UK Water Quality Report • 2026 Data

Water Hardness in PO40

Water supply analysis across 2 postcode sectors in PO40 (Southern Water).

Outcode Avg Hardness280 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode PO40

For residents and businesses in outcode PO40, understanding local water chemistry is essential for appliance longevity and limescale prevention. Our environmental data shows that PO40 averages 280 PPM in mineral content, falling into the Hard Water classification.

Water chemistry can fluctuate across supply zones in PO40. The lowest mineral concentration is recorded in sector PO40 0 at 280 PPM, whereas sector PO40 9 experiences higher mineral levels reaching 280 PPM.

Due to the hard water (280 PPM) in PO40, 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 PO40

Lowest mineral concentration

Softest
Sector PO40 01 Postcodes • Hard
280 PPM19.6 °Clark

Hardest Sector in PO40

Highest mineral concentration

Highest Hardness
Sector PO40 9292 Postcodes • Hard
280 PPM19.6 °Clark

All Postcode Sectors in PO40

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