UK Water Quality Report • 2026 Data

Water Hardness in SN16

Water supply analysis across 3 postcode sectors in SN16 (Wessex Water).

Outcode Avg Hardness285 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode SN16

Analyzing water quality disclosures across all 3 postcode sectors in outcode SN16 reveals an average water hardness of 285 PPM (Hard Water). Public water supply across this area is managed by Wessex Water, responsible for treating and delivering water to residential households.

Water chemistry can fluctuate across supply zones in SN16. The lowest mineral concentration is recorded in sector SN16 1 at 275 PPM, whereas sector SN16 9 experiences higher mineral levels reaching 290 PPM.

Due to the hard water (285 PPM) in SN16, 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 SN16

Lowest mineral concentration

Softest
Sector SN16 15 Postcodes • Hard
275 PPM19.3 °Clark

Hardest Sector in SN16

Highest mineral concentration

Highest Hardness
Sector SN16 9305 Postcodes • Hard
290 PPM20.3 °Clark

All Postcode Sectors in SN16

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