Official Supplier Data: Dŵr Cymru Welsh Water • DWI & BS 7593 Standards
Water Hardness in NP25
Official water quality verdict for outcode NP25: classified as Soft Water (73.8 PPM), supplied and treated by Dŵr Cymru Welsh Water across 4 sectors.
Rating: Soft Water73.8 PPM • 5.2° ClarkSupplier: Dŵr Cymru Welsh Water-63% below UK average
Outcode Mean Hardness73.8 PPM5.2° Clark • Soft Water7.4°fH • 4.1°dH
Outcode NP25 Household Water Quality Verdict & Practical Advice
Domestic tap water in outcode NP25 is officially classified as soft water, averaging 73.8 PPM (mg/L CaCO₃) or 5.2° Clark, supplied and treated by Dŵr Cymru Welsh Water across all 4 postcode sectors (577 postcodes). Readings range from 45 PPM (NP25 3) to 160 PPM (NP25 4), showing a local disparity of 115 PPM.
☕ Kettle & Tea Quality:
Naturally soft water leaves kettles clear of mineral furring. Your tea brews bright and clean with zero tea scum.
🚿 Skin & Bathing:
Gentle on sensitive skin and eczema-prone households. Soaps lather richly with small amounts of product.
🍽️ Appliances & Salt:
Dishwasher salt top-up is optional or minimal (setting H00 (No salt required)). Boilers operate at peak thermal efficiency without scale.
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vs. UK Benchmark-63% Softervs 200 PPM national average
Statistical distribution across all 4 postcode sectors and 577 delivery points under Dŵr Cymru Welsh Water's catchment monitoring:
Analyzed Sectors4577 postcodes
PPM Spread (Min - Max)45 – 160Variance: 115 PPM
Predominant ZoneSoft Water0% hard/very hard
Regulating AuthorityDŵr Cymru Welsh WaterDWI Regulated Supply
Hydro Metric
Outcode NP25 Level
UK National Reference
Regional Status
Mean Mineral Density
73.8 PPM (5.2 °Clark)
200 PPM (14.0 °Clark)
-63% below baseline
French & German Scale
7.4 °fH / 4.1 °dH
20.0 °fH / 11.2 °dH
European standard conversion
Catchment Uniformity
Variable (115 PPM disparity)
Regional blending standard
4 Sub-catchments
Dishwasher Salt Calibration
H00 (No salt required)
Bosch H03 / Beko Level 2
Salt optional
Regional Hydro-Geological Overview
Water Hardness Breakdown: Outcode NP25
Water hardness isn't identical across every street in NP25—there is a 115 PPM variance between neighborhoods. Residents in sector NP25 3 enjoy the softest water at 45 PPM, whereas taps in sector NP25 4 register the highest mineral load at 160 PPM. This localized disparity occurs because Dŵr Cymru Welsh Water blends supplies from different boreholes, rivers, and storage reservoirs depending on elevation and seasonal demand.
Tap water supplied to NP25 by Dŵr Cymru Welsh Water originates predominantly from upland surface reservoirs and catchments surrounded by hard, impermeable granite or sandstone geology. Because rainwater runs off dense bedrock without dissolving heavy calcium deposits, it arrives at local taps naturally soft at 73.8 PPM, keeping plumbing networks clear without requiring water softeners.
Estimated Annual Household Financial Impact
Limescale & Appliance Operating Costs in Outcode NP25
Based on 73.8 PPM mineral saturation (Soft Water), operating heating appliances across NP25's 577 households carries distinct annual economic consequences:
Extra Combi Boiler Gas Cost£0 (Optimal heat transfer)
Q: What is the average water hardness in outcode NP25?
Tap water across outcode NP25 averages 73.8 PPM (mg/L), which equals 5.2° Clark, 7.4°fH, or 4.1°dH. It is officially classified as soft water water supplied by Dŵr Cymru Welsh Water.
Q: Is water in NP25 harder than the UK national average?
The UK baseline average is approximately 200 PPM. At 73.8 PPM, water in outcode NP25 is 63% softer than the national benchmark.
Q: What dishwasher salt setting is recommended for NP25?
For Bosch, Siemens, and Neff dishwashers in outcode NP25 (73.8 PPM), the recommended softener setting is H00 (No salt required).
Q: Who manages the municipal water supply in outcode NP25?
Public tap water infrastructure across all 4 sectors in outcode NP25 is distributed and monitored by Dŵr Cymru Welsh Water.
All Postcode Sectors in NP25
Select a postcode sector below to view exact water softener salt settings, limescale protection guides, and appliance recommendations.