Water hardness

CV5 Coventry

Harder than the UK average. Expect visible limescale on kettles and taps.

At 257 ppm, Coventry sits among the UK's hardest water areas — compare it against the softest areas.

Hard 257 ppm West Midlands Severn Trent Water
Your reading
257
parts per million
Soft
Moderate
Hard
Very hard
0100200300400+

What this means for your home

Based on 257 ppm in Coventry (hard water).

  • Significant limescale buildup in kettles, pipes and boilers
  • Soap scum on shower screens and taps
  • Higher energy bills from scale in heating elements
  • Dry skin and dull hair after washing
  • White residue on dishes and glassware
Heat loss
8%
Moderate scaling
Softener salt
£15–25
per year
Worth it?
Yes
at 257 ppm
Suggested for hard water
Whole-house water softener
Best long-term protection for boilers and pipes.
From £600 installed
Shower head filter
A simple first step for limescale on tiles and glass.
From £25
Filter jug or under-sink
Improves taste and reduces kettle scale.
From £20
Softening

Should you soften the water in Coventry?

A verdict and running-cost estimate based on CV5's 257 ppm reading, for a typical 4-person household.

Softener recommended

Water is hard to very hard, so appliance, scale and soap savings typically pay back a softener within a few years.

Recommended size
24k
grain capacity, regenerates ~every 10.4 days
Salt running cost
£15–25
per year (~53 kg salt)
Limescale
8%
est. heater efficiency loss. Moderate scaling
Soap saving
Moderate
Noticeable saving: soaps lather more easily, cutting detergent use.

Appliance impact at 257 ppm: noticeable: boiler/dishwasher life cut without descaling. Sized for a 4-person home; regenerates roughly every 10 days (estimate). Figures are conservative estimates and vary with household size and usage.

Water quality details

Hardness data for CV5

Sourced from Severn Trent Water's published water-quality reports and public records.

Hardness measurements

Parts per million (ppm CaCO₃)257
Degrees Clark (°Clark)18
Degrees French (°fH)25.7
Degrees German (°dH)14.4
Calcium (mg/L Ca²⁺)103

Supplier and area

Water supplier Severn Trent Water
Region West Midlands
County West Midlands
Hardness band Hard
UK average 207 ppm
Visit Severn Trent Water page
Official source
Severn Trent Water water-hardness report

Enter your postcode and pick a timeframe to see your area's measured water quality including hardness, with a downloadable PDF report.

Nearby

Other areas near Coventry

CV4
Coventry
256ppm
Hard
CV6
Coventry
258ppm
Hard
CV7
Coventry
259ppm
Hard
FAQ

Common questions about CV5

What is the water hardness in CV5 Coventry?
The water in CV5 Coventry has a hardness level of 257 ppm (parts per million) calcium carbonate, classified as hard. This is 50 ppm above the UK national average of 207 ppm.
Which water company supplies CV5?
CV5 Coventry is supplied by Severn Trent Water. Severn Trent Water serves the West Midlands region.
Is the water in CV5 safe to drink?
Yes. Hard water at 257 ppm is safe to drink. Water hardness affects taste and can cause limescale, but it is not a health risk. In fact, hard water contains beneficial minerals like calcium and magnesium.
How can I reduce water hardness in CV5?
For hard water at 257 ppm, a whole-house water softener is the most effective solution. You can also use a jug filter for drinking water, descaling products for appliances, and a shower filter for better skin and hair.
What does 257 ppm water hardness mean?
257 ppm means there are 257 parts per million of calcium carbonate dissolved in the water. This is equivalent to 18 Clark degrees, 14.4 German degrees, or 25.7 French degrees. Water above 180 ppm is generally considered hard.
What size water softener do I need in CV5?
For a typical 4-person home at 257 ppm, a 24,000 grain softener is a sensible size. It would regenerate roughly every 10.4 days. Larger households or higher daily use need a bigger unit. These figures are conservative estimates.
How much does it cost to run a water softener in CV5?
At 257 ppm, expect to use about 53 kg of salt a year, costing roughly £15–£25/year. Water is hard to very hard, so appliance, scale and soap savings typically pay back a softener within a few years.

Fix hard water in Coventry

Enter your email and we will send the limescale fixes that actually work at 257 ppm, plus what to skip.

Check another postcode

Compare hardness across areas before moving or buying a softener.