UK Water Quality Report • 2026 Data

Water Hardness in SE1P

Water supply analysis across 3 postcode sectors in SE1P (Thames Water).

Outcode Avg Hardness275 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode SE1P

Looking for water hardness metrics in SE1P? Water supplied by Thames Water in this outcode registers a baseline average of 275 PPM across 3 distinct postcode sectors.

Water chemistry can fluctuate across supply zones in SE1P. The lowest mineral concentration is recorded in sector SE1P 4 at 275 PPM, whereas sector SE1P 6 experiences higher mineral levels reaching 275 PPM.

Due to the hard water (275 PPM) in SE1P, 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 SE1P

Lowest mineral concentration

Softest
Sector SE1P 4344 Postcodes • Hard
275 PPM19.3 °Clark

Hardest Sector in SE1P

Highest mineral concentration

Highest Hardness
Sector SE1P 6243 Postcodes • Hard
275 PPM19.3 °Clark

All Postcode Sectors in SE1P

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