Table 2. Antibiotics detected in water samples collected upstream and downstream of the Tahlequah water resource recovery facility in November 2007.

Antibiotic	Detection limit	Upstream	Downstream
azithromycin	<0.005 μg/L	NDa	0.042 μg/L
chloramphenicol	<0.1 μg/L	ND	ND
chlorotetracycline	<0.01 μg/L	ND	ND
ciprofloxacin	<0.005 μg/L	ND	0.006 μg/L
doxycycline	<0.01 μg/L	ND	ND
enrofloxacin	<0.005 μg/L	ND	ND
erythromycin	<0.008 μg/L	ND	ND
lincomycin	<0.005 μg/L	ND	ND
lomefloxacin	<0.005 μg/L	ND	ND
norfloxacin	<0.005 μg/L	ND	ND
ofloxacin	<0.005 μg/L	ND	0.039 μg/L
ormetoprim	<0.005 μg/L	ND	ND
oxytetracycline	<0.01 μg/L	ND	ND
roxithromycin	<0.005 μg/L	ND	ND
sarafloxacin	<0.005 μg/L	ND	ND
sulfachloropyridazine	<0.005 μg/L	ND	ND
sulfadiazine	<0.1 μg/L	ND	ND
sulfadimethoxine	<0.005 μg/L	ND	ND
sulfamethazine	<0.005 μg/L	ND	ND
sulfamethoxazole	<0.005 μg/L	ND	ND
sulfathiazole	<0.02 μg/L	ND	ND
tetracycline	<0.01 μg/L	ND	ND
trimethoprim	<0.005 μg/L	ND	0.024 μg/L
tylosin	<0.005 μg/L	ND	ND
virginiamycin	<0.005 μg/L	ND	ND

^aND = none detected