UK Water Quality Report • 2026 Data

Water Hardness in TN9

Water supply analysis across 3 postcode sectors in TN9 (South East Water).

Outcode Avg Hardness270 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode TN9

Analyzing water quality disclosures across all 3 postcode sectors in outcode TN9 reveals an average water hardness of 270 PPM (Hard Water). Public water supply across this area is managed by South East Water, responsible for treating and delivering water to residential households.

Water chemistry can fluctuate across supply zones in TN9. The lowest mineral concentration is recorded in sector TN9 1 at 270 PPM, whereas sector TN9 9 experiences higher mineral levels reaching 270 PPM.

Due to the hard water (270 PPM) in TN9, 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 TN9

Lowest mineral concentration

Softest
Sector TN9 1236 Postcodes • Hard
270 PPM18.9 °Clark

Hardest Sector in TN9

Highest mineral concentration

Highest Hardness
Sector TN9 959 Postcodes • Hard
270 PPM18.9 °Clark

All Postcode Sectors in TN9

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