UK Water Quality Report • 2026 Data

Water Hardness in CM0

Water supply analysis across 2 postcode sectors in CM0 (Essex and Suffolk Water).

Outcode Avg Hardness320 PPMVery Hard Water
Regional Quality Overview

Water Supply Analysis: Outcode CM0

Analyzing water quality disclosures across all 2 postcode sectors in outcode CM0 reveals an average water hardness of 320 PPM (Very Hard Water). Public water supply across this area is managed by Essex and Suffolk Water, responsible for treating and delivering water to residential households.

Water chemistry can fluctuate across supply zones in CM0. The lowest mineral concentration is recorded in sector CM0 7 at 320 PPM, whereas sector CM0 8 experiences higher mineral levels reaching 320 PPM.

Due to the very hard water (320 PPM) in CM0, 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 CM0

Lowest mineral concentration

Softest
Sector CM0 7296 Postcodes • Very Hard
320 PPM22.4 °Clark

Hardest Sector in CM0

Highest mineral concentration

Highest Hardness
Sector CM0 8265 Postcodes • Very Hard
320 PPM22.4 °Clark

All Postcode Sectors in CM0

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