Parameters

Unit

Mean

Standard Deviation

Minimum

Maximum

Median

WHO Guideline 2011

Physico-chemical

pH

-

7.16

0.10

7

7.3

7.1

6.5 - 8.5

Turbidity

NTU

0.66

0.12

0.41

0.89

0.67

<5

Salinity

‰

0.32

0.04

0.21

0.38

0.33

1.2

Total Dissolved Solids (TDS)

mg/L

378.30

7.00

365.46

388.28

379.36

<1000

Chloride

65.92

3.37

62

74

65

<250

Hardness

139.60

5.35

132

155

138

<500

Sulphate ( ${\text{SO}}_4^{-}$ )

78.24

3.38

72

86

78

250

Nitrate ( ${\text{NO}}_3^{-}$ )

0.09

0.01

0.054

0.099

0.089

12

Metals

Arsenic (As)

mg/L

0.01

0.00

0

0.0094

0.0061

0.01

Copper (Cu)

0.75

0.07

0.64

0.85

0.75

0.2

Lead (Pb)

0.08*

0.01

0.045

0.099

0.085

<0.01

Iron (Fe)

0.32*

0.05

0.22

0.4

0.33

0.3

Zinc (Zn)

0.49

0.04

0.42

0.59

0.48

0.5

Calcium (Ca)

37.42

1.23

35.25

39.14

37.36

150

Magnesium (Mg)

10.76

0.81

9.33

12.36

10.69

100

Bacteriology

Total Coliform Count (TCC)

MPN/100mL

24.16

91.93

3

460

3

0

Total Faecal Coliform (TFC)

12.88

41.84

3

210

3

0

Total Faecal Streptococci (TFS)

3.16

0.80

3

7

3

0