UK Water Quality Report • 2026 Data

Water Hardness in GY9

Water supply analysis across 1 postcode sectors in GY9 (Guernsey Water).

Outcode Avg Hardness140 PPMModerately Hard Water
Regional Quality Overview

Water Supply Analysis: Outcode GY9

For residents and businesses in outcode GY9, understanding local water chemistry is essential for appliance longevity and limescale prevention. Our environmental data shows that GY9 averages 140 PPM in mineral content, falling into the Moderately Hard Water classification.

Water chemistry can fluctuate across supply zones in GY9. The lowest mineral concentration is recorded in sector GY9 3 at 140 PPM, whereas sector GY9 3 experiences higher mineral levels reaching 140 PPM.

Due to the moderately hard water (140 PPM) in GY9, 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 H01) 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 GY9

Lowest mineral concentration

Softest
Sector GY9 3228 Postcodes • Slightly Hard
140 PPM9.8 °Clark

Hardest Sector in GY9

Highest mineral concentration

Highest Hardness
Sector GY9 3228 Postcodes • Slightly Hard
140 PPM9.8 °Clark

All Postcode Sectors in GY9

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