| Class | Description | Stations | WQI | Type |
| Excellent | Waters in this category meet the quality criteria almost all the time. According to [37] , that water quality is protected with a virtual absence of threat or impairment, conditions very close to natural or pristine levels. According to Abrahao et al, class Excellent can only be obtained if all measurements are within objectives virtually all the time. This is the case for the stations below. | Tink3 | 12.01 | Borehole |
| Knmg2 | 13.52 | Borehole | ||
| Sof1 | 15.14 | Borehole | ||
| Tink2 | 17.66 | Borehole | ||
| Good | For waters in this class, concentrations rarely deviate from natural or desirable levels. Water quality is protected with only a minor degree of threat or impairment conditions rarely depart from natural or desirable levels. This is the case for the stations below. | Sof2 | 26.04 | Borehole |
| Knmg1 | 47.11 | Borehole | ||
| Medium | Concentrations may deviate from natural or acceptable (desirable) levels. Water quality is usually protected but occasionally threatened or impaired, conditions sometimes depart from natural or desirable levels. | Sab2 | 50.98 | Hand dug well |
| Msab | 66.07 | Borehole | ||
| Poor | Concentrations often deviate from natural or desirable levels. Water quality is frequently threatened or impaired, conditions often depart from natural or desirable levels. | Bant1 | 78.42 | Hand dug well |
| Sab1 | 98.56 | Hand dug well | ||
| Very poor | Concentrations generally deviate from desirable levels. Water is always threatened or impaired, conditions usually depart from natural or desirable levels. Those waters are unsuitable. | Bant2 | 185.81 | Borehole |
| Tink1 | 428.56 | Hand dug well |