UK Water Quality Report • 2026 Data

Water Hardness in CW4

Water supply analysis across 2 postcode sectors in CW4 (United Utilities).

Outcode Avg Hardness45 PPMSoft Water
Regional Quality Overview

Water Supply Analysis: Outcode CW4

Looking for water hardness metrics in CW4? Water supplied by United Utilities in this outcode registers a baseline average of 45 PPM across 2 distinct postcode sectors.

Water chemistry can fluctuate across supply zones in CW4. The lowest mineral concentration is recorded in sector CW4 7 at 45 PPM, whereas sector CW4 8 experiences higher mineral levels reaching 45 PPM.

Since CW4 enjoys soft water (45 PPM), residents generally do not need dishwasher salt or heavy-duty limescale descalers. Standard detergent dosages are sufficient for laundry and dishwashing. Review the individual postcode sectors below to get precise dishwasher salt settings and limescale recommendations.

Softest Sector in CW4

Lowest mineral concentration

Softest
Sector CW4 7177 Postcodes • Soft
45 PPM3.2 °Clark

Hardest Sector in CW4

Highest mineral concentration

Highest Hardness
Sector CW4 8167 Postcodes • Soft
45 PPM3.2 °Clark

All Postcode Sectors in CW4

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