UK Water Quality Report • 2026 Data

Water Hardness in RH12

Water supply analysis across 8 postcode sectors in RH12 (Southern Water).

Outcode Avg Hardness280 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode RH12

For residents and businesses in outcode RH12, understanding local water chemistry is essential for appliance longevity and limescale prevention. Our environmental data shows that RH12 averages 280 PPM in mineral content, falling into the Hard Water classification.

Water chemistry can fluctuate across supply zones in RH12. The lowest mineral concentration is recorded in sector RH12 0 at 280 PPM, whereas sector RH12 9 experiences higher mineral levels reaching 280 PPM.

Due to the hard water (280 PPM) in RH12, 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 RH12

Lowest mineral concentration

Softest
Sector RH12 059 Postcodes • Hard
280 PPM19.6 °Clark

Hardest Sector in RH12

Highest mineral concentration

Highest Hardness
Sector RH12 969 Postcodes • Hard
280 PPM19.6 °Clark

All Postcode Sectors in RH12

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