UK Water Quality Report • 2026 Data

Water Hardness in PO1

Water supply analysis across 6 postcode sectors in PO1 (Portsmouth Water).

Outcode Avg Hardness250 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode PO1

For residents and businesses in outcode PO1, understanding local water chemistry is essential for appliance longevity and limescale prevention. Our environmental data shows that PO1 averages 250 PPM in mineral content, falling into the Hard Water classification.

Water chemistry can fluctuate across supply zones in PO1. The lowest mineral concentration is recorded in sector PO1 1 at 250 PPM, whereas sector PO1 9 experiences higher mineral levels reaching 250 PPM.

Due to the hard water (250 PPM) in PO1, 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 PO1

Lowest mineral concentration

Softest
Sector PO1 1145 Postcodes • Hard
250 PPM17.5 °Clark

Hardest Sector in PO1

Highest mineral concentration

Highest Hardness
Sector PO1 960 Postcodes • Hard
250 PPM17.5 °Clark

All Postcode Sectors in PO1

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