UK Water Quality Report • 2026 Data

Water Hardness in DH1

Water supply analysis across 6 postcode sectors in DH1 (Northumbrian Water).

Outcode Avg Hardness130 PPMModerately Hard Water
Regional Quality Overview

Water Supply Analysis: Outcode DH1

Analyzing water quality disclosures across all 6 postcode sectors in outcode DH1 reveals an average water hardness of 130 PPM (Moderately Hard Water). Public water supply across this area is managed by Northumbrian Water, responsible for treating and delivering water to residential households.

Water chemistry can fluctuate across supply zones in DH1. The lowest mineral concentration is recorded in sector DH1 1 at 130 PPM, whereas sector DH1 9 experiences higher mineral levels reaching 130 PPM.

Due to the moderately hard water (130 PPM) in DH1, 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 DH1

Lowest mineral concentration

Softest
Sector DH1 1226 Postcodes • Moderately Soft
130 PPM9.1 °Clark

Hardest Sector in DH1

Highest mineral concentration

Highest Hardness
Sector DH1 961 Postcodes • Moderately Soft
130 PPM9.1 °Clark

All Postcode Sectors in DH1

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