UK Water Quality Report • 2026 Data

Water Hardness in EC4A

Water supply analysis across 4 postcode sectors in EC4A (Thames Water).

Outcode Avg Hardness275 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode EC4A

For residents and businesses in outcode EC4A, understanding local water chemistry is essential for appliance longevity and limescale prevention. Our environmental data shows that EC4A averages 275 PPM in mineral content, falling into the Hard Water classification.

Water chemistry can fluctuate across supply zones in EC4A. The lowest mineral concentration is recorded in sector EC4A 1 at 275 PPM, whereas sector EC4A 4 experiences higher mineral levels reaching 275 PPM.

Due to the hard water (275 PPM) in EC4A, 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 EC4A

Lowest mineral concentration

Softest
Sector EC4A 135 Postcodes • Hard
275 PPM19.3 °Clark

Hardest Sector in EC4A

Highest mineral concentration

Highest Hardness
Sector EC4A 417 Postcodes • Hard
275 PPM19.3 °Clark

All Postcode Sectors in EC4A

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