Official water quality verdict for outcode CH5: classified as Moderately Hard Water (148 PPM), supplied and treated by Severn Trent / Hafren Dyfrdwy across 5 sectors.
Rating: Moderately Hard Water148 PPM • 10.4° ClarkSupplier: Severn Trent / Hafren Dyfrdwy-26% below UK average
Outcode Mean Hardness148 PPM10.4° Clark • Moderately Hard Water14.8°fH • 8.3°dH
Outcode CH5 Household Water Quality Verdict & Practical Advice
Domestic tap water in outcode CH5 is officially classified as moderately hard water, averaging 148 PPM (mg/L CaCO₃) or 10.4° Clark, supplied and treated by Severn Trent / Hafren Dyfrdwy across all 5 postcode sectors (1,165 postcodes). Readings range from 140 PPM (CH5 2) to 150 PPM (CH5 9), showing a local disparity of 10 PPM.
☕ Kettle & Tea Quality:
Gradual chalky ring forms in kettles over 2–3 months. Descale quarterly with citric acid crystals to keep heating elements clean.
🚿 Skin & Bathing:
Moderate mineral content is generally gentle on skin, producing normal lather with everyday soaps and shampoos.
🍽️ Appliances & Salt:
Set dishwashers to H02 – H03 to avoid cloudy glassware, and check boiler inhibitor levels at your annual service.
Local Installer Quote Network
Protect Your Heating & Appliances in CH5 (148 PPM): Compare Local Specialists
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vs. UK Benchmark-26% Softervs 200 PPM national average
If you have recently moved to CH5 or are setting up new kitchen appliances, getting your local water hardness right makes all the difference. Official water testing records from Severn Trent / Hafren Dyfrdwy show a baseline mineral level of 148 PPM (10.4° Clark) across CH5's 1,165 postcodes. That classifies this postal area as moderately hard water, directly impacting how often you need to top up dishwasher salt and how fast heating elements fur up with scale.
Water hardness isn't identical across every street in CH5—there is a 10 PPM variance between neighborhoods. Residents in sector CH5 2 enjoy the softest water at 140 PPM, whereas taps in sector CH5 9 register the highest mineral load at 150 PPM. This localized disparity occurs because Severn Trent / Hafren Dyfrdwy blends supplies from different boreholes, rivers, and storage reservoirs depending on elevation and seasonal demand.
Supplies across CH5 are managed by Severn Trent / Hafren Dyfrdwy through a balanced mix of lowland river abstraction and regional storage reservoirs. Water hardness fluctuates moderately between wet winter periods and dry summer months, averaging 148 PPM across all 1,165 local postcodes under strict Drinking Water Inspectorate (DWI) compliance.
Households across CH5's 1,165 postcodes experience manageable mineral levels. While heating efficiency losses remain mild (4% – 7%), routine descaling of steam irons and thermostatic shower cartridges prevents gradual mineral clogging.
Estimated Annual Household Financial Impact
Limescale & Appliance Operating Costs in Outcode CH5
Based on 148 PPM mineral saturation (Moderately Hard Water), operating heating appliances across CH5's 1,165 households carries distinct annual economic consequences:
Q: What is the average water hardness in outcode CH5?
Tap water across outcode CH5 averages 148 PPM (mg/L), which equals 10.4° Clark, 14.8°fH, or 8.3°dH. It is officially classified as moderately hard water water supplied by Severn Trent / Hafren Dyfrdwy.
Q: Is water in CH5 harder than the UK national average?
The UK baseline average is approximately 200 PPM. At 148 PPM, water in outcode CH5 is 26% softer than the national benchmark.
Q: What dishwasher salt setting is recommended for CH5?
For Bosch, Siemens, and Neff dishwashers in outcode CH5 (148 PPM), the recommended softener setting is H02 – H03.
Q: Who manages the municipal water supply in outcode CH5?
Public tap water infrastructure across all 5 sectors in outcode CH5 is distributed and monitored by Severn Trent / Hafren Dyfrdwy.
All Postcode Sectors in CH5
Select a postcode sector below to view exact water softener salt settings, limescale protection guides, and appliance recommendations.