UK Water Quality Report • 2026 Data

Water Hardness in W9

Water supply analysis across 4 postcode sectors in W9 (Thames Water).

Outcode Avg Hardness275 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode W9

Analyzing water quality disclosures across all 4 postcode sectors in outcode W9 reveals an average water hardness of 275 PPM (Hard Water). Public water supply across this area is managed by Thames Water, responsible for treating and delivering water to residential households.

Water chemistry can fluctuate across supply zones in W9. The lowest mineral concentration is recorded in sector W9 1 at 275 PPM, whereas sector W9 4 experiences higher mineral levels reaching 275 PPM.

Due to the hard water (275 PPM) in W9, 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 W9

Lowest mineral concentration

Softest
Sector W9 1206 Postcodes • Hard
275 PPM19.3 °Clark

Hardest Sector in W9

Highest mineral concentration

Highest Hardness
Sector W9 431 Postcodes • Hard
275 PPM19.3 °Clark

All Postcode Sectors in W9

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