Is Plymouth Water Hard or Soft?

Slightly Hard at 91 ppm • Devon, South West

Slightly Hard

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.

Water Hardness by Postcode in Plymouth

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

Water Companies Serving Plymouth

South West Water

Average hardness: 80 ppm (Slightly Hard) • 129 postcodes served

Water Hardness Guides

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 Water Hardness Updates

Be notified when your water company reports changes to hardness levels.