TABLE 5.

Physical and chemical water quality analyses of stream water samples^a

Stream water site	Stream flow condition	% Average recovery of modified and viable oocysts	% Difference in recoveries for samples from the same site	pH	Specific conductance (μS/cm)	Dissolved iron (mg/liter)	Dissolved silica (mg/liter)	Turbidity (NTU)	Suspended sediment (mg/liter)	Alkalinity (mg/liter)
Alabama 1	Elevated	20		7.8	165	<10	6.2	39	35	63
Alabama 2a	Elevated	48	146	8.0	86	25	4.5	1.4	2.6	24
Alabama 2b	Elevated	7.5		7.8	96	172	3.5	155	ND	39
Colorado 1	Effluent	18		6.5	3,850	384	15	26	ND	ND
Colorado 2	Elevated	20		8.1	1,380	24	10	9.8	14	189
Georgia 1	Base	9.6	22	7.1	186	107	8.4	14	17	31
Georgia 1	High	12		7.1	190	125	7.1	59	165	20
Georgia 2	High	8.6		7.1	80	70	8.2	95	202	21
Indiana	Elevated	31		8.0	662	684	7.6	34	ND	223
Iowa	Base	26	159	7.5	906	18	17	1.8	41	313
Iowa	High	3.0		8.0	751	<10	20	208	610	244
Louisiana	Base	56	87	7.8	467	72	17	17	82	149
Louisiana	Elevated	22		6.8	199	144	9.1	34	74	64
Nebraska	High	2.9	171	8.1	545	<10	14	2,700	778	232
Nebraska	Base	37		8.4	533	<10	15	9.1	13	205
Ohio	Elevated	20	79	7.8	736	ND	ND	1.8	98	ND
Ohio	High	46		8.1	632	8.0	7.3	15	63	234
South Carolina 1	Base	40	29	7.1	132	51	5.6	2.2	30	30
South Carolina 1	Elevated	30		6.3	108	143	7.5	5.1	7.0	21
South Carolina 2	Elevated	19		6.2	48	153	3.4	15	45	5.0
Texas	Elevated	15	50	7.8	447	7.0	4.0	101	287	126
Texas	Base	25		7.3	667	18	7.8	35	55	100
Virginia 1	Base	17		7.1	345	53	7.8	7.3	3.0	60
Virginia 2	Elevated	38		8.0	443	15	3.6	8.3	9.8	183
Washington 1a	Base	27	20	8.0	327	22	22	15	52	112
Washington 1b	Base	22		8.0	406	<10	30	73	28	136
Washington 2	High	13		7.3	72	85	6.4	28	108	24
Wisconsin 1	High	18		7.5	519	36	4.9	425	378	190
Wisconsin 2	Base	32	6	8.3	724	13	7.3	19	17	202
Wisconsin 2	High	34		7.8	714	ND	ND	15	ND	192

^aND, not determined.