UK Water Quality Report • 2026 Data

Water Hardness in DA15

Water supply analysis across 4 postcode sectors in DA15 (Thames Water).

Outcode Avg Hardness275 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode DA15

For residents and businesses in outcode DA15, understanding local water chemistry is essential for appliance longevity and limescale prevention. Our environmental data shows that DA15 averages 275 PPM in mineral content, falling into the Hard Water classification.

Water chemistry can fluctuate across supply zones in DA15. The lowest mineral concentration is recorded in sector DA15 0 at 275 PPM, whereas sector DA15 9 experiences higher mineral levels reaching 275 PPM.

Due to the hard water (275 PPM) in DA15, 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 DA15

Lowest mineral concentration

Softest
Sector DA15 012 Postcodes • Hard
275 PPM19.3 °Clark

Hardest Sector in DA15

Highest mineral concentration

Highest Hardness
Sector DA15 9135 Postcodes • Hard
275 PPM19.3 °Clark

All Postcode Sectors in DA15

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