UK Water Quality Report • 2026 Data

Water Hardness in TN25

Water supply analysis across 4 postcode sectors in TN25 (South East Water).

Outcode Avg Hardness275 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode TN25

For residents and businesses in outcode TN25, understanding local water chemistry is essential for appliance longevity and limescale prevention. Our environmental data shows that TN25 averages 275 PPM in mineral content, falling into the Hard Water classification.

Water chemistry can fluctuate across supply zones in TN25. The lowest mineral concentration is recorded in sector TN25 4 at 270 PPM, whereas sector TN25 6 experiences higher mineral levels reaching 290 PPM.

Due to the hard water (275 PPM) in TN25, 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 TN25

Lowest mineral concentration

Softest
Sector TN25 4176 Postcodes • Hard
270 PPM18.9 °Clark

Hardest Sector in TN25

Highest mineral concentration

Highest Hardness
Sector TN25 6249 Postcodes • Hard
290 PPM20.3 °Clark

All Postcode Sectors in TN25

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