UK Water Quality Report • 2026 Data

Water Hardness in ST7

Water supply analysis across 6 postcode sectors in ST7 (Severn Trent Water).

Outcode Avg Hardness121.7 PPMModerately Hard Water
Regional Quality Overview

Water Supply Analysis: Outcode ST7

Analyzing water quality disclosures across all 6 postcode sectors in outcode ST7 reveals an average water hardness of 121.7 PPM (Moderately Hard Water). Public water supply across this area is managed by Severn Trent Water, responsible for treating and delivering water to residential households.

Water chemistry can fluctuate across supply zones in ST7. The lowest mineral concentration is recorded in sector ST7 2 at 45 PPM, whereas sector ST7 9 experiences higher mineral levels reaching 160 PPM.

Due to the moderately hard water (121.7 PPM) in ST7, 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 H02) 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 ST7

Lowest mineral concentration

Softest
Sector ST7 2361 Postcodes • Soft
45 PPM3.2 °Clark

Hardest Sector in ST7

Highest mineral concentration

Highest Hardness
Sector ST7 95 Postcodes • Moderately Hard
160 PPM11.2 °Clark

All Postcode Sectors in ST7

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