Official Supplier Data: Severn Trent Water • DWI & BS 7593 Standards
Water Hardness in ST7
Official water quality verdict for outcode ST7: classified as Moderately Hard Water (121.7 PPM), supplied and treated by Severn Trent Water across 6 sectors.
Rating: Moderately Hard Water121.7 PPM • 8.5° ClarkSupplier: Severn Trent Water-39% below UK average
Outcode Mean Hardness121.7 PPM8.5° Clark • Moderately Hard Water12.2°fH • 6.8°dH
Outcode ST7 Household Water Quality Verdict & Practical Advice
Domestic tap water in outcode ST7 is officially classified as moderately hard water, averaging 121.7 PPM (mg/L CaCO₃) or 8.5° Clark, supplied and treated by Severn Trent Water across all 6 postcode sectors (1,356 postcodes). Readings range from 45 PPM (ST7 2) to 160 PPM (ST7 9), showing a local disparity of 115 PPM.
☕ 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.
Local Installer Quote Network
Protect Your Heating & Appliances in ST7 (121.7 PPM): Compare Local Specialists
Connect with certified local plumbers for limescale management and British Standard BS 7593 heating system protection in Severn Trent Water.
Verified Against British Standard BS 7593
WRAS-Approved Water Softeners
100% Free & No Obligation Quotes
vs. UK Benchmark-39% Softervs 200 PPM national average
Water hardness isn't identical across every street in ST7—there is a 115 PPM variance between neighborhoods. Residents in sector ST7 2 enjoy the softest water at 45 PPM, whereas taps in sector ST7 9 register the highest mineral load at 160 PPM. This localized disparity occurs because Severn Trent Water blends supplies from different boreholes, rivers, and storage reservoirs depending on elevation and seasonal demand.
Supplies across ST7 are managed by Severn Trent Water through a balanced mix of lowland river abstraction and regional storage reservoirs. Water hardness fluctuates moderately between wet winter periods and dry summer months, averaging 121.7 PPM across all 1,356 local postcodes under strict Drinking Water Inspectorate (DWI) compliance.
Estimated Annual Household Financial Impact
Limescale & Appliance Operating Costs in Outcode ST7
Based on 121.7 PPM mineral saturation (Moderately Hard Water), operating heating appliances across ST7's 1,356 households carries distinct annual economic consequences:
Q: What is the average water hardness in outcode ST7?
Tap water across outcode ST7 averages 121.7 PPM (mg/L), which equals 8.5° Clark, 12.2°fH, or 6.8°dH. It is officially classified as moderately hard water water supplied by Severn Trent Water.
Q: Is water in ST7 harder than the UK national average?
The UK baseline average is approximately 200 PPM. At 121.7 PPM, water in outcode ST7 is 39% softer than the national benchmark.
Q: What dishwasher salt setting is recommended for ST7?
For Bosch, Siemens, and Neff dishwashers in outcode ST7 (121.7 PPM), the recommended softener setting is H02 – H03.
Q: Who manages the municipal water supply in outcode ST7?
Public tap water infrastructure across all 6 sectors in outcode ST7 is distributed and monitored by Severn Trent Water.
All Postcode Sectors in ST7
Select a postcode sector below to view exact water softener salt settings, limescale protection guides, and appliance recommendations.