UK Water Quality Report • 2026 Data

Water Hardness in TW13

Water supply analysis across 5 postcode sectors in TW13 (Affinity Water).

Outcode Avg Hardness284 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode TW13

For residents and businesses in outcode TW13, understanding local water chemistry is essential for appliance longevity and limescale prevention. Our environmental data shows that TW13 averages 284 PPM in mineral content, falling into the Hard Water classification.

Water chemistry can fluctuate across supply zones in TW13. The lowest mineral concentration is recorded in sector TW13 5 at 275 PPM, whereas sector TW13 9 experiences higher mineral levels reaching 290 PPM.

Due to the hard water (284 PPM) in TW13, 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 TW13

Lowest mineral concentration

Softest
Sector TW13 5153 Postcodes • Hard
275 PPM19.3 °Clark

Hardest Sector in TW13

Highest mineral concentration

Highest Hardness
Sector TW13 912 Postcodes • Hard
290 PPM20.3 °Clark

All Postcode Sectors in TW13

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