UK Water Quality Report • 2026 Data

Water Hardness in CO11

Water supply analysis across 3 postcode sectors in CO11 (Anglian Water).

Outcode Avg Hardness296.7 PPMHard Water
Regional Quality Overview

Water Supply Analysis: Outcode CO11

For residents and businesses in outcode CO11, understanding local water chemistry is essential for appliance longevity and limescale prevention. Our environmental data shows that CO11 averages 296.7 PPM in mineral content, falling into the Hard Water classification.

Water chemistry can fluctuate across supply zones in CO11. The lowest mineral concentration is recorded in sector CO11 2 at 290 PPM, whereas sector CO11 1 experiences higher mineral levels reaching 310 PPM.

Due to the hard water (296.7 PPM) in CO11, 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 CO11

Lowest mineral concentration

Softest
Sector CO11 2304 Postcodes • Hard
290 PPM20.3 °Clark

Hardest Sector in CO11

Highest mineral concentration

Highest Hardness
Sector CO11 1266 Postcodes • Very Hard
310 PPM21.7 °Clark

All Postcode Sectors in CO11

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