UK Water Quality Report • 2026 Data

Water Hardness in SO51

Water supply analysis across 7 postcode sectors in SO51 (Southern Water).

Outcode Avg Hardness245.7 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode SO51

Analyzing water quality disclosures across all 7 postcode sectors in outcode SO51 reveals an average water hardness of 245.7 PPM (Hard Water). Public water supply across this area is managed by Southern Water, responsible for treating and delivering water to residential households.

Water chemistry can fluctuate across supply zones in SO51. The lowest mineral concentration is recorded in sector SO51 6 at 40 PPM, whereas sector SO51 9 experiences higher mineral levels reaching 280 PPM.

Due to the hard water (245.7 PPM) in SO51, 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 SO51

Lowest mineral concentration

Softest
Sector SO51 6148 Postcodes • Soft
40 PPM2.8 °Clark

Hardest Sector in SO51

Highest mineral concentration

Highest Hardness
Sector SO51 963 Postcodes • Hard
280 PPM19.6 °Clark

All Postcode Sectors in SO51

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