Official Supplier Data: Bristol Water • DWI & BS 7593 Standards
Water Hardness in BS21
Official water quality verdict for outcode BS21: classified as Hard Water (265 PPM), supplied and treated by Bristol Water across 4 sectors.
Rating: Hard Water265 PPM • 18.6° ClarkSupplier: Bristol Water+33% above UK average
Outcode Mean Hardness265 PPM18.6° Clark • Hard Water26.5°fH • 14.8°dH
Outcode BS21 Household Water Quality Verdict & Practical Advice
Domestic tap water in outcode BS21 is officially classified as hard water, averaging 265 PPM (mg/L CaCO₃) or 18.6° Clark, supplied and treated by Bristol Water across all 4 postcode sectors (695 postcodes). Readings range from 265 PPM (BS21 5) to 265 PPM (BS21 9) with consistent mineral levels throughout.
☕ 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+33% Hardervs 200 PPM national average
Serving 695 homes and businesses across outcode BS21, mains tap water supplied by Bristol Water registers an average mineral density of 265 PPM (26.5°fH / 14.8°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 is remarkably consistent across all 4 sectors of BS21, with readings holding steady at 265 PPM from BS21 5 through to BS21 9. This uniform profile means every household on the Bristol Water network in this zone shares the same appliance settings and kettle descaling routine.
Treated in strict compliance with Drinking Water Inspectorate (DWI) standards, tap water in BS21 maintains an average mineral density of 265 PPM, ensuring consistent municipal distribution and wholesome tap drinking water from Bristol Water.
With tap water averaging 265 PPM in outcode BS21, proactive limescale prevention is essential. Expect rapid limescale buildup in kettles—monthly descaling with white vinegar or food-grade citric acid crystals keeps the heating base efficient and stops chalky flakes falling into your tea. Combi boiler heat exchangers are also susceptible to scale encrustation, which can increase annual gas heating bills by 10% – 15% without inline scale protection under British Standard BS 7593.
Estimated Annual Household Financial Impact
Limescale & Appliance Operating Costs in Outcode BS21
Based on 265 PPM mineral saturation (Hard Water), operating heating appliances across BS21's 695 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.
Tap water throughout outcode BS21 is supplied from a unified distribution network managed by Bristol Water. With all 4 sectors presenting an identical mineral concentration of 265 PPM, households across all 695 postcodes share uniform limescale risk profiles and identical appliance salt calibrations (H04 – H05).
Frequently Asked Questions: Water in Outcode BS21
Q: What is the average water hardness in outcode BS21?
Tap water across outcode BS21 averages 265 PPM (mg/L), which equals 18.6° Clark, 26.5°fH, or 14.8°dH. It is officially classified as hard water water supplied by Bristol Water.
Q: Is water in BS21 harder than the UK national average?
The UK baseline average is approximately 200 PPM. At 265 PPM, water in outcode BS21 is 33% harder than the national benchmark.
Q: What dishwasher salt setting is recommended for BS21?
For Bosch, Siemens, and Neff dishwashers in outcode BS21 (265 PPM), the recommended softener setting is H04 – H05.
Q: Who manages the municipal water supply in outcode BS21?
Public tap water infrastructure across all 4 sectors in outcode BS21 is distributed and monitored by Bristol Water.
All Postcode Sectors in BS21
Select a postcode sector below to view exact water softener salt settings, limescale protection guides, and appliance recommendations.