UK Water Quality Report • 2026 Data

Water Hardness in RH15

Water supply analysis across 4 postcode sectors in RH15 (South East Water).

Outcode Avg Hardness270 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode RH15

For residents and businesses in outcode RH15, understanding local water chemistry is essential for appliance longevity and limescale prevention. Our environmental data shows that RH15 averages 270 PPM in mineral content, falling into the Hard Water classification.

Water chemistry can fluctuate across supply zones in RH15. The lowest mineral concentration is recorded in sector RH15 0 at 270 PPM, whereas sector RH15 9 experiences higher mineral levels reaching 270 PPM.

Due to the hard water (270 PPM) in RH15, 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 RH15

Lowest mineral concentration

Softest
Sector RH15 0358 Postcodes • Hard
270 PPM18.9 °Clark

Hardest Sector in RH15

Highest mineral concentration

Highest Hardness
Sector RH15 9228 Postcodes • Hard
270 PPM18.9 °Clark

All Postcode Sectors in RH15

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