WaterWater Hardness in Darlington
County Durham, North East • 17 postcode districts
Slightly Hard
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.
Water Hardness by Postcode in Darlington
| Postcode | Water Company | Hardness | PPM | Level |
|---|---|---|---|---|
| DL17 | Northumbrian Water | 122 ppm | Moderately Hard | |
| DL16 | Northumbrian Water | 121 ppm | Moderately Hard | |
| DL15 | Northumbrian Water | 120 ppm | Slightly Hard | |
| DL14 | Northumbrian Water | 119 ppm | Slightly Hard | |
| DL13 | Northumbrian Water | 118 ppm | Slightly Hard | |
| DL12 | Northumbrian Water | 117 ppm | Slightly Hard | |
| DL11 | Northumbrian Water | 116 ppm | Slightly Hard | |
| DL10 | Northumbrian Water | 115 ppm | Slightly Hard | |
| DL9 | Northumbrian Water | 82 ppm | Slightly Hard | |
| DL8 | Northumbrian Water | 81 ppm | Slightly Hard | |
| DL7 | Northumbrian Water | 80 ppm | Slightly Hard | |
| DL6 | Northumbrian Water | 79 ppm | Slightly Hard | |
| DL5 | Northumbrian Water | 78 ppm | Slightly Hard | |
| DL4 | Northumbrian Water | 77 ppm | Slightly Hard | |
| DL3 | Northumbrian Water | 76 ppm | Slightly Hard | |
| DL2 | Northumbrian Water | 75 ppm | Slightly Hard | |
| DL1 | Northumbrian Water | 74 ppm | Slightly Hard |
Water Companies Serving Darlington
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