Microbiological Quality and Contamination Level of Water Sources in Isiolo County in Kenya

Table 1

The mean microbial counts for ground, surface and chlorinated water sources.

Water source	E.coli (Cfu/ml)	Total coliforms (Cfu/ml)	Staphylococcus (Cfu/ml)	Clostridium (Cfu/ml)
Borehole	13.91±9.16 a	2166±95.24ab	674±18.21a	1368±33.78a
Spring	35.92±8.89a	4955±29.92abc	895±24.14a	8177±29.55b
Tap water	6.0±0.54 a	2723±56.29abc	308±8.86a	131±13.92a
Shallow well	15.26±5.86a	5185±66.83abc	2183±25.47a	1020±22.16a
Rain	160.0±14.14b	170±14.14a	2450±12.13a	1500±27.11ab
River	42.59±7.21a	2079±48.59ab	448±45.95a	878±16.48a
Trough	0.0±0.0 a	14012±77.5 ac	1207±16.18a	3513±15.87ab
Pan	6.25±0.75 a	1635±88.21a	8.0±0.57a	1750±26.55ab

(1) Values are means of more than 10 determinations ± standard deviations.
(2) Values with the same letters on the same column are not significantly different at 5 % level of significance.