UK Water Quality Report • 2026 Data

Water Hardness in SP10

Water supply analysis across 6 postcode sectors in SP10 (Southern Water).

Outcode Avg Hardness280 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode SP10

Looking for water hardness metrics in SP10? Water supplied by Southern Water in this outcode registers a baseline average of 280 PPM across 6 distinct postcode sectors.

Water chemistry can fluctuate across supply zones in SP10. The lowest mineral concentration is recorded in sector SP10 1 at 280 PPM, whereas sector SP10 9 experiences higher mineral levels reaching 280 PPM.

Due to the hard water (280 PPM) in SP10, 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 SP10

Lowest mineral concentration

Softest
Sector SP10 1155 Postcodes • Hard
280 PPM19.6 °Clark

Hardest Sector in SP10

Highest mineral concentration

Highest Hardness
Sector SP10 930 Postcodes • Hard
280 PPM19.6 °Clark

All Postcode Sectors in SP10

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