UK region

Water hardness in North West

Average 90 ppm across 270 postcode districts — classified as slightly hard.

  • Range 34–244 ppm
  • Counties 5
  • Suppliers Severn Trent Water, United Utilities
Regional average
90
ppm CaCO₃
Slightly Hard
Soft
Moderate
Hard
Very hard
0100200300400+
90
Avg ppm
34
Min ppm
244
Max ppm
270
Postcodes

Water Hardness Across North West

The average water hardness in the North West region is 90 ppm, classified as slightly hard. Across 270 postcode districts, hardness ranges from 34 ppm to 244 ppm.

The region is served by Severn Trent Water, United Utilities. Water hardness varies by county — see the breakdown below or check your specific postcode.

By county

Counties in North West

Sorted by hardness — see how your county compares.

County Hardness PPM Level Postcodes
Cumbria
205
205 ppm Hard 28
Lancashire
87
87 ppm Slightly Hard 55
Greater Manchester
77
77 ppm Slightly Hard 76
Merseyside
73
73 ppm Slightly Hard 40
Cheshire
71
71 ppm Slightly Hard 71
Suppliers

Water Companies in North West

Tap on a company for full coverage area and hardness data.

Severn Trent Water

222 ppm Hard

United Utilities

77 ppm Slightly Hard

Hard Water Guides

Learn more about water hardness and how to manage it.

What Is Water Hardness? Hard Water Effects Solutions
FAQ

Common questions about North West water

Is tap water in North West safe to drink?
Yes. All tap water in North West meets UK drinking water standards. Hardness affects taste and limescale buildup but not safety.
Why is water in North West slightly hard?
Water hardness in North West depends on the geology — chalk and limestone aquifers dissolve calcium and magnesium into the supply, making it harder. Areas with sandstone or granite tend to be softer.
Does hard water affect boilers in North West?
Over time, limescale acts as an insulator in heat exchangers, reducing efficiency by a few percentage points each year if untreated. A water softener can help protect your boiler.
What's the average water hardness in North West?
The average water hardness across North West is 90 ppm (parts per million), classified as slightly hard. It ranges from 34 ppm to 244 ppm across 270 postcode districts.

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