UK Water Quality Report • 2026 Data

Water Hardness in CH7

Water supply analysis across 7 postcode sectors in CH7 (Severn Trent / Hafren Dyfrdwy).

Outcode Avg Hardness148.6 PPMModerately Hard Water
Regional Quality Overview

Water Supply Analysis: Outcode CH7

Looking for water hardness metrics in CH7? Water supplied by Severn Trent / Hafren Dyfrdwy in this outcode registers a baseline average of 148.6 PPM across 7 distinct postcode sectors.

Water chemistry can fluctuate across supply zones in CH7. The lowest mineral concentration is recorded in sector CH7 4 at 140 PPM, whereas sector CH7 9 experiences higher mineral levels reaching 150 PPM.

Due to the moderately hard water (148.6 PPM) in CH7, 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 CH7

Lowest mineral concentration

Softest
Sector CH7 4245 Postcodes • Moderately Hard
140 PPM9.8 °Clark

Hardest Sector in CH7

Highest mineral concentration

Highest Hardness
Sector CH7 912 Postcodes • Moderately Hard
150 PPM10.5 °Clark

All Postcode Sectors in CH7

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