Tap Water in RH10
ZS524 — Southern Water
Tap water in ZS524, supplied by Southern Water, has the character of a blended surface and groundwater supply, with no dominant mineral signature. It’s soft water, low in dissolved minerals, with a total hardness of 68 mg/L as CaCO₃.
Mineral composition
| mg/L | |
|---|---|
| Calcium | awaiting data |
| Magnesium | awaiting data |
| Sodium | awaiting data |
| Sulfate | awaiting data |
| Chloride | awaiting data |
| Bicarbonate | awaiting data |
Additional info
| Hardness | 68 as CaCO₃ |
| Alkalinity | awaiting data |
| pH | awaiting data |
| Conductivity | awaiting data |
| Source | Southern Water |
| Data year | 2024 |
What this means
Kettle & appliances
At this level of hardness, limescale is essentially a non-issue. Kettles, boilers, and heating elements will stay clean without treatment.
Espresso
Soft water is forgiving on espresso machines (no scale risk) but can produce a thinner, more acidic shot. The low mineral content means less buffering, so bright and sour notes tend to dominate. That said, lighter roasts can shine here in ways they won’t in harder water.
Filter & pour-over
This is where soft water shows its range. A V60 or Chemex will produce a bright, clean, highly readable cup with clear origin character. Light and medium roasts tend to be at their most expressive. It can tip into sourness with very light roasts, but for most specialty filter coffee, this water is close to ideal.
Drinking & cooking
This water tastes clean and neutral. It lathers easily, rinses cleanly, and won’t leave mineral deposits on glassware or cookware.
Bicarbonate
Extremely high buffering that makes this water difficult to work with for any brewing or coffee application without significant dilution or acid treatment: mash pH will sit stubbornly high, extraction will be unbalanced, and espresso will taste flat and chalky with no discernible acidity.
Nearby areas
RH20
Your water is pumped from underground sources in the greensand at Haslingbourne
Southern Water
RH1
Outwood Supply Zone
SES Water
RH13
Your water is pumped from the Western Rother River.
Southern Water
RH14
Your water is pumped from underground sources in the greensand at Haslingbourne
Southern Water
RH15
Butlers Green
South East Water
RH16
Cuckfield
South East Water
Data sourced from Southern Water (2024). Looking for a specific address? Look up your full postcode for the most accurate result.