North East · County

Water hardness in County Durham

Average 107 ppm across 26 postcodes and 2 towns.

  • Range 50–150 ppm
  • Towns 2
  • Suppliers Northumbrian Water
County average
107
ppm CaCO₃
Slightly Hard
Soft
Moderate
Hard
Very hard
0100200300400+
107
Avg ppm
50
Min ppm
150
Max ppm
26
Postcodes

Water Hardness Across County Durham

The average water hardness in County Durham is 107 ppm, classified as slightly hard. Across 26 postcode districts in the North East region, hardness ranges from 50 ppm to 150 ppm.

County Durham is served by Northumbrian Water. With slightly hard water, limescale is unlikely to be a major concern in most homes.

By town

Towns in County Durham

Sorted by hardness — tap a town for full details.

Town Hardness PPM Level
Durham
126
126 ppm Moderately Hard
Darlington
97
97 ppm Slightly Hard
Suppliers

Water Companies in County Durham

Companies supplying water to this county.

Northumbrian Water

101 ppm Slightly Hard
All postcodes

Postcodes in County Durham

Every postcode district in the county, sorted by hardness.

Postcode Town Hardness PPM Level
DH7 Durham
150
150 ppm Moderately Hard
DH6 Durham
149
149 ppm Moderately Hard
DH5 Houghton Le Spring
148
148 ppm Moderately Hard
DH4 Houghton Le Spring
147
147 ppm Moderately Hard
DH3 Chester Le Street
146
146 ppm Moderately Hard
DH2 Chester Le Street
145
145 ppm Moderately Hard
DH1 Durham
144
144 ppm Moderately Hard
DL17 Ferryhill
122
122 ppm Moderately Hard
DL16 Spennymoor
121
121 ppm Moderately Hard
DL15 Crook
120
120 ppm Slightly Hard
DL14 Bishop Auckland
119
119 ppm Slightly Hard
DL13 Bishop Auckland
118
118 ppm Slightly Hard
DL12 Barnard Castle
117
117 ppm Slightly Hard
DL11 Richmond
116
116 ppm Slightly Hard
DL10 Richmond
115
115 ppm Slightly Hard
DL9 Catterick Garrison
82
82 ppm Slightly Hard
DL8 Bedale
81
81 ppm Slightly Hard
DL7 Northallerton
80
80 ppm Slightly Hard
DL6 Northallerton
79
79 ppm Slightly Hard
DL5 Newton Aycliffe
78
78 ppm Slightly Hard
DL4 Shildon
77
77 ppm Slightly Hard
DL3 Darlington
76
76 ppm Slightly Hard
DL2 Darlington
75
75 ppm Slightly Hard
DL1 Darlington
74
74 ppm Slightly Hard
DH9 Stanley
51
51 ppm Soft
DH8 Consett
50
50 ppm Soft

Hard Water Guides

Learn more about water hardness and how to manage it.

What Is Water Hardness? Hard Water Effects Solutions
All counties in North East · Hardest water areas · Softest water areas · Hard water solutions

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