Table 1.

The range of seasonal E. coli counts (MPN/100 ml) in water.

Water sources	Seasonal counts (MPN/100 ml)
	Dry season	Wet season
Borehole	0–0.2 × 101	0–0.2 × 101
Canal	2.3 × 101–1.1 × 102	3.1 × 101–6.3 × 101
Dam	0.7 × 101–1.1 × 102	1.2 × 101–7.9 × 101
Hand-dug well	0–0.2 × 101	0–0.4 × 101
River	0–0.1 × 101	0.2 × 101–0.7 × 101
Streams	0–3.3 × 101	0–3.3 × 101