Factors Affecting the Occurrence and Distribution of Pesticides in the Yakima River Basin, Washington, 2000

Scientific Investigations Report 2007–5180

Table 4. Pesticide detection frequency in samples collected in July and October 2000, Yakima River Basin, Washington.

Compound	July detection frequency (in percent)		October detection frequency (in percent)
Number of samples	Unscreened	Screened at 0.02 μg/L	Numer of samples	Unscreened	Screened at 0.02 μg/L
Parent pesticides
2,4-D	51	84	82		33	12	3
2,4-D methyl ester	51	49	29		33	–	–
Acetochlor	51	14	2		33	–	–
Alachlor	51	16	4		33	3	–
Atrazine	51	82	27		33	70	15
Azinphos-methyl	51	37	37		33	–	–
Bentazon	51	35	14		33	30	18
Bifenthrin	51	2	–		33	–	–
Bromacil	51	14	8		33	33	12
Bromoxynil	51	10	4		33	–	–
Carbaryl	51	24	14		33	–	–
Carbofuran	51	–	–		33	3	3
Chlorpyrifos	51	12	2		33	–	–
Clopyralid	51	–	–		33	3	–
Cyanazine	51	2	–		33	–	–
Diazinon	51	2	2		33	–	–
Dicamba	51	20	18		33	–	–
Dieldrin	49	4	–		33	–	–
Dimethoate	51	4	2		33	–	–
Dinoseb	51	12	4		33	12	–
Disulfoton	51	2	–		33	–	–
Diuron	51	37	24		33	30	6
EPTC	49	41	4		28	4	–
Ethalfluralin	51	10	2		33	–	–
Fluometuron	51	2	–		33	–	–
gamma-HCH	51	2	–		33	–	–
Hexazinone	51	37	–		33	12	–
Imidacloprid	51	2	2		33	–	–
Linuron	51	–	–		33	3	–
Malathion	51	6	2		33	–	–
MCPA	51	2	2		33	–	–
MCPB	51	2	–		33	–	–
Metalaxyl	51	2	–		33	6	–
Methomyl	51	10	10		33	–	–
Methyl-parathion	51	2	2		33	–	–
Metolachlor	51	2	–		33	–	–
Metribuzin	51	2	–		33	–	–
Metsulfuron-methyl	51	8	4		33	–	–
Myclobutanil	51	33	12		33	6	–
Nicosulfuron	51	2	2		33	–	–
Norflurazon	51	25	4		33	30	3
Oryzalin	51	–	–		33	3	–
Oxyfluorfen	51	2	–		33	–	–
Pendimethalin	51	8	2		33	–	–
Phosmet	51	2	2		33	–	–
Picloram	51	4	4		33	–	–
Prometon	51	–	–		33	6	–
Propargite	50	6	2		33	–	–
cis-Propiconazole	51	2	–		33	–	–
trans-Propiconazole	51	2	–		33	–	–
Simazine	51	22	6		33	36	6
Sulfometuron-methyl	51	2	–		33	–	–
Tebuthiuron	51	–	–		33	3	–
Terbacil	51	16	16		33	3	3
Trifluralin	51	20	–		33	–	–
Pesticide degradates
1,4-Napthaquinone	51	4	4		33	–	–
1-Naphthol	51	18	6		33	–	–
2-(4-tert-butylphenoxy)-cyclohexanol	51	25	–		33	3	–
2-Hydroxyatrazine	51	16	8		33	39	–
3,4-Dichloroaniline	51	4	–		33	3	–
4,4'-Dichlorobenzophenone	51	14	–		33	–	–
p,p'-DDE	50	42	–		33	36	–
Deethylatrazine	51	80	22		33	82	27
Deisopropylatrazine	51	8	6		33	12	3
Didealkylatrazine	51	18	4		33	21	9
Disulfoton sulfone	51	16	10		33	–	–
Disulfoton sulfoxide	51	8	8		33	–	–
Endosulfan sulfate	51	14	–		33	–	–
Fenamiphos sulfoxide	51	4	2		33	–	–

Compound

July detection frequency (in percent)

October detection frequency (in percent)

Number of
samples

Unscreened

Screened at
0.02 μg/L

Numer of
samples

Unscreened

Screened at
0.02 μg/L

Parent pesticides

2,4-D

2,4-D methyl ester

–

Acetochlor

–

Alachlor

–

Atrazine

Azinphos-methyl

–

Bentazon

Bifenthrin

–

Bromacil

Bromoxynil

–

Carbaryl

–

Carbofuran

–

Chlorpyrifos

–

Clopyralid

–

Cyanazine

–

Diazinon

–

Dicamba

–

Dieldrin

–

Dimethoate

–

Dinoseb

–

Disulfoton

–

Diuron

EPTC

–

Ethalfluralin

–

Fluometuron

–

gamma-HCH

–

Hexazinone

–

Imidacloprid

–

Linuron

–

Malathion

–

MCPA

–

MCPB

–

Metalaxyl

–

Methomyl

–

Methyl-parathion

–

Metolachlor

–

Metribuzin

–

Metsulfuron-methyl

–

Myclobutanil

–

Nicosulfuron

–

Norflurazon

Oryzalin

–

Oxyfluorfen

–

Pendimethalin

–

Phosmet

–

Picloram

–

Prometon

–

Propargite

–

cis-Propiconazole

–

trans-Propiconazole

–

Simazine

Sulfometuron-methyl

–

Tebuthiuron

–

Terbacil

Trifluralin

–

Pesticide degradates

1,4-Napthaquinone

–

1-Naphthol

–

2-(4-tert-butylphenoxy)-cyclohexanol

–

2-Hydroxyatrazine

–

3,4-Dichloroaniline

–

4,4'-Dichlorobenzophenone

–

p,p'-DDE

–

Deethylatrazine

Deisopropylatrazine

Didealkylatrazine

Disulfoton sulfone

–

Disulfoton sulfoxide

–

Endosulfan sulfate

–

Fenamiphos sulfoxide

–

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