Official Supplier Data: Guernsey Water • DWI & BS 7593 Standards
Water Hardness in GY5
Official water quality verdict for outcode GY5: classified as Moderately Hard Water (140 PPM), supplied and treated by Guernsey Water across 1 sectors.
Rating: Moderately Hard Water140 PPM • 9.8° ClarkSupplier: Guernsey Water-30% below UK average
Outcode Mean Hardness140 PPM9.8° Clark • Moderately Hard Water14.0°fH • 7.8°dH
Outcode GY5 Household Water Quality Verdict & Practical Advice
Domestic tap water in outcode GY5 is officially classified as moderately hard water, averaging 140 PPM (mg/L CaCO₃) or 9.8° Clark, supplied and treated by Guernsey Water across all 1 postcode sectors (304 postcodes). Readings range from 140 PPM (GY5 7) to 140 PPM (GY5 7) with consistent mineral levels throughout.
☕ 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.
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vs. UK Benchmark-30% Softervs 200 PPM national average
Serving 304 homes and businesses across outcode GY5, mains tap water supplied by Guernsey Water registers an average mineral density of 140 PPM (14.0°fH / 7.8°dH). Rated as moderately 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 1 sectors of GY5, with readings holding steady at 140 PPM from GY5 7 through to GY5 7. This uniform profile means every household on the Guernsey 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 GY5 maintains an average mineral density of 140 PPM, ensuring consistent municipal distribution and wholesome tap drinking water from Guernsey Water.
With moderate water hardness (140 PPM) in GY5, kettles and showerheads build a light white chalk ring every 2–3 months. A quick rinse with warm water and white vinegar or food-grade citric acid crystals clears the element in minutes. To prevent cloudy glassware, maintain your dishwasher salt top-up set to H02 – H03. Combi boilers also benefit from regular inhibitor checks during annual boiler servicing in line with British Standard BS 7593.
Estimated Annual Household Financial Impact
Limescale & Appliance Operating Costs in Outcode GY5
Based on 140 PPM mineral saturation (Moderately Hard Water), operating heating appliances across GY5's 304 households carries distinct annual economic consequences:
Tap water throughout outcode GY5 is supplied from a unified distribution network managed by Guernsey Water. With sector GY5 7 presenting an identical mineral concentration of 140 PPM, households across all 304 postcodes share uniform limescale risk profiles and identical appliance salt calibrations (H02 – H03).
Frequently Asked Questions: Water in Outcode GY5
Q: What is the average water hardness in outcode GY5?
Tap water across outcode GY5 averages 140 PPM (mg/L), which equals 9.8° Clark, 14.0°fH, or 7.8°dH. It is officially classified as moderately hard water water supplied by Guernsey Water.
Q: Is water in GY5 harder than the UK national average?
The UK baseline average is approximately 200 PPM. At 140 PPM, water in outcode GY5 is 30% softer than the national benchmark.
Q: What dishwasher salt setting is recommended for GY5?
For Bosch, Siemens, and Neff dishwashers in outcode GY5 (140 PPM), the recommended softener setting is H02 – H03.
Q: Who manages the municipal water supply in outcode GY5?
Public tap water infrastructure across all 1 sectors in outcode GY5 is distributed and monitored by Guernsey Water.
All Postcode Sectors in GY5
Select a postcode sector below to view exact water softener salt settings, limescale protection guides, and appliance recommendations.