Moderately HardSevern Trent WaterWest Midlands

Stoke-on-Trent Water Hardness Report

Official mineral water quality analysis, local catchment breakdown, appliance salt calibration, and postcode outcode directory for Stoke-on-Trent.

Average City Tap Water RatingUpdated 10 September 2025
165PPM (mg/L CaCO3)
Clark Degrees
11.5° Clark
French Scale
16.5°fH
German Scale
9.2°dH

Stoke-on-Trent has moderately hard tap water, averaging roughly 165 PPM. Severn Trent supplies the Potteries from a combination of Tittesworth Reservoir in the Staffordshire Moorlands and groundwater wells across the North Staffordshire coalfield and sandstone beds. Householders will notice light limescale crusting on kettle bases every couple of months, but it remains far less aggressive than in the south of England. Regular kettle descaling keeps appliances running smoothly.

17% softer than the UK national baseline (200 PPM)

Neighbourhood Hydro-Variance

Water hardness across Stoke-on-Trent varies by up to 60 PPM between different treatment zones and boreholes.

Softest District135 PPM
Tunstall & Burslem
Hardest District195 PPM
Longton & Trentham
Supplied by Severn Trent Water under Drinking Water Inspectorate (DWI) regulatory standards.
Local Installer Quote Network

Protect Your Heating & Appliances in ST (165 PPM): Compare Local Specialists

Connect with certified local plumbers for limescale management and British Standard BS 7593 heating system protection in Stoke-on-Trent.

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Which?-Style Practical Household Advice

Living with Stoke-on-Trent Tap Water: Essential Household Guide

Practical calibrations for kitchen appliances, heating systems, and personal care tailored specifically to Stoke-on-Trent's water profile.

Kettles & Hot Drinks

Every 2–3 months with white vinegar or food-grade citric acid crystals.

💡 Pro Tip: Buy food-grade citric acid powder (£5/kg) instead of chemical descaling tablets. One boiled tablespoon cleans the base in 5 minutes with zero lingering odor.
Dishwasher Salt Calibration

Level 2 or 3 (Medium). Keep salt reservoir filled to protect glassware from clouding.

⚙️ Recommended Dial Setting: Level 2–3 (refer to machine manual).
Boiler Efficiency & BS 7593

Mild scale drag (~4%–6% efficiency loss). Add an in-line electrolytic scale reducer and annual inhibitor dosing.

🛡️ Compliance: British Standard BS 7593 requires regular chemical inhibitor dosing and annual testing to prevent heat exchanger scale drag.
Bathing, Hair & Sensitive Skin

Moderate lathering. Rinses clean without heavy mineral curd residue.

🚿 Shower Screens: Use a rubber squeegee after each shower to prevent dissolved calcium from baking into the glass under hot steam.
Common Questions

Frequently Asked Questions about Stoke-on-Trent Tap Water

Is water hard in Stoke-on-Trent?
Stoke-on-Trent has moderately hard water (average 165 PPM). It is neither very soft nor aggressively hard, representing a balanced mineral profile.
What dishwasher setting should I use in Stoke-on-Trent?
Set your dishwasher water softener to Level 2 or 3. This balances salt usage while protecting your glassware from mineral hazing.
How often should I descale my kettle in Stoke?
Descaling every 8 to 12 weeks with white vinegar or citric acid is typically sufficient to remove the moderate mineral crust.
WaterHardness.uk Technical & Water Quality Research Team
Data sourced from Severn Trent Water compliance reports and Drinking Water Inspectorate (DWI) public records.