ph effects on water
Not only does the pH of a stream affect organisms living in the water, a changing pH in a stream can be an indicator of increasing pollution or some other environmental factor. pH: Definition and measurement units. pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
If water has a higher proportion of hydrogen ions, it is acidic and has a pH less than 7. If it has a higher number of hydroxyl ions, then it is alkaline and has a pH of greater than 7. But water doesn't naturally exist without other mineral ions being present.