Assessment of Groundwater Quality Using Water Quality Index from Selected Springs in Manga Subcounty, Nyamira County, Kenya

Table 3

Statistical analysis of the observed groundwater quality parameters in the Manga region.

Parameter	Min	Max	Range	Mean	Std. deviation	C.I of mean	KS distance	KS prob	SWilk W	SWilk prob
pH	5.1	5.7	0.60	5.4	0.30	0.745	0.175	0.654	1.00	1.00
Turbidity	0.84	1.05	0.21	0.93	0.0624	0.269	0.276	0.404	0.942	0.537
Nitrate	0.68	1.20	0.52	0.92	0.262	0.652	0.227	0.569	0.983	0.747
Phosphate	0.08	0.24	0.16	0.153	0.808	0.201	0.232	0.555	0.980	0.726
Calcium	6.00	9.00	3.00	7.667	0.882	3.795	0.253	0.487	0.964	0.637
Magnesium	0.67	1.20	0.53	0.923	0.153	0.660	0.202	0.627	0.994	0.855
Chloride	1.00	3.00	2.00	2.00	1.00	2.484	0.175	0.654	1.000	1.000
Fluoride	0.00	0.00	0.00	0.000	0.000	0.000	0.000	0.000	0.000	<0.001
Sulphate	2.00	4.00	2.00	2.667	1.155	2.868	0.385	0.089	0.750	<0.001
Iron	0.00	0.00	0.00	0.000	0.000	0.000	0.000	0.000	0.000	<0.001
Total phosphorous	0.16	0.36	0.20	0.267	0.101	0.250	0.219	0.590	0.987	0.780
Total hardness	8.00	10.0	2.00	9.333	1.155	2.868	0.385	0.089	0.750	<0.001
Total alkalinity	17.0	20.0	3.00	19.00	1.000	4.303	0.385	0.089	0.750	<0.001
TDS	22.0	25.0	3.00	23.33	1.528	3.795	0.253	0.487	0.964	0.637
Coliforms	0.00	0.00	0.00	0.000	0.000	0.000	0.000	0.000	0.000	<0.001