Official Supplier Data: South West Water • DWI & BS 7593 Standards
Water Hardness in BH21
Official water quality verdict for outcode BH21: classified as Soft Water (67.8 PPM), supplied and treated by South West Water across 9 sectors.
Rating: Soft Water67.8 PPM • 4.7° ClarkSupplier: South West Water-66% below UK average
Outcode Mean Hardness67.8 PPM4.7° Clark • Soft Water6.8°fH • 3.8°dH
Outcode BH21 Household Water Quality Verdict & Practical Advice
Domestic tap water in outcode BH21 is officially classified as soft water, averaging 67.8 PPM (mg/L CaCO₃) or 4.7° Clark, supplied and treated by South West Water across all 9 postcode sectors (1,489 postcodes). Readings range from 40 PPM (BH21 1) to 290 PPM (BH21 3), showing a local disparity of 250 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-66% Softervs 200 PPM national average
Statistical distribution across all 9 postcode sectors and 1,489 delivery points under South West Water's catchment monitoring:
Analyzed Sectors91,489 postcodes
PPM Spread (Min - Max)40 – 290Variance: 250 PPM
Predominant ZoneSoft Water11% hard/very hard
Regulating AuthoritySouth West WaterDWI Regulated Supply
Hydro Metric
Outcode BH21 Level
UK National Reference
Regional Status
Mean Mineral Density
67.8 PPM (4.7 °Clark)
200 PPM (14.0 °Clark)
-66% below baseline
French & German Scale
6.8 °fH / 3.8 °dH
20.0 °fH / 11.2 °dH
European standard conversion
Catchment Uniformity
Variable (250 PPM disparity)
Regional blending standard
9 Sub-catchments
Dishwasher Salt Calibration
H00 (No salt required)
Bosch H03 / Beko Level 2
Salt optional
Regional Hydro-Geological Overview
Water Hardness Breakdown: Outcode BH21
Water hardness isn't identical across every street in BH21—there is a 250 PPM variance between neighborhoods. Residents in sector BH21 1 enjoy the softest water at 40 PPM, whereas taps in sector BH21 3 register the highest mineral load at 290 PPM. This localized disparity occurs because South West Water blends supplies from different boreholes, rivers, and storage reservoirs depending on elevation and seasonal demand.
Supplies across BH21 are managed by South West Water 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 67.8 PPM across all 1,489 local postcodes under strict Drinking Water Inspectorate (DWI) compliance.
Estimated Annual Household Financial Impact
Limescale & Appliance Operating Costs in Outcode BH21
Based on 67.8 PPM mineral saturation (Soft Water), operating heating appliances across BH21's 1,489 households carries distinct annual economic consequences:
Extra Combi Boiler Gas Cost£0 (Optimal heat transfer)
Q: What is the average water hardness in outcode BH21?
Tap water across outcode BH21 averages 67.8 PPM (mg/L), which equals 4.7° Clark, 6.8°fH, or 3.8°dH. It is officially classified as soft water water supplied by South West Water.
Q: Is water in BH21 harder than the UK national average?
The UK baseline average is approximately 200 PPM. At 67.8 PPM, water in outcode BH21 is 66% softer than the national benchmark.
Q: What dishwasher salt setting is recommended for BH21?
For Bosch, Siemens, and Neff dishwashers in outcode BH21 (67.8 PPM), the recommended softener setting is H00 (No salt required).
Q: Who manages the municipal water supply in outcode BH21?
Public tap water infrastructure across all 9 sectors in outcode BH21 is distributed and monitored by South West Water.
All Postcode Sectors in BH21
Select a postcode sector below to view exact water softener salt settings, limescale protection guides, and appliance recommendations.