Greater London · London

Is Dartford water hard or soft?

Hard at 289 ppm · 18 postcode districts

  • Supplier Thames Water
  • County Greater London
  • Postcodes 18
Area average
289
ppm CaCO₃
Hard
Soft
Moderate
Hard
Very hard
0100200300400+

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The average water hardness in Dartford is 289 ppm, classified as hard. Dartford is served by Thames Water, covering 18 postcode districts across Greater London in the London region.

Hardness varies across the area — see the table below for a breakdown by postcode district. DA9 has the hardest water at 323 ppm, while DA10 is the softest at 254 ppm.

By postcode

Water Hardness by Postcode in Dartford

Sorted by hardness — tap a postcode for full details.

Postcode Water Company Hardness PPM Level
DA9 Thames Water
323
323 ppm Very Hard
DA8 Thames Water
322
322 ppm Very Hard
DA7 Thames Water
321
321 ppm Very Hard
DA6 Thames Water
320
320 ppm Very Hard
DA5 Thames Water
319
319 ppm Very Hard
DA4 Thames Water
318
318 ppm Very Hard
DA3 Thames Water
317
317 ppm Very Hard
DA2 Thames Water
316
316 ppm Very Hard
DA1 Thames Water
315
315 ppm Very Hard
DA18 Thames Water
262
262 ppm Hard
DA17 Thames Water
261
261 ppm Hard
DA16 Thames Water
260
260 ppm Hard
DA15 Thames Water
259
259 ppm Hard
DA14 Thames Water
258
258 ppm Hard
DA13 Thames Water
257
257 ppm Hard
DA12 Thames Water
256
256 ppm Hard
DA11 Thames Water
255
255 ppm Hard
DA10 Thames Water
254
254 ppm Hard
Suppliers

Water Companies Serving Dartford

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 Dartford

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 Dartford water

Is Dartford water hard or soft?
Dartford is classified as hard, averaging 289 ppm across 18 postcode districts. Expect visible limescale on kettles and taps within weeks at this level.
Which postcode in Dartford has the hardest water?
DA9 has the hardest water in Dartford at 323 ppm, while DA10 is the softest at 254 ppm. See the full table above for every district.
Which water company supplies Dartford?
Dartford is supplied by Thames Water, covering 18 postcode districts across Greater London.
Is tap water in Dartford safe to drink?
Yes. All tap water in Dartford meets UK drinking water standards. Hardness affects taste and limescale buildup but not safety.
Do I need a water softener in Dartford?
At 289 ppm, many households in Dartford 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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