UK Water Quality Report • 2026 Data

Water Hardness in CW3

Water supply analysis across 2 postcode sectors in CW3 (United Utilities).

Outcode Avg Hardness102.5 PPMModerately Hard Water
Regional Quality Overview

Water Supply Analysis: Outcode CW3

For residents and businesses in outcode CW3, understanding local water chemistry is essential for appliance longevity and limescale prevention. Our environmental data shows that CW3 averages 102.5 PPM in mineral content, falling into the Moderately Hard Water classification.

Water chemistry can fluctuate across supply zones in CW3. The lowest mineral concentration is recorded in sector CW3 0 at 45 PPM, whereas sector CW3 9 experiences higher mineral levels reaching 160 PPM.

Due to the moderately hard water (102.5 PPM) in CW3, 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 H02) 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 CW3

Lowest mineral concentration

Softest
Sector CW3 0121 Postcodes • Soft
45 PPM3.2 °Clark

Hardest Sector in CW3

Highest mineral concentration

Highest Hardness
Sector CW3 9227 Postcodes • Moderately Hard
160 PPM11.2 °Clark

All Postcode Sectors in CW3

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