UK Water Quality Report • 2026 Data

Water Hardness in EN11

Water supply analysis across 4 postcode sectors in EN11 (Thames Water).

Outcode Avg Hardness275 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode EN11

Looking for water hardness metrics in EN11? 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 EN11. The lowest mineral concentration is recorded in sector EN11 0 at 275 PPM, whereas sector EN11 9 experiences higher mineral levels reaching 275 PPM.

Due to the hard water (275 PPM) in EN11, 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 EN11

Lowest mineral concentration

Softest
Sector EN11 0192 Postcodes • Hard
275 PPM19.3 °Clark

Hardest Sector in EN11

Highest mineral concentration

Highest Hardness
Sector EN11 9182 Postcodes • Hard
275 PPM19.3 °Clark

All Postcode Sectors in EN11

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