UK Water Quality Report • 2026 Data

Water Hardness in WC1H

Water supply analysis across 3 postcode sectors in WC1H (Thames Water).

Outcode Avg Hardness275 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode WC1H

Looking for water hardness metrics in WC1H? Water supplied by Thames Water in this outcode registers a baseline average of 275 PPM across 3 distinct postcode sectors.

Water chemistry can fluctuate across supply zones in WC1H. The lowest mineral concentration is recorded in sector WC1H 0 at 275 PPM, whereas sector WC1H 9 experiences higher mineral levels reaching 275 PPM.

Due to the hard water (275 PPM) in WC1H, 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 WC1H

Lowest mineral concentration

Softest
Sector WC1H 076 Postcodes • Hard
275 PPM19.3 °Clark

Hardest Sector in WC1H

Highest mineral concentration

Highest Hardness
Sector WC1H 9152 Postcodes • Hard
275 PPM19.3 °Clark

All Postcode Sectors in WC1H

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