RANK | WQI VALUE | DESCRIPTION |
Excellent | 95 - 100 | Water quality very close to natural or pristine levels. |
Very Good | 89 - 94 | Water quality close to natural pristine levels. |
Good | 80 - 88 | Water quality condition rarely departs from natural or pristine levels. |
Fair | 65 - 79 | Water quality sometimes departs from natural or desirable levels. |
Marginal | 45 - 64 | Water quality conditions often depart from natural or desirable levels. |
Poor | 0 - 44 | Water quality conditions usually depart from natural or desirable levels. |