Official water quality verdict for outcode SY21: classified as Moderately Hard Water (140 PPM), supplied and treated by Hafren Dyfrdwy across 5 sectors.
Rating: Moderately Hard Water140 PPM • 9.8° ClarkSupplier: Hafren Dyfrdwy-30% below UK average
Outcode Mean Hardness140 PPM9.8° Clark • Moderately Hard Water14.0°fH • 7.8°dH
Outcode SY21 Household Water Quality Verdict & Practical Advice
Domestic tap water in outcode SY21 is officially classified as moderately hard water, averaging 140 PPM (mg/L CaCO₃) or 9.8° Clark, supplied and treated by Hafren Dyfrdwy across all 5 postcode sectors (871 postcodes). Readings range from 140 PPM (SY21 0) to 140 PPM (SY21 9) 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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Protect Your Heating & Appliances in SY21 (140 PPM): Compare Local Specialists
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vs. UK Benchmark-30% Softervs 200 PPM national average
If you have recently moved to SY21 or are setting up new kitchen appliances, getting your local water hardness right makes all the difference. Official water testing records from Hafren Dyfrdwy show a baseline mineral level of 140 PPM (9.8° Clark) across SY21's 871 postcodes. That classifies this postal area as moderately 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 5 sectors of SY21, with readings holding steady at 140 PPM from SY21 0 through to SY21 9. This uniform profile means every household on the Hafren Dyfrdwy 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 SY21 maintains an average mineral density of 140 PPM, ensuring consistent municipal distribution and wholesome tap drinking water from Hafren Dyfrdwy.
With moderate water hardness (140 PPM) in SY21, 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 SY21
Based on 140 PPM mineral saturation (Moderately Hard Water), operating heating appliances across SY21's 871 households carries distinct annual economic consequences:
Tap water throughout outcode SY21 is supplied from a unified distribution network managed by Hafren Dyfrdwy. With all 5 sectors presenting an identical mineral concentration of 140 PPM, households across all 871 postcodes share uniform limescale risk profiles and identical appliance salt calibrations (H02 – H03).
Frequently Asked Questions: Water in Outcode SY21
Q: What is the average water hardness in outcode SY21?
Tap water across outcode SY21 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 Hafren Dyfrdwy.
Q: Is water in SY21 harder than the UK national average?
The UK baseline average is approximately 200 PPM. At 140 PPM, water in outcode SY21 is 30% softer than the national benchmark.
Q: What dishwasher salt setting is recommended for SY21?
For Bosch, Siemens, and Neff dishwashers in outcode SY21 (140 PPM), the recommended softener setting is H02 – H03.
Q: Who manages the municipal water supply in outcode SY21?
Public tap water infrastructure across all 5 sectors in outcode SY21 is distributed and monitored by Hafren Dyfrdwy.
All Postcode Sectors in SY21
Select a postcode sector below to view exact water softener salt settings, limescale protection guides, and appliance recommendations.