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

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