Parameters (n = 40)

Sites

min.

max.

SD

Mean ± SE

CV (%)

P value for F test

Safari et al. [26]

Standard

[24]

Standard

[23]

pH

Bassa.PS-Ishaka1

5.77

5.91

0.04

5.82 ± 0.01

0.63

0.00*

6.03

5.5 - 8.5

6.5 - 8.5

Kanya.TC-Ishaka2

5.72

7.52

0.47

7.06 ± 0.07

6.61

BTS-Central1

5.60

6.39

0.27

5.84 ± 0.04

4.64

SAGSS-Central2

5.58

5.82

0.07

5.68 ± 0.01

1.26

Nyaka.TC

5.59

5.88

0.10

5.72 ± 0.02

1.67

Electrical Conductivity

(µS/cm)

Bassa.PS-Ishaka1

67.00

83.00

4.87

73.78 ± 0.77

6.60

0.00*

176.17

<1500

0 - 300

Kanya.TC-Ishaka2

34.00

72.00

11.89

59.15 ± 1.88

20.10

BTS-Central1

72.00

103.00

9.11

84.80 ± 1.44

10.75

SAGSS-Central2

72.00

88.00

5.04

79.45 ± 0.80

6.35

Nyaka.TC

62.00

89.00

7.77

77.25 ± 1.23

10.06

Apparent Colour (Pt/Co)

Bassa.PS-Ishaka1

0.00

11.00

3.04

5.60 ± 0.48

54.22

0.00*

109.00

<15

<300

Kanya.TC-Ishaka2

0.00

9.00

2.17

6.13 ± 0.34

35.50

BTS-Central1

4.00

14.00

2.32

9.50 ± 0.37

24.43

SAGSS-Central2

7.00

14.00

1.69

9.65 ± 0.27

17.49

Nyaka.TC

4.00

14.00

2.23

8.80 ± 0.35

25.37

Turbidity (NTUs)

Bassa.PS-Ishaka1

0.83

1.99

0.40

1.44 ± 0.06

27.62

0.00*

123.67

<5.0

<5.0

Kanya.TC-Ishaka2

0.27

0.88

0.18

0.46 ± 0.03

40.20

BTS-Central1

1.86

3.95

0.59

2.46 ± 0.09

23.94

SAGSS-Central2

1.84

2.39

0.17

2.05 ± 0.03

8.13

Nyaka.TC

1.24

2.89

0.44

1.99 ± 0.07

22.05

Total Hardness (mg/L)

Bassa.PS-Ishaka1

24.00

39.00

3.90

33.05 ± 0.62

11.81

0.00*

20.41

<100

<100

Kanya.TC-Ishaka2

58.00

65.00

1.67

60.85 ± 0.26

2.75

BTS-Central1

24.00

35.00

3.11

29.88 ± 0.49

10.40

SAGSS-Central2

20.00

26.00

1.44

23.03 ± 0.23

6.26

Nyaka.TC

22.00

26.00

1.29

24.15 ± 0.20

5.35

Total Iron (mg/L)

Bassa.PS-Ishaka1

0.060

0.230

0.043

0.136 ± 0.007

31.54

0.00*

-

<0.2

<0.3

Kanya.TC-Ishaka2

0.000

0.100

0.024

0.036 ± 0.004

66.48

BTS-Central1

0.030

0.160

0.049

0.076 ± 0.008

63.75

SAGSS-Central2

0.080

0.190

0.032

0.111 ± 0.005

28.87

Nyaka.TC

0.040

0.140

0.024

0.096 ± 0.004

24.86

Residual Alum (mg/L)

Bassa.PS-Ishaka1

0.060

0.170

0.027

0.108 ± 0.004

24.83

0.02*

-

<0.2

<0.2

Kanya.TC-Ishaka2

0.000

0.160

0.037

0.092 ± 0.006

40.63

BTS-Central1

0.070

0.160

0.026

0.113 ± 0.004

22.81

SAGSS-Central2

0.060

0.150

0.022

0.104 ± 0.004

21.39

Nyaka.TC

0.000

0.150

0.029

0.101 ± 0.005

28.78