Table 3. Neonicotinoids in playa water samples collected in 2014.

Playa type		Thiamethoxam	Imidacloprid	Acetamiprid	Clothianidin
Urban	4 sites	50%	0%	0%	0%
	(Low)	0.3 ng/mL	ND	ND	ND
	(High)	3.8 ng/mL	ND	ND	ND
Mean (total neonicotinoids) ± standard error = 1.1 ng/mL ± 0.9
Crop	10 sites	40%	20%	0%	20%
	(Low)	0.6 ng/mL	1.1 ng/mL	ND	0.1 ng/mL
	(High)	3.1 ng/mL	1.8 ng/mL	ND	1.1 ng/mL
Mean (total neonicotinoids) ± standard error = 1.0 ng/mL ± 0.4
Range	7 sites	29%	0%	14%	29%
	(Low)	0.5 ng/mL	ND	3.5 ng/mL	0.2 ng/mL
	(High)	0.6 ng/mL	ND	3.5 ng/mL	0.2 ng/mL
Mean (total neonicotinoids) ± standard error = 0.7 ng/mL ± 0.6

Notes:

Frequency of detection, as well as low and high concentrations for individual neonicotinoids are indicated.

ND, not detected. The limit of detection for neonicotinoids in water was approximately 0.05 ng/mL. The limit of quantitation was 0.1 ng/mL.