Devon · South West

Is Plymouth water hard or soft?

Slightly Hard at 91 ppm · 35 postcode districts

  • Supplier South West Water
  • County Devon
  • Postcodes 35
Area average
91
ppm CaCO₃
Slightly Hard
Soft
Moderate
Hard
Very hard
0100200300400+

The average water hardness in Plymouth is 91 ppm, classified as slightly hard. Plymouth is served by South West Water, covering 35 postcode districts across Devon in the South West region.

Hardness varies across the area — see the table below for a breakdown by postcode district.

By postcode

Water Hardness by Postcode in Plymouth

Sorted by hardness — tap a postcode for full details.

Postcode Water Company Hardness PPM Level
PL9 South West Water
138
138 ppm Moderately Hard
PL8 South West Water
137
137 ppm Moderately Hard
PL7 South West Water
136
136 ppm Moderately Hard
PL6 South West Water
135
135 ppm Moderately Hard
PL5 South West Water
134
134 ppm Moderately Hard
PL4 South West Water
133
133 ppm Moderately Hard
PL3 South West Water
132
132 ppm Moderately Hard
PL2 South West Water
131
131 ppm Moderately Hard
PL1 South West Water
130
130 ppm Moderately Hard
PL35 South West Water
115
115 ppm Slightly Hard
PL34 South West Water
114
114 ppm Slightly Hard
PL33 South West Water
113
113 ppm Slightly Hard
PL32 South West Water
112
112 ppm Slightly Hard
PL31 South West Water
111
111 ppm Slightly Hard
PL30 South West Water
110
110 ppm Slightly Hard
PL29 South West Water
86
86 ppm Slightly Hard
PL28 South West Water
85
85 ppm Slightly Hard
PL27 South West Water
84
84 ppm Slightly Hard
PL26 South West Water
83
83 ppm Slightly Hard
PL25 South West Water
82
82 ppm Slightly Hard
PL24 South West Water
81
81 ppm Slightly Hard
PL23 South West Water
80
80 ppm Slightly Hard
PL22 South West Water
79
79 ppm Slightly Hard
PL21 South West Water
78
78 ppm Slightly Hard
PL20 South West Water
77
77 ppm Slightly Hard
PL19 South West Water
53
53 ppm Soft
PL18 South West Water
52
52 ppm Soft
PL17 South West Water
51
51 ppm Soft
PL16 South West Water
50
50 ppm Soft
PL15 South West Water
49
49 ppm Soft
PL14 South West Water
48
48 ppm Soft
PL13 South West Water
47
47 ppm Soft
PL12 South West Water
46
46 ppm Soft
PL11 South West Water
45
45 ppm Soft
PL10 South West Water
44
44 ppm Soft
Suppliers

Water Companies Serving Plymouth

Tap for full coverage area and hardness data.

South West Water

80 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 Plymouth

At 91 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 Plymouth Water Updates

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