UK Water Quality Report • 2026 Data

Water Hardness in E9

Water supply analysis across 4 postcode sectors in E9 (Thames Water).

Outcode Avg Hardness275 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode E9

Analyzing water quality disclosures across all 4 postcode sectors in outcode E9 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 E9. The lowest mineral concentration is recorded in sector E9 5 at 275 PPM, whereas sector E9 9 experiences higher mineral levels reaching 275 PPM.

Due to the hard water (275 PPM) in E9, 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 E9

Lowest mineral concentration

Softest
Sector E9 5284 Postcodes • Hard
275 PPM19.3 °Clark

Hardest Sector in E9

Highest mineral concentration

Highest Hardness
Sector E9 913 Postcodes • Hard
275 PPM19.3 °Clark

All Postcode Sectors in E9

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