The concentration of zinc in the shallow wells under study ranged from 0 to 38.14mg/l. The metal was detected in
all but one location (Well 24). The average reading was 8.62 mg/l and this was surpassed in 8 locations. The
observations were varied with a standard deviation of 10.82.
Further comparisons of the estimated values of physico-chemical parameters of water were made with standards
set by the World Health Organization (WHO) and the Standard Organization of Nigeria (SON). The results are
shown in Figure 4a to Figure 4k. The pH reading as shown in Figure 4a showed that 13 locations fall below the
minimum level of 6.5. This implies that water in such locations tends to be acidic. The farther away from the 6.5
minimum limit, the more acidic the water. This indicates poor water quality. The remaining 17 locations were
within the acceptable range. No location was above the 8.5 maximum limit. Total dissolved solids affect the taste
of drinking water if present at levels above the WHO recommended 500 mg/l level. TDS values were much
higher with Wells 3, 4, 15, 20, 22 and 23 exceeding the recommended limit of 500mg/l.