Tap water in ME15 (Boxley): coffee, brewing suitability
Supplied by South East Water
Tap water in Boxley, supplied by South East Water, has the character of a chalk aquifer source, typical of southern and eastern England. It’s soft water, low in dissolved minerals, with a total hardness of 97 mg/L as CaCO₃. Bicarbonate is high at 329 mg/L: this water suits dark-roasted, milk-based coffee well, but will strip the acidity from lighter roasts and pour-over brewing.
Mineral composition
| mg/L | |
|---|---|
| Calcium | 96 |
| Magnesium | 3 |
| Sodium | 18 |
| Sulfate | 39 |
| Chloride | 36 |
| Bicarbonate | 329 |
Additional info
| Hardness | 97.2 as CaCO₃ |
| Alkalinity | 269.5 as CaCO₃ |
| pH | 7.6 |
| Conductivity | 505 µS/cm |
| Source | South East Water |
| Data year | 2025 |
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
Heavily buffered water that resists pH change substantially: suited only to the darkest, most roast-forward beer styles (and even then may need dilution), while espresso at this level will taste dull, chalky, and lacking definition, with almost all origin character neutralised by the alkalinity.
Get the best from your water
ME15 tap water works well for espresso, brewing, baking, and aquarium use with little or no adjustment. It has too much mineral content for tea and horticulture; a bottled water blend is the better route for those.
Nearby areas
ME1
Your water is pumped from underground sources in the chalk at Strood and Cuxton,
Southern Water
ME2
Your water is pumped from underground sources in the chalk at Strood and Cuxton,
Southern Water
ME3
Your water is pumped from underground sources in the chalk at Higham, Three Crut
Southern Water
ME4
Your water is pumped from underground sources in the chalk at Nashenden and Lut
Southern Water
ME5
Your water is pumped from underground sources in the chalk at Nashenden, Matts H
Southern Water
ME7
Your water is pumped from underground sources in the chalk at Nashenden, Matts H
Southern Water
Data sourced from South East Water (2025). Looking for a specific address? Look up your full postcode for the most accurate result.