Water hardness

NG31 Grantham

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

At 300 ppm, Grantham sits among the UK's hardest water areas — compare it against the softest areas.

Hard 300 ppm East Midlands Severn Trent Water

Your reading

300

parts per million

Soft

Moderate

Hard

Very hard

0100200300400+

What this means for your home

Based on 300 ppm in Grantham (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

12%

Heavy scaling

Softener salt

£17–30

per year

Worth it?

Yes

at 300 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 Grantham?

A verdict and running-cost estimate based on NG31's 300 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 8.9 days

Salt running cost

£17–30

per year (~62 kg salt)

Limescale

12%

est. heater efficiency loss. Heavy scaling

Soap saving

High

Large saving: many homes cut soap, shampoo and detergent use by up to half.

Appliance impact at 300 ppm: significant: elements fur up, expect earlier failures. Sized for a 4-person home; regenerates roughly every 9 days (estimate). Figures are conservative estimates and vary with household size and usage.

Recommended

Products for Grantham

Popular choices for households dealing with hard water.

Splendid Twin Tank Water Softener

From ~£400

Twin-tank electric softener sized for 1 to 7 bedroom homes. Removes limescale from pipes, boilers, and appliances and delivers continuous soft water, with metered regeneration to keep salt use low.

View on Amazon

Philips Shower Filter

From ~£30

Quick win for skin and hair in hard water areas. Reduces chlorine and limescale, fits standard shower hoses in minutes, no tools needed. Cartridge lasts around 6 months.

View on Amazon

BRITA Marella Water Filter Jug

From ~£20

UK's best-selling filter jug. Reduces limescale, chlorine, and metals for better-tasting tap water. Quick first step alongside a softener.

View on Amazon

Water quality details

Hardness data for NG31

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

Hardness measurements

Parts per million (ppm CaCO₃)	300
Degrees Clark (°Clark)	21
Degrees French (°fH)	30
Degrees German (°dH)	16.8
Calcium (mg/L Ca²⁺)	120

Supplier and area

Water supplier Severn Trent Water

Region East Midlands

County Nottinghamshire

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 Grantham

FAQ

Common questions about NG31

What is the water hardness in NG31 Grantham?

The water in NG31 Grantham has a hardness level of 300 ppm (parts per million) calcium carbonate, classified as hard. This is 93 ppm above the UK national average of 207 ppm.

Which water company supplies NG31?

NG31 Grantham is supplied by Severn Trent Water. Severn Trent Water serves the East Midlands region.

Is the water in NG31 safe to drink?

Yes. Hard water at 300 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 NG31?

For hard water at 300 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 300 ppm water hardness mean?

300 ppm means there are 300 parts per million of calcium carbonate dissolved in the water. This is equivalent to 21 Clark degrees, 16.8 German degrees, or 30 French degrees. Water above 180 ppm is generally considered hard.

What size water softener do I need in NG31?

For a typical 4-person home at 300 ppm, a 24,000 grain softener is a sensible size. It would regenerate roughly every 8.9 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 NG31?

At 300 ppm, expect to use about 62 kg of salt a year, costing roughly £17–£30/year. Water is hard to very hard, so appliance, scale and soap savings typically pay back a softener within a few years.

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