Numerical Definition
Fresh water can be defined as water with less than 500 parts per million (ppm) of dissolved salts.
| Water salinity based on dissolved salts | |||
|---|---|---|---|
| Fresh water | Brackish water | Saline water | Brine |
| < 0.05% | 0.05% – 3% | 3% – 5% | > 5% |
Other sources give higher upper salinity limits for fresh water, e.g. 1000 ppm or 3000 ppm.
Read more about this topic: Freshwater
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