Atrazine

Atrazine is a broad-leaf, pre-emergence herbicide, widely used in agriculture and used to a lesser extent in urban areas. The maximum contaminant level (MCL; the legally allowable concentration of a toxic chemical allowed in public water supply systems) for atrazine is 3.0 mg/L. Trade names of this product include G-30027, Aatrex, Aktikon, Alazine, Atred, Atranex, Atrataf, Atratol, Azinotox, Crisazina, Farmco Atrazine, Gesaprim, Giffex 4L, Malermais, Primatol, Simazat, and Zeaphos.

Deethylatrazine

Deethylatrazine is a breakdown product of atrazine.

Simazine

Simazine is used as a pre-emergence herbicide for control of broad-leaved and grassy weeds. Its major use is on corn, but it is also used on a variety of deep-rooted crops such as artichokes, asparagus, berry crops, broad beans, citrus, etc., and on non-crop areas such as farm ponds and fish hatcheries. The MCL for simazine is 4.0 mg/L. Trade names of this product include Aquazine, Cekusan, Cekusima, Framed, G-27692, Gesatop, Primatol, Princep, Simadex, Simanex, Tanzine, and Totazina.

Carbaryl

Carbaryl is an insecticide used on citrus, fruit, cotton, forests, lawns, nuts, ornamentals, shade trees, and other crops, as well as on poultry, livestock, and pets. There is no MCL for carbaryl, but it has an EPA lifetime health-advisory (HA) of 700 mg/L. Product names include Carbamine, Denapon, Dicarbam, Hexavin, Karbaspray, Nac, Ravyon, Septene, Sevin, Tercyl, Tricarnam, and Union Carbide 7744.

Diazinon

Diazinon is an insecticide used on home gardens and farms to control a wide variety of sucking and leaf- eating insects. It is used on rice, fruit trees, sugarcane, corn, tobacco, potatoes, and horticultural plants. It is an ingredient in pest strips and is used to control fleas and ticks. There is no MCL for diazinon, but it has an EPA lifetime HA of 0.6 mg/L. Trade names of this product include Knox Out, Spectracide, and Basudin.

The information on the pesticides detected in Barton Springs was summarized from the following links:

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http://www.epa.gov/ost/drinking/standards/dwstandards.pdf

http://www.epa.gov/OGWDW/dwh/c-soc.html

http://pmep.cce.cornell.edu/profiles/extoxnet

http://www.scorecard.org/chemical-profiles/

http://water.wr.usgs.gov/pnsp/use92

Additional information can be found on these sites.

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