Official Supplier Data: South East Water • DWI & BS 7593 Standards
Water Hardness in RH19
Official water quality verdict for outcode RH19: classified as Hard Water (268 PPM), supplied and treated by South East Water across 5 sectors.
Rating: Hard Water268 PPM • 18.8° ClarkSupplier: South East Water+34% above UK average
Outcode Mean Hardness268 PPM18.8° Clark • Hard Water26.8°fH • 15.0°dH
Outcode RH19 Household Water Quality Verdict & Practical Advice
Domestic tap water in outcode RH19 is officially classified as hard water, averaging 268 PPM (mg/L CaCO₃) or 18.8° Clark, supplied and treated by South East Water across all 5 postcode sectors (1,113 postcodes). Readings range from 260 PPM (RH19 2) to 270 PPM (RH19 9), showing a local disparity of 10 PPM.
☕ Kettle & Tea Quality:
Rapid limescale buildup in kettles with floating scum on your cuppa. Descale monthly using white vinegar or food-grade citric acid.
🚿 Skin & Bathing:
High calcium levels can aggravate dry skin & eczema sensitivity. Soap lathers less easily, often leaving a tight feeling after hot showers.
🍽️ Appliances & Salt:
Keep water softener salt topped up and calibrate dishwashers to H04 – H05. Protect combi boiler heat exchangers under BS 7593.
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vs. UK Benchmark+34% Hardervs 200 PPM national average
Statistical distribution across all 5 postcode sectors and 1,113 delivery points under South East Water's catchment monitoring:
Analyzed Sectors51,113 postcodes
PPM Spread (Min - Max)260 – 270Variance: 10 PPM
Predominant ZoneHard Water100% hard/very hard
Regulating AuthoritySouth East WaterDWI Regulated Supply
Hydro Metric
Outcode RH19 Level
UK National Reference
Regional Status
Mean Mineral Density
268 PPM (18.8 °Clark)
200 PPM (14.0 °Clark)
+34% above baseline
French & German Scale
26.8 °fH / 15.0 °dH
20.0 °fH / 11.2 °dH
European standard conversion
Catchment Uniformity
Variable (10 PPM disparity)
Regional blending standard
5 Sub-catchments
Dishwasher Salt Calibration
H04 – H05
Bosch H03 / Beko Level 2
Salt required
Regional Hydro-Geological Overview
Water Hardness Breakdown: Outcode RH19
Serving 1,113 homes and businesses across outcode RH19, mains tap water supplied by South East Water registers an average mineral density of 268 PPM (26.8°fH / 15.0°dH). Rated as hard water, local water hardness determines how well laundry detergents lather, the rate of scale accumulation in combi boilers, and whether sensitive skin or eczema flares up after showers.
Water hardness isn't identical across every street in RH19—there is a 10 PPM variance between neighborhoods. Residents in sector RH19 2 enjoy the softest water at 260 PPM, whereas taps in sector RH19 9 register the highest mineral load at 270 PPM. This localized disparity occurs because South East Water blends supplies from different boreholes, rivers, and storage reservoirs depending on elevation and seasonal demand.
The reason tap water in RH19 carries significant dissolved minerals lies in local geology. South East Water abstracts substantial water supplies from subterranean chalk and limestone aquifers. As rainwater percolates through deep calcium-rich rock strata over decades, it dissolves natural calcium carbonate. While entirely safe and wholesome under Drinking Water Inspectorate (DWI) standards, these minerals precipitate out when heated above 60°C, leaving stubborn limescale deposits on heating coils.
Hard water in RH19 (268 PPM) often causes a cloudy scum on hot drinks and makes soap harder to lather, aggravating dry skin and eczema sensitivity after hot baths. For appliances, ensure regular water softener salt top-ups and calibrate your dishwasher to H04 – H05 to avoid cloudy glassware, white streaks, and heating element burnout across all 1,113 postcodes.
Estimated Annual Household Financial Impact
Limescale & Appliance Operating Costs in Outcode RH19
Based on 268 PPM mineral saturation (Hard Water), operating heating appliances across RH19's 1,113 households carries distinct annual economic consequences:
Extra Combi Boiler Gas Cost£130 – £190
Thermal heating transfer resistance caused by 1mm–1.5mm calcium carbonate build-up on heat exchangers.
Dishwasher Salt Requirement10 – 14 kg
Essential ion-exchange resin bed regeneration salt required to avoid glass clouding and element burnout.
Q: What is the average water hardness in outcode RH19?
Tap water across outcode RH19 averages 268 PPM (mg/L), which equals 18.8° Clark, 26.8°fH, or 15.0°dH. It is officially classified as hard water water supplied by South East Water.
Q: Is water in RH19 harder than the UK national average?
The UK baseline average is approximately 200 PPM. At 268 PPM, water in outcode RH19 is 34% harder than the national benchmark.
Q: What dishwasher salt setting is recommended for RH19?
For Bosch, Siemens, and Neff dishwashers in outcode RH19 (268 PPM), the recommended softener setting is H04 – H05.
Q: Who manages the municipal water supply in outcode RH19?
Public tap water infrastructure across all 5 sectors in outcode RH19 is distributed and monitored by South East Water.
All Postcode Sectors in RH19
Select a postcode sector below to view exact water softener salt settings, limescale protection guides, and appliance recommendations.