UK Water Quality Report • 2026 Data

Water Hardness in DL3

Water supply analysis across 5 postcode sectors in DL3 (Northumbrian Water).

Outcode Avg Hardness130 PPMModerately Hard Water
Regional Quality Overview

Water Supply Analysis: Outcode DL3

Analyzing water quality disclosures across all 5 postcode sectors in outcode DL3 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 DL3. The lowest mineral concentration is recorded in sector DL3 0 at 130 PPM, whereas sector DL3 9 experiences higher mineral levels reaching 130 PPM.

Due to the moderately hard water (130 PPM) in DL3, 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 DL3

Lowest mineral concentration

Softest
Sector DL3 0316 Postcodes • Moderately Soft
130 PPM9.1 °Clark

Hardest Sector in DL3

Highest mineral concentration

Highest Hardness
Sector DL3 9262 Postcodes • Moderately Soft
130 PPM9.1 °Clark

All Postcode Sectors in DL3

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