UK Water Quality Report • 2026 Data

Water Hardness in TN40

Water supply analysis across 3 postcode sectors in TN40 (South East Water).

Outcode Avg Hardness270 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode TN40

For residents and businesses in outcode TN40, understanding local water chemistry is essential for appliance longevity and limescale prevention. Our environmental data shows that TN40 averages 270 PPM in mineral content, falling into the Hard Water classification.

Water chemistry can fluctuate across supply zones in TN40. The lowest mineral concentration is recorded in sector TN40 1 at 270 PPM, whereas sector TN40 9 experiences higher mineral levels reaching 270 PPM.

Due to the hard water (270 PPM) in TN40, 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 TN40

Lowest mineral concentration

Softest
Sector TN40 1233 Postcodes • Hard
270 PPM18.9 °Clark

Hardest Sector in TN40

Highest mineral concentration

Highest Hardness
Sector TN40 946 Postcodes • Hard
270 PPM18.9 °Clark

All Postcode Sectors in TN40

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