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Tap Score is new. Every water company in the UK already publishes how hard or soft your water is, but they all report it differently — different formats, different timing, different levels of detail. TapCheck takes all of that published data and translates it into one national score that works the same way everywhere: your Tap Score.
A low score means softer water. A high score means harder water. Neither is better or worse — it just tells you what your water is like. Tap Score is a hardness index, not a water quality score.
Tap Score = hardness mg/L ÷ 4, rounded to nearest integer
Scale 0–131
| Band | mg/L CaCO₃ |
|---|---|
| Soft | 0–59 |
| Moderately Soft | 60–119 |
| Slightly Hard | 120–179 |
| Moderately Hard | 180–239 |
| Hard | 240–299 |
| Very Hard | 300+ |
Higher means harder (more dissolved minerals), not better or worse.
No. A higher Tap Score means harder water — more dissolved minerals (primarily calcium and magnesium). Neither hard nor soft water is better or worse in itself.
Your water company updated their published hardness figures for your supply zone. Tap Score is calculated directly from the published mg/L value, so any change in the source data flows through to your score.
You may be in different supply zones. Supply zones are geographic areas set by your water company, and neighbouring postcodes can fall in different zones with different source water.
Water companies publish hardness in mg/L CaCO₃. Tap Score converts that into a simpler scale (0–131) so you can remember your number and understand what it means at home.