County Durham · North East

Is Durham water hard or soft?

Moderately Hard at 126 ppm · 9 postcode districts

  • Supplier Northumbrian Water
  • County County Durham
  • Postcodes 9
Area average
126
ppm CaCO₃
Moderately Hard
Soft
Moderate
Hard
Very hard
0100200300400+

The average water hardness in Durham is 126 ppm, classified as moderately hard. Durham is served by Northumbrian Water, covering 9 postcode districts across County Durham in the North East region.

Hardness varies across the area — see the table below for a breakdown by postcode district.

By postcode

Water Hardness by Postcode in Durham

Sorted by hardness — tap a postcode for full details.

Postcode Water Company Hardness PPM Level
DH7 Northumbrian Water
150
150 ppm Moderately Hard
DH6 Northumbrian Water
149
149 ppm Moderately Hard
DH5 Northumbrian Water
148
148 ppm Moderately Hard
DH4 Northumbrian Water
147
147 ppm Moderately Hard
DH3 Northumbrian Water
146
146 ppm Moderately Hard
DH2 Northumbrian Water
145
145 ppm Moderately Hard
DH1 Northumbrian Water
144
144 ppm Moderately Hard
DH9 Northumbrian Water
51
51 ppm Soft
DH8 Northumbrian Water
50
50 ppm Soft
Suppliers

Water Companies Serving Durham

Tap for full coverage area and hardness data.

Northumbrian Water

101 ppm Slightly Hard

Water Hardness Guides

Learn more about water hardness and how to manage it.

What Is Water Hardness? Effects Solutions Water Softeners Limescale Removal

Test Your Water in Durham

At 126 ppm, your water is moderately hard. A home testing kit lets you verify the exact hardness and check for other contaminants.

SJ WAVE 16-in-1 Water Testing Kit

From ~£10

Quick home water test strips — checks hardness, pH, chlorine, lead, and 12 other parameters. Results in 60 seconds. 100 strips per pack.

View on Amazon

Get Durham Water Updates

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