UK Water Quality Report • 2026 Data

Water Hardness in CB4

Water supply analysis across 4 postcode sectors in CB4 (Cambridge Water).

Outcode Avg Hardness315 PPMVery Hard Water
Regional Quality Overview

Water Supply Analysis: Outcode CB4

Looking for water hardness metrics in CB4? Water supplied by Cambridge Water in this outcode registers a baseline average of 315 PPM across 4 distinct postcode sectors.

Water chemistry can fluctuate across supply zones in CB4. The lowest mineral concentration is recorded in sector CB4 0 at 315 PPM, whereas sector CB4 3 experiences higher mineral levels reaching 315 PPM.

Due to the very hard water (315 PPM) in CB4, 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 H07 (Max Salt)) 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 CB4

Lowest mineral concentration

Softest
Sector CB4 049 Postcodes • Very Hard
315 PPM22 °Clark

Hardest Sector in CB4

Highest mineral concentration

Highest Hardness
Sector CB4 3228 Postcodes • Very Hard
315 PPM22 °Clark

All Postcode Sectors in CB4

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