EFFECT OF GROUNDWATER CONTAMINATION.
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EFFECT OF GROUNDWATER CONTAMINATION.
ABSTRACT
In Nigeria, an inadequate supply of piped water is a big concern, hence many homes have wells as a source of water for domestic use. The groundwater from forty wells in the Agbowo village was tested for Total Aerobic Bacterial Counts (TABC) and Total Coliform Counts (TCC).
The locations and lengths between wells and septic tanks were determined using a Global Positioning System (GPS) device and a tape rule, respectively.
All examined wells revealed significant TABC (4.76±1.41 log CFU/mL) and TCC (2.29±0.67 log CFU/mL) counts, exceeding the international standard of 0 per 100 mL of drinkable water.
Bacterial counts were not significantly different between covered and uncovered wells (p >0.05). The average distance between wells and septic tanks was 8.93±3.61m, which was less than the USEPA’s standard of 15.24 m or 50 ft.
TABC rose with decreasing distance between wells and septic tanks, but not significantly (p < 0.05).There was a weak positive association (r2=0.021) between septic tank distance and CC, and a weak negative correlation (r2=-0.261) between TCC and TABC.
This study emphasises the importance of establishing criteria for well siting from septic tanks while taking into account all potential sources of well pollution, as well as treating ground water before use.
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