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Table 1

Indicator bacterial concentration in the product water of GO-installed and NGO-installed dug well in different seasons

Wet season
Dry season
Indicator bacteria (cfu/100 ml)Sampling sourcesMean ± SDMedMinMaxMean ± SDMedMinMax
TC GO dug well 16,750 ± 14,130a 12,000 900 48,800 8,719 ± 948b 4,650 300 35,000 
 NGO dug well 13,418± 13,730a 8,700 500 48,000 3,387 ± 2,235b 2,100 700 9,000 
FC GO dug well 101 ± 116a 35 <1 420 33 ± 61b <1 240 
 NGO dug well 42 ± 32 27 <1 190 22 ± 43 0.5 <1 140 
E. coli GO dug well 59 ± 62a 41 <1 236 21 ± 39b <1 180 
 NGO dug well 78 ± 102a 21 <1 280 14 ± 29b <1 <1 100 
Wet season
Dry season
Indicator bacteria (cfu/100 ml)Sampling sourcesMean ± SDMedMinMaxMean ± SDMedMinMax
TC GO dug well 16,750 ± 14,130a 12,000 900 48,800 8,719 ± 948b 4,650 300 35,000 
 NGO dug well 13,418± 13,730a 8,700 500 48,000 3,387 ± 2,235b 2,100 700 9,000 
FC GO dug well 101 ± 116a 35 <1 420 33 ± 61b <1 240 
 NGO dug well 42 ± 32 27 <1 190 22 ± 43 0.5 <1 140 
E. coli GO dug well 59 ± 62a 41 <1 236 21 ± 39b <1 180 
 NGO dug well 78 ± 102a 21 <1 280 14 ± 29b <1 <1 100 

SD, standard deviation; Med, median; Min, minimum; Max, maximum; FC, faecal coliform; TC, total coliform.

a,bSignificantly different between wet and dry seasons at p < 0.05 by Wilcoxon signed rank t-test.

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