Water Type

Total Dissolved Substances, TDS mg/L

Fresh water

less than 1000 mg/L

Brackish water

between 1000 and 5000 mg/L

Highly brackish water

5000 and 15,000 mg/L

Saline water

15,000 and 30,000 mg/L TDS

Seawater

between 30,000 and 40,000 mg/L TDS

Brines

between 40,000 and over 300,000 mg/L TDS