UK Water Quality Report • 2026 Data

Water Hardness in CT3

Water supply analysis across 4 postcode sectors in CT3 (Southern Water).

Outcode Avg Hardness280 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode CT3

For residents and businesses in outcode CT3, understanding local water chemistry is essential for appliance longevity and limescale prevention. Our environmental data shows that CT3 averages 280 PPM in mineral content, falling into the Hard Water classification.

Water chemistry can fluctuate across supply zones in CT3. The lowest mineral concentration is recorded in sector CT3 4 at 270 PPM, whereas sector CT3 3 experiences higher mineral levels reaching 290 PPM.

Due to the hard water (280 PPM) in CT3, 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 CT3

Lowest mineral concentration

Softest
Sector CT3 4164 Postcodes • Hard
270 PPM18.9 °Clark

Hardest Sector in CT3

Highest mineral concentration

Highest Hardness
Sector CT3 3183 Postcodes • Hard
290 PPM20.3 °Clark

All Postcode Sectors in CT3

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