UK Water Quality Report • 2026 Data

Water Hardness in RM12

Water supply analysis across 4 postcode sectors in RM12 (Essex and Suffolk Water).

Outcode Avg Hardness320 PPMVery Hard Water
Regional Quality Overview

Water Supply Analysis: Outcode RM12

Analyzing water quality disclosures across all 4 postcode sectors in outcode RM12 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 RM12. The lowest mineral concentration is recorded in sector RM12 4 at 320 PPM, whereas sector RM12 9 experiences higher mineral levels reaching 320 PPM.

Due to the very hard water (320 PPM) in RM12, 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 RM12

Lowest mineral concentration

Softest
Sector RM12 4257 Postcodes • Very Hard
320 PPM22.4 °Clark

Hardest Sector in RM12

Highest mineral concentration

Highest Hardness
Sector RM12 921 Postcodes • Very Hard
320 PPM22.4 °Clark

All Postcode Sectors in RM12

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