UK Water Quality Report • 2026 Data

Water Hardness in SN15

Water supply analysis across 6 postcode sectors in SN15 (Wessex Water).

Outcode Avg Hardness287.5 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode SN15

Looking for water hardness metrics in SN15? Water supplied by Wessex Water in this outcode registers a baseline average of 287.5 PPM across 6 distinct postcode sectors.

Water chemistry can fluctuate across supply zones in SN15. The lowest mineral concentration is recorded in sector SN15 4 at 275 PPM, whereas sector SN15 9 experiences higher mineral levels reaching 290 PPM.

Due to the hard water (287.5 PPM) in SN15, 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 SN15

Lowest mineral concentration

Softest
Sector SN15 4257 Postcodes • Hard
275 PPM19.3 °Clark

Hardest Sector in SN15

Highest mineral concentration

Highest Hardness
Sector SN15 957 Postcodes • Hard
290 PPM20.3 °Clark

All Postcode Sectors in SN15

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