Tonto National Forest
 

Land & Resources Management

Forest Plans

 

Globe Ranger District Herbicide Studies

1. In the mid-1960s the Forest Service treated chaparral vegetation with an herbicide mixture of 2,4,5-T and 2,4-D [also known as Agent Orange] on the Globe Ranger District, Tonto National Forest.

2. Spraying was isolated to Kellner, Icehouse, and Six-shooter canyons.

3. According to EPA, the residue from spraying is gone from the environment after one growing season as it is broken down by sun and weather.

4. In 1992 and 1993, the Arizona Department of Environmental Quality (ADEQ) sampled for 2,4,5-T, 2,4-D, silvex and their metabolites in Kellner Canyon and found no detectable amounts in all water and sediment samples. ADEQ Study 1992 (117KB)

5. In 1998, the Agency for Toxic Substances and Disease Registry (ATSDR) performed a Health Consultation for the dioxin spraying. They found there was no reason for further health or environmental follow-up. ATSDR/Cong. Hayworth ltrs pdf  (300K) and ATSDR Study 1998 pdf (341KB)