County Durham · North East

Is Darlington water hard or soft?

Slightly Hard at 97 ppm · 17 postcode districts

  • Supplier Northumbrian Water
  • County County Durham
  • Postcodes 17
Area average
97
ppm CaCO₃
Slightly Hard
Soft
Moderate
Hard
Very hard
0100200300400+

The average water hardness in Darlington is 97 ppm, classified as slightly hard. Darlington is served by Northumbrian Water, covering 17 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 Darlington

Sorted by hardness — tap a postcode for full details.

Postcode Water Company Hardness PPM Level
DL17 Northumbrian Water
122
122 ppm Moderately Hard
DL16 Northumbrian Water
121
121 ppm Moderately Hard
DL15 Northumbrian Water
120
120 ppm Slightly Hard
DL14 Northumbrian Water
119
119 ppm Slightly Hard
DL13 Northumbrian Water
118
118 ppm Slightly Hard
DL12 Northumbrian Water
117
117 ppm Slightly Hard
DL11 Northumbrian Water
116
116 ppm Slightly Hard
DL10 Northumbrian Water
115
115 ppm Slightly Hard
DL9 Northumbrian Water
82
82 ppm Slightly Hard
DL8 Northumbrian Water
81
81 ppm Slightly Hard
DL7 Northumbrian Water
80
80 ppm Slightly Hard
DL6 Northumbrian Water
79
79 ppm Slightly Hard
DL5 Northumbrian Water
78
78 ppm Slightly Hard
DL4 Northumbrian Water
77
77 ppm Slightly Hard
DL3 Northumbrian Water
76
76 ppm Slightly Hard
DL2 Northumbrian Water
75
75 ppm Slightly Hard
DL1 Northumbrian Water
74
74 ppm Slightly Hard
Suppliers

Water Companies Serving Darlington

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 Darlington

At 97 ppm, your water is slightly 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 Darlington Water Updates

Be notified when water companies in Darlington report changes to hardness levels.