Table 1.

Number of water samples collected from the 6 geopolitical zones located at varying altitudes

Geopolitical zone	No. of samples	Altitude (m)
North Central	107	115–467
North East	76	190–609
North West	124	351–645
South-South	134	38–98
South East	86	91–137
South West	91	224–302
Total	618