Big Horn County

Wyoming Water Science Center

Table 1. Pesticides, Wyoming ground-water quality standards, and summary of detections by county.

Focal Pesticides¹
Common name	Trade Name	Safe drinking water level (µg/L)	Type of pesticide (Meister, 1996)	County where pesticide was detected
Alachlor	Lasso	2	Preemergence herbicide	Laramie
Aldicarb	Temik	35	Systemic insecticide, nematicide	none
Aldicarb Sulfone	(Aldicarb degradation product)	35	Parent product action: Systemic insecticide, nematicide	Park, Washakie
Aldicarb Sulfoxide	(Aldicarb degradation product)	35	Parent product action: Systemic insecticide, nematicide	Park, Washakie
Atrazine	Aatrex	3	Selective herbicide	Fremont, Goshen, Laramie, Park, Washakie, Big Horn, Sheridan, Platte, Crook, Natrona, Sweetwater, Uinta, Converse, Albany, Hot Springs, Carbon, Sublette, Weston, Niobrara
Bromacil	Hyvar	90	Herbicide	Laramie, Big Horn, Platte, Natrona, Sweetwater, Uinta, Hot Springs, Carbon, Sublette, Weston, Niobrara
Clopyralid	Stinger, Curtail	NA	Herbicide	Converse, Albany, Sublette
Cyanazine	Bladex	1	Selective herbicide	Goshen, Washakie
2, 4-D	(many)	70	Selective herbicide	Platte, Converse
DCPA	Dacthal	70	Selective herbicide	Fremont, Washakie, Big Horn, Crook
Dicamba	Banvel	200	Herbicide	Sheridan
Dichloropropene	Telone	1,000	Nematicide, soil fumigant	none
Difenzoquat	Avenge	2	Selective herbicide	no analytical method available
Hexazinone	Velpar	400	Contact herbicide	Fremont, Goshen, Laramie, Park, Hot Springs
Metolachlor	Dual	100	Selective herbicide	Laramie, Park, Washakie, Big Horn
Metribuzin	Lexone, Sencor	200	Herbicide	Laramie, Big Horn
Metsulfuron	Ally, Escort	NA	Herbicide
Picloram	Tordon	500	Systemic herbicide	Fremont, Laramie, Lincoln, Park, Big Horn, Sheridan, Platte, Crook, Natrona, Sweetwater, Albany, Hot Springs, Campbell, Sublette, Weston, Niobrara
Simazine	Princep, Primatol	4	Selective herbicide	Fremont, Goshen, Laramie, Park, Washakie, Big Horn, Sheridan, Natrona, Uinta, Albany, Hot Springs, Carbon, Sublette, Weston, Niobrara
Tebuthiuron	Spike	500	Herbicide	Fremont, Laramie, Park, Washakie, Big Horn, Sheridan, Platte, Natrona, Sweetwater, Uinta, Converse, Albany, Hot Springs, Campbell, Carbon, Sublette
Non-focal Pesticides¹
Prometon	Pramitol	100	Non-selective herbicide	Goshen, Park, Washakie, Fremont, Lincoln, Laramie, Big Horn, Sheridan, Platte, Johnson, Crook, Natrona, Sweetwater, Teton, Uinta, Converse, Albany, Hot Springs, Campbell, Carbon, Sublette, Weston, Niobrara
Diuron	Farmco, Durashield	70	Herbicide	Laramie, Albany, Hot Springs, Campbell, Carbon, Sublette, Weston, Niobrara
Triclopyr	Garlon	1,000	Systemic herbicide	Converse
Malathion	Malaspray		Insecticide	Albany

¹The Ground-Water and Pesticide Strategy Committee focused sampling on 18 pesticides and 2 degradation products. The chemical analysis used to detect the focal pesticides can also detect 66 other pesticides and degradation products, which are listed in Table 1 as non-focal pesticides.

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U.S. Department of the Interior \| U.S. Geological Survey URL: http://wy.water.usgs.gov/projects/pesticide/table1.htm Page Contact Information: Wyoming Webmaster Page Last Modified: June 19, 2008