated 2026
0–99
mg/L
Soft
100–149
mg/L
Slightly Hard
150–199
mg/L
Moderately Hard
200–300
mg/L
Hard
300+
mg/L
Very Hard
Appliance Damage Report
In Rhondda, your appliances are currently losing 7% efficiency due to mineral buildup.
| Appliance | In Rhondda | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.9 yrs | 8.5 yrs | -7% |
| Washing Machine | 11.2 yrs | 12 yrs | -7% |
| Water Heater | 14 yrs | 15 yrs | -7% |
Regional Water Comparison
How Rhondda compares to its nearest neighbours
| City | Hardness | Clark° | Risk | Source |
|---|---|---|---|---|
| ▶ Rhondda, Wales | ≈ 0–99 mg/L | 3.5° | 🟢 Soft | reservoir |
| Tonypandy, Wales | ≈ 200–300 mg/L | 8.1° | 🟠 Hard | reservoir |
| Aberdare, Wales | ≈ 0–100 mg/L | 5.5° | 🟢 Soft | reservoir |
| Mountain Ash, Wales | ≈ 0–100 mg/L | 5° | 🟢 Soft | reservoir |
| Merthyr Tydfil, Wales | 90.5 mg/L | 6.3° | 🟢 Soft | reservoir |
National Benchmark
How Rhondda compares to the United Kingdom average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Rhondda | ≈ 0–99 mg/L | 🟢 None |
| United Kingdom National Avg | 177 mg/L | 🟡 Moderate |
| Skipton Top Rated | 7.1 mg/L | 🟢 None |
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What Makes Rhondda's Water Unique?
Local geology and source profile
The water supply for Rhondda comes from Dŵr Cymru Welsh Water. While specific details about treatment plants and exact reservoir names are not readily available in the provided information, the supply is understood to originate from upland moorland reservoirs situated in the Rhondda Fawr and Fach valleys.
This region's geology is characterized by Carboniferous sandstone and shale formations. The interaction of the water with these rock types in the upland moorland environment results in a naturally soft water quality.
Residents in Rhondda will likely notice that soft water doesn't leave much residue on dishes or fixtures. You might find that you need less soap and detergent for cleaning tasks. Because the water is soft, it's less likely to cause scale buildup in appliances like kettles and water heaters, potentially extending their lifespan.
Geology & Source: Carboniferous sandstone and shale; upland moorland reservoirs produce soft water
Other Wales Water Reports
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