Table 1. Pesticides measured during the U.S. Geological Survey National Water-Quality Assessment Program’s Agricultural Chemicals Team studies.


[mg/L, milligrams per liter]


Analyte	Chemical registry No.	Matrix	PCODE	Method reporting limit (mg/L)
Amide Herbicides1
Acetochlor	34256-82-1	water, filtered	49260	0.006
Alachlor	15972-60-8	water, filtered	46342	.005
Dimethenamid	87674-68-8	water, filtered	61588	.02
Flufenacet	142459-58-3	water, filtered	62481	.02
Metolachlor	51218-45-2	water, filtered	39415	.013
Pronamide	23950-58-5	water, filtered	82676	.004
Propachlor	1918-16-7	water, filtered	04024	.025
Organophosphate Insecticides
Azinphos-methyl	86-50-0	water, filtered	82686	0.05
Chlorpyrifos	2921-88-2	water, filtered	38933	.005
Diazinon	333-41-5	water, filtered	39572	.005
Dichlorvos	62-73-7	water, filtered	38775	.0118
Dicrotophos	141-66-2	water, filtered	38454	.0843
Dimethoate	60-51-5	water, filtered	82662	.0061
Ethion	563-12-2	water, filtered	82346	.004
Fenamiphos	22224-92-6	water, filtered	61591	.029
Fonofos	944-22-9	water, filtered	04095	.003
Isofenphos	25311-71-1	water, filtered	61594	.0034
Malathion	121-75-5	water, filtered	39532	.027
Methidathion	950-37-8	water, filtered	61598	.0058
Methyl parathion	298-00-0	water, filtered	82667	.015
Phorate	298-02-2	water, filtered	82664	.011
Phosmet	732-11-6	water, filtered	61601	.0079
Terbufos	13071-79-9	water, filtered	82675	.017
Triazine Herbicides
Atrazine	1912-24-9	water, filtered	39632	0.007
Metribuzin	21087-64-9	water, filtered	82630	.006
Prometon	1610-18-0	water, filtered	04037	.005
Prometryn	7287-19-6	water, filtered	04036	.0054
Simazine	122-34-9	water, filtered	04035	.005
Terbuthylazine	5915-41-3	water, filtered	04022	.0102
Miscellaneous Pesticides (use)
Benfluralin (herbicide)	1861-40-1	water, filtered	82673	0.01
Carbaryl (insecticide)	63-25-2	water, filtered	82680	.041
Cyfluthrin (insecticide)	68359-37-5	water, filtered	61585	.008
Cypermethrin (insecticide)	52315-07-8	water, filtered	61586	.0086
Dacthal (herbicide)	1861-32-1	water, filtered	82682	.003
Fipronil (insecticide)	120068-37-3	water, filtered	62166	.016
Glyphosate (herbicide)	1071-83-6	water, filtered	62722	.02
Iprodione (fungicide)	36734-19-7	water, filtered	61593	1.4223
Metalaxyl (fungicide)	57837-19-1	water, filtered	61596	.0051
Myclobutanil (fungicide)	88671-89-0	water, filtered	61599	.008
Pendimethalin (herbicide)	40487-42-1	water, filtered	82683	.022
Permethrin, cis (insecticide)	54774-45-7	water, filtered	82687	.006
Tebuthiuron (herbicide)	34014-18-1	water, filtered	82670	.016
Trifluralin (herbicide)	1582-09-8	water, filtered	82661	.009

¹Analytical results for amide parent herbicides are from analyses performed at the USGS National Water Quality Laboratory. Results from the USGS Organic Geochemistry Research Laboratory also are available on request.

First posted June 23, 2011