Freshwater - Numerical Definition

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.

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