UK Water Quality Report • 2026 Data

Water Hardness in W1F

Water supply analysis across 4 postcode sectors in W1F (Thames Water).

Outcode Avg Hardness275 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode W1F

Looking for water hardness metrics in W1F? Water supplied by Thames Water in this outcode registers a baseline average of 275 PPM across 4 distinct postcode sectors.

Water chemistry can fluctuate across supply zones in W1F. The lowest mineral concentration is recorded in sector W1F 0 at 275 PPM, whereas sector W1F 9 experiences higher mineral levels reaching 275 PPM.

Due to the hard water (275 PPM) in W1F, limescale build-up can occur on heating elements, shower heads, and boilers. Setting your dishwasher water softener to the correct level (e.g. Bosch setting H04) is strongly recommended to prevent cloudy glassware and internal scale accumulation. Review the individual postcode sectors below to get precise dishwasher salt settings and limescale recommendations.

Softest Sector in W1F

Lowest mineral concentration

Softest
Sector W1F 0180 Postcodes • Hard
275 PPM19.3 °Clark

Hardest Sector in W1F

Highest mineral concentration

Highest Hardness
Sector W1F 9183 Postcodes • Hard
275 PPM19.3 °Clark

All Postcode Sectors in W1F

Select a postcode sector below to view exact water softener salt settings, limescale protection guides, and appliance recommendations.