Parameter

Unit

Long rainy season

Long dry season

WHO standards (2011)

Min

Max

Avg

σ

CV(%)

Min

Max

Moy

σ

CV(%)

${\text{HCO}}_3^{-}$

(mg/L)

66.50

495.17

278.46

137.68

49.44

68.52

476.57

258.83

120.68

46.62

-

${\text{SO}}_4^{2-}$

(mg/L)

1.00

77.20

10.25

21.91

213.76

1.00

76.25

9.26

19.42

209.72

<250

Cl⁻

(mg/L)

0.44

122.48

12.40

28.89

232.98

0.83

119.70

13.07

27.98

214.08

<250

${\text{NO}}_3^{-}$

(mg/L)

0.06

330.88

22.36

79.94

357.51

0.11

318.37

22.33

76.69

343.44

≤50

${\text{NO}}_2^{-}$

(mg/L)

0.05

0.48

0.08

0.10

125

0.05

0.44

0.08

0.09

112.5

≥3

${\text{PO}}_4^{3-}$

(mg/L)

0.02

0.12

0.05

0.02

40

0.02

0.12

0.03

0.03

100

≤5

F⁻

(mg/L)

0.10

0.40

0.14

0.09

64.28

0.12

0.14

0.08

0.07

87.50

<5

${\text{NH}}_4^{+}$

(mg/L)

0.02

0.32

0.07

0.07

100

0.10

0.20

0.12

0.04

33.33

≤1.5

Ca²⁺

(mg/L)

12.00

142.40

51.74

30.82

59.57

11.50

138.50

48.15

30.00

62.30

≤100

Mg²⁺

(mg/L)

7.17

71.14

25.22

16.19

64.19

6.98

74.00

25.70

16.77

65.25

≤50

Na⁺

(mg/L)

6.74

47.12

20.71

12.96

62.58

5.28

46.40

20.54

12.26

59.69

≤200

K⁺

(mg/L)

0.28

2.68

0.88

0.66

75

0.28

4.88

1.07

1.14

106.54

≤12