What is the water hardness in Slough?

Between 233 and 302 mg/L depending on the district, with a median of 287. The hardest measured district is SL8 at 302 mg/L and the softest is SL6 at 233. Figures come from water company drinking-water tests.

Do I need a water softener in Slough?

In most SL homes a softener pays for itself: at 287 mg/L kettles, boilers and showers scale up quickly. Check your own district first, because hardness varies from 233 to 302 within the area.

Is Slough a hard water area?

Yes. Tap water across the SL postcode area is very hard, the top band on the scale water companies use, with a median of 287 mg/L calcium carbonate. It ranges from 233 mg/L in SL6 to 302 mg/L in SL8, from 10 districts with their own water company reading.

Soft
Moderately soft
Slightly hard
Hard
Very hard

Hardness in mg/L as calcium carbonate, the scale UK water companies report in.

Hardness by SL district

Hardest first. Hard starts at 180 mg/L, very hard at 250.

District	Area	mg/L	Hardness
SL8	Buckinghamshire	302	very hard
SL2	Buckinghamshire	300	very hard
SL3	Slough	295	very hard
SL1	Slough	289	very hard
SL0	Buckinghamshire	289	very hard
SL9	Buckinghamshire	285	very hard
SL7	Buckinghamshire	274	very hard
SL5	Windsor and Maidenhead	272	very hard
SL4	Windsor and Maidenhead	269	very hard
SL6	Windsor and Maidenhead	233	hard

Softener quotes for Slough

At 287 mg/L most SL homes get their money back on a softener within a few years. Free quotes from installers covering your postcode, no obligation.

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Check your exact postcode

The area figure is a median. Your district can sit anywhere between 233 and 302 mg/L.

Nearby areas

Is Slough a hard water area?: Yes. The median hardness across SL postcode districts is 287 mg/L calcium carbonate, which is very hard. 100% of the 10 districts we hold readings for are hard or very hard (180 mg/L and above).
What is the water hardness in Slough?: Between 233 and 302 mg/L depending on the district, with a median of 287. The hardest measured district is SL8 at 302 mg/L and the softest is SL6 at 233. Figures come from water company drinking-water tests.
Do I need a water softener in Slough?: In most SL homes a softener pays for itself: at 287 mg/L kettles, boilers and showers scale up quickly. Check your own district first, because hardness varies from 233 to 302 within the area.

Hardness as mg/L calcium carbonate from water company drinking-water tests and postcode checkers. See the UK hardness map for every area.