The hydrosphere refers to all water on the earth's surface. Water quality improves with decreased pollution from human activity. Generally, good water:

• Has no odor, is tasteless, and visibly clear
• Has good conductivity, conductivity is not increased or decreased by any amount of pollutant
• Has a dissolved oxygen content greater than 6 mg/L
• Has a relatively neutral pH
• Should have low levels, if any, of suspended particulate matter (SPM)
• Has a low turbidity value, which measures the relative clarity of the water in units of FNU or NTU