Table 1 Classification of water quality according to CCME-WQI method39,58.
Parameter | Water quality index | Class | Interpretation |
|---|---|---|---|
CWQI | 0–44 | Poor | Water quality is almost always threatened or impaired; conditions usually depart from natural or desirable levels |
45–64 | Marginal | Water quality is frequently threatened or impaired; conditions often depart from natural or desirable levels. | |
65–79 | Fair | Water quality is usually protected but occasionally threatened or impaired; conditions sometimes depart from natural or desirable levels. | |
80–94 | Good | Water quality is protected with only a minor degree of threat or impairment; conditions rarely depart from natural or desirable levels. | |
95–100 | Excellent | Water quality is protected with a virtual absence of threat or impairment, conditions very close to natural or pristine levels. |
