Is Truro Water Hard or Soft? Slightly Hard at 91 ppm

The average water hardness in Truro is 91 ppm, classified as slightly hard. Truro is served by South West Water, covering 23 postcode districts across Cornwall in the South West region.

Hardness varies across the area. See the table below for a breakdown by postcode district. TR27 has the hardest water at 109 ppm, while TR10 is the softest at 69 ppm.

By postcode

Water Hardness by Postcode in Truro

Sorted by hardness. Tap a postcode for full details.

Postcode	Water Company	Hardness	PPM	Level
TR27	South West Water	109	109 ppm	Slightly Hard
TR26	South West Water	108	108 ppm	Slightly Hard
TR9	South West Water	107	107 ppm	Slightly Hard
TR8	South West Water	106	106 ppm	Slightly Hard
TR7	South West Water	105	105 ppm	Slightly Hard
TR6	South West Water	104	104 ppm	Slightly Hard
TR21	South West Water	103	103 ppm	Slightly Hard
TR5	South West Water	103	103 ppm	Slightly Hard
TR20	South West Water	102	102 ppm	Slightly Hard
TR4	South West Water	102	102 ppm	Slightly Hard
TR3	South West Water	101	101 ppm	Slightly Hard
TR2	South West Water	100	100 ppm	Slightly Hard
TR1	South West Water	99	99 ppm	Slightly Hard
TR19	South West Water	78	78 ppm	Slightly Hard
TR18	South West Water	77	77 ppm	Slightly Hard
TR17	South West Water	76	76 ppm	Slightly Hard
TR16	South West Water	75	75 ppm	Slightly Hard
TR15	South West Water	74	74 ppm	Slightly Hard
TR14	South West Water	73	73 ppm	Slightly Hard
TR13	South West Water	72	72 ppm	Slightly Hard
TR12	South West Water	71	71 ppm	Slightly Hard
TR11	South West Water	70	70 ppm	Slightly Hard
TR10	South West Water	69	69 ppm	Slightly Hard

Suppliers

Water Companies Serving Truro

Tap for full coverage area and hardness data.

South West Water

80 ppm Slightly Hard

Each water company publishes its own hardness data, so you can cross-check the Truro figures here against the published hardness data from South West Water.

Test Your Water in Truro

At 91 ppm, your water is slightly hard. A home testing kit lets you verify the exact hardness and check for other contaminants.

TESPERT 16-in-1 Water Testing Kit

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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FAQ

Common questions about Truro water

Is Truro water hard or soft?

Truro is classified as slightly hard, averaging 91 ppm across 23 postcode districts. Limescale build-up is minimal at this level, though individual postcodes vary.

Which postcode in Truro has the hardest water?

TR27 has the hardest water in Truro at 109 ppm, while TR10 is the softest at 69 ppm. See the full table above for every district.

Which water company supplies Truro?

Truro is supplied by South West Water, covering 23 postcode districts across Cornwall.

Is tap water in Truro safe to drink?

Hardness is not a safety issue: the World Health Organization sets no health-based limit for water hardness, so hard and soft water are both fine to drink. Drinking water quality is regulated by the Drinking Water Inspectorate in England and Wales and the Drinking Water Quality Regulator in Scotland, and your water company publishes test results for your area.

Does Truro have any harder-water postcodes?

TR27 is the hardest district at 109 ppm (slightly hard), though most of Truro averages 91 ppm.