WaterIs Darlington Water Hard or Soft?
Slightly Hard at 97 ppm • County Durham, North East
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
Water Hardness Guides
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 ~£10Quick home water test strips — checks hardness, pH, chlorine, lead, and 12 other parameters. Results in 60 seconds. 100 strips per pack.
View on AmazonGet Water Hardness Updates
Be notified when your water company reports changes to hardness levels.