UK Water Quality Report • 2026 Data

Water Hardness in N1P

Water supply analysis across 3 postcode sectors in N1P (Thames Water).

Outcode Avg Hardness226.7 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode N1P

Analyzing water quality disclosures across all 3 postcode sectors in outcode N1P reveals an average water hardness of 226.7 PPM (Hard Water). Public water supply across this area is managed by Thames Water, responsible for treating and delivering water to residential households.

Water chemistry can fluctuate across supply zones in N1P. The lowest mineral concentration is recorded in sector N1P 3 at 130 PPM, whereas sector N1P 2 experiences higher mineral levels reaching 275 PPM.

Due to the hard water (226.7 PPM) in N1P, 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 N1P

Lowest mineral concentration

Softest
Sector N1P 3206 Postcodes • Moderately Soft
130 PPM9.1 °Clark

Hardest Sector in N1P

Highest mineral concentration

Highest Hardness
Sector N1P 2332 Postcodes • Hard
275 PPM19.3 °Clark

All Postcode Sectors in N1P

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