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+

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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. DH7 has the hardest water at 150 ppm, while DH8 is the softest at 50 ppm.

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.

TESPERT 16-in-1 Water Testing Kit

From ~£10

Home water test strips that check hardness, pH, chlorine, lead, and 12 other parameters. Results in around 60 seconds. 125 strips per pack.

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