UK Water Quality Report • 2026 Data

Water Hardness in WD7

Water supply analysis across 4 postcode sectors in WD7 (Affinity Water).

Outcode Avg Hardness290 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode WD7

Analyzing water quality disclosures across all 4 postcode sectors in outcode WD7 reveals an average water hardness of 290 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 WD7. The lowest mineral concentration is recorded in sector WD7 0 at 290 PPM, whereas sector WD7 9 experiences higher mineral levels reaching 290 PPM.

Due to the hard water (290 PPM) in WD7, 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 WD7

Lowest mineral concentration

Softest
Sector WD7 015 Postcodes • Hard
290 PPM20.3 °Clark

Hardest Sector in WD7

Highest mineral concentration

Highest Hardness
Sector WD7 9137 Postcodes • Hard
290 PPM20.3 °Clark

All Postcode Sectors in WD7

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