BOD5 (mg/L)

${\text{NH}}_{\text{4}}^{+}$ (mg/L)

${\text{NO}}_{\text{2}}^{-}$ (µg/L)

${\text{PO}}_{\text{4}}^{\text{3}-}$ (µg/L)

Class limit

Characterization of organic pollution

Contamination levels in the dry season

25.5

0.383

80

200

Classes

1

4

2

3

2.5

Strong

Contamination levels in rainy season

37

0.215

18

20

Classes

1

4

3

4

3

moderate