UK Water Quality Report • 2026 Data

Water Hardness in SG5

Water supply analysis across 5 postcode sectors in SG5 (Affinity Water).

Outcode Avg Hardness294 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode SG5

Analyzing water quality disclosures across all 5 postcode sectors in outcode SG5 reveals an average water hardness of 294 PPM (Hard Water). Public water supply across this area is managed by Affinity Water, responsible for treating and delivering water to residential households.

Water chemistry can fluctuate across supply zones in SG5. The lowest mineral concentration is recorded in sector SG5 1 at 290 PPM, whereas sector SG5 4 experiences higher mineral levels reaching 310 PPM.

Due to the hard water (294 PPM) in SG5, 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 H07 (Max Salt)) 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 SG5

Lowest mineral concentration

Softest
Sector SG5 1202 Postcodes • Hard
290 PPM20.3 °Clark

Hardest Sector in SG5

Highest mineral concentration

Highest Hardness
Sector SG5 4254 Postcodes • Very Hard
310 PPM21.7 °Clark

All Postcode Sectors in SG5

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