Official Supplier Data: Portsmouth Water • DWI & BS 7593 Standards
Water Hardness in PO9
Official water quality verdict for outcode PO9: classified as Hard Water (250 PPM), supplied and treated by Portsmouth Water across 7 sectors.
Rating: Hard Water250 PPM • 17.5° ClarkSupplier: Portsmouth Water+25% above UK average
Outcode Mean Hardness250 PPM17.5° Clark • Hard Water25.0°fH • 14.0°dH
Outcode PO9 Household Water Quality Verdict & Practical Advice
Domestic tap water in outcode PO9 is officially classified as hard water, averaging 250 PPM (mg/L CaCO₃) or 17.5° Clark, supplied and treated by Portsmouth Water across all 7 postcode sectors (1,222 postcodes). Readings range from 250 PPM (PO9 1) to 250 PPM (PO9 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+25% Hardervs 200 PPM national average
If you have recently moved to PO9 or are setting up new kitchen appliances, getting your local water hardness right makes all the difference. Official water testing records from Portsmouth Water show a baseline mineral level of 250 PPM (17.5° Clark) across PO9's 1,222 postcodes. That classifies this postal area as hard water, directly impacting how often you need to top up dishwasher salt and how fast heating elements fur up with scale.
Water hardness is remarkably consistent across all 7 sectors of PO9, with readings holding steady at 250 PPM from PO9 1 through to PO9 9. This uniform profile means every household on the Portsmouth 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 PO9 maintains an average mineral density of 250 PPM, ensuring consistent municipal distribution and wholesome tap drinking water from Portsmouth Water.
Hard water in PO9 (250 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 1,222 postcodes.
Estimated Annual Household Financial Impact
Limescale & Appliance Operating Costs in Outcode PO9
Based on 250 PPM mineral saturation (Hard Water), operating heating appliances across PO9's 1,222 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 PO9 is supplied from a unified distribution network managed by Portsmouth Water. With all 7 sectors presenting an identical mineral concentration of 250 PPM, households across all 1,222 postcodes share uniform limescale risk profiles and identical appliance salt calibrations (H04 – H05).
Frequently Asked Questions: Water in Outcode PO9
Q: What is the average water hardness in outcode PO9?
Tap water across outcode PO9 averages 250 PPM (mg/L), which equals 17.5° Clark, 25.0°fH, or 14.0°dH. It is officially classified as hard water water supplied by Portsmouth Water.
Q: Is water in PO9 harder than the UK national average?
The UK baseline average is approximately 200 PPM. At 250 PPM, water in outcode PO9 is 25% harder than the national benchmark.
Q: What dishwasher salt setting is recommended for PO9?
For Bosch, Siemens, and Neff dishwashers in outcode PO9 (250 PPM), the recommended softener setting is H04 – H05.
Q: Who manages the municipal water supply in outcode PO9?
Public tap water infrastructure across all 7 sectors in outcode PO9 is distributed and monitored by Portsmouth Water.
All Postcode Sectors in PO9
Select a postcode sector below to view exact water softener salt settings, limescale protection guides, and appliance recommendations.