TABLE 4.

Average aerobic mesophilic bacterial and total coliform counts in groundwater samples by region^a

Region	Sample type	n	Avg count (log CFU/100 ml) ± SDb
			Aerobic mesophilic bacteria	Total coliforms
Delaware	Source	15	1.27 ± 1.75	1.23 ± 1.75
	End of line	5	3.59 ± 0.74	3.30 ± 1.71
	Total	20	1.84 ± 2.00 a	1.75 ± 1.93 a
Central Maryland	Source	7	2.50 ± 1.31	1.50 ± 1.27
	End of line	0	—	—
	Total	7	2.50 ± 1.31 a	1.50 ± 1.27 ab
Eastern Shore	Source	13	1.04 ± 1.63	1.04 ± 1.77
	End of line	3	1.76 ± 2.03	1.37 ± 2.12
	Total	16	1.18 ± 1.66 ab	1.10 ± 1.77 ab
New Jersey	Source	31	0.36 ± 0.78	0.18 ± 0.44
	End of line	20	1.04 ± 1.04	0.92 ± 1.78
	Total	51	0.63 ± 1.30 b	0.47 ± 1.20 b

^aGroundwater samples included shallow and deep wells; municipal water samples are omitted from this table. No generic E. coli was detected in any of the groundwater samples.

^bData for regions having different letters were significantly different (P < 0.05) within the column. Data were log transformed prior to statistical analysis. —, no end-of-line groundwater samples were collected from that region.