Berkshire · South East

Is Iver water hard or soft?

Hard at 291 ppm · 10 postcode districts

  • Supplier Thames Water
  • County Berkshire
  • Postcodes 10
Area average
291
ppm CaCO₃
Hard
Soft
Moderate
Hard
Very hard
0100200300400+

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The average water hardness in Iver is 291 ppm, classified as hard. Iver is served by Thames Water, covering 10 postcode districts across Berkshire in the South East region.

Hardness varies across the area — see the table below for a breakdown by postcode district. SL3 has the hardest water at 350 ppm, while SL4 is the softest at 250 ppm.

By postcode

Water Hardness by Postcode in Iver

Sorted by hardness — tap a postcode for full details.

Postcode Water Company Hardness PPM Level
SL3 Thames Water
350
350 ppm Very Hard
SL2 Thames Water
349
349 ppm Very Hard
SL1 Thames Water
348
348 ppm Very Hard
SL0 Thames Water
347
347 ppm Very Hard
SL9 Thames Water
255
255 ppm Hard
SL8 Thames Water
254
254 ppm Hard
SL7 Thames Water
253
253 ppm Hard
SL6 Thames Water
252
252 ppm Hard
SL5 Thames Water
251
251 ppm Hard
SL4 Thames Water
250
250 ppm Hard
Suppliers

Water Companies Serving Iver

Tap for full coverage area and hardness data.

Thames Water

302 ppm Very Hard

Water Hardness Guides

Learn more about water hardness and how to manage it.

What Is Water Hardness? Effects Solutions Water Softeners Limescale Removal
Recommended

Products for Iver

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.

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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.

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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.

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FAQ

Common questions about Iver water

Is Iver water hard or soft?
Iver is classified as hard, averaging 291 ppm across 10 postcode districts. Expect visible limescale on kettles and taps within weeks at this level.
Which postcode in Iver has the hardest water?
SL3 has the hardest water in Iver at 350 ppm, while SL4 is the softest at 250 ppm. See the full table above for every district.
Which water company supplies Iver?
Iver is supplied by Thames Water, covering 10 postcode districts across Berkshire.
Is tap water in Iver safe to drink?
Yes. All tap water in Iver meets UK drinking water standards. Hardness affects taste and limescale buildup but not safety.
Do I need a water softener in Iver?
At 291 ppm, many households in Iver notice limescale in kettles and showerheads within weeks. A shower filter is the cheapest first step; a whole-house softener gives the most complete protection.
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