IWA Publishing

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 sources	Mean ± SD	Med	Min	Max	Mean ± SD	Med	Min	Max
TC	GO dug well	16,750 ± 14,130^a	12,000	900	48,800	8,719 ± 948^b	4,650	300	35,000
	NGO dug well	13,418± 13,730^a	8,700	500	48,000	3,387 ± 2,235^b	2,100	700	9,000
FC	GO dug well	101 ± 116^a	35	<1	420	33 ± 61^b	3	<1	240
	NGO dug well	42 ± 32	27	<1	190	22 ± 43	0.5	<1	140
E. coli	GO dug well	59 ± 62^a	41	<1	236	21 ± 39^b	2	<1	180
	NGO dug well	78 ± 102^a	21	<1	280	14 ± 29^b	<1	<1	100

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