UK Water Quality Report • 2026 Data

Water Hardness in HP10

Water supply analysis across 3 postcode sectors in HP10 (Thames Water).

Outcode Avg Hardness275 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode HP10

Analyzing water quality disclosures across all 3 postcode sectors in outcode HP10 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 HP10. The lowest mineral concentration is recorded in sector HP10 0 at 275 PPM, whereas sector HP10 9 experiences higher mineral levels reaching 275 PPM.

Due to the hard water (275 PPM) in HP10, 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 HP10

Lowest mineral concentration

Softest
Sector HP10 0177 Postcodes • Hard
275 PPM19.3 °Clark

Hardest Sector in HP10

Highest mineral concentration

Highest Hardness
Sector HP10 9239 Postcodes • Hard
275 PPM19.3 °Clark

All Postcode Sectors in HP10

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