UK Water Quality Report • 2026 Data

Water Hardness in CT18

Water supply analysis across 2 postcode sectors in CT18 (Affinity Water).

Outcode Avg Hardness290 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode CT18

For residents and businesses in outcode CT18, understanding local water chemistry is essential for appliance longevity and limescale prevention. Our environmental data shows that CT18 averages 290 PPM in mineral content, falling into the Hard Water classification.

Water chemistry can fluctuate across supply zones in CT18. The lowest mineral concentration is recorded in sector CT18 7 at 290 PPM, whereas sector CT18 8 experiences higher mineral levels reaching 290 PPM.

Due to the hard water (290 PPM) in CT18, 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 CT18

Lowest mineral concentration

Softest
Sector CT18 7297 Postcodes • Hard
290 PPM20.3 °Clark

Hardest Sector in CT18

Highest mineral concentration

Highest Hardness
Sector CT18 8154 Postcodes • Hard
290 PPM20.3 °Clark

All Postcode Sectors in CT18

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