Worldwide Review
With nearly 6,000 studies on file at EPA and 50 years of on-farm use, it's easy to see why atrazine is considered to be one of the most well understood chemicals.
Experts have concluded that atrazine (at levels to which people could be exposed):
  • Does not cause adverse effects to reproductive systems.
  • Does not affect genetic development.
  • Does not cause birth defects.
  • Does not affect chromosome structure.
  • Is not estrogenic.
  • Does not disrupt endocrine function.
  • Does not cause cancer in humans.

"It is expected that the use of atrazine, consistent with good plant protection practice, will not have any harmful effects on human or animal health or any unacceptable effects on the environment."
Comment from a science review conducted for the European Union
Scientific Committee on Plants, United Kingdom, 1996

Atrazine is deemed "not classifiable as to carcinogenicity to humans," placing it in the same cancer risk category as substances such as tea, rubbing alcohol and talc.
World Health Organization,
International Agency for Research on Cancer, 1998

"EPA concludes that atrazine is 'not likely to be a human carcinogen.'"
US Environmental Protection Agency
Revised Atrazine Interim Re-registration Eligibility Decision, October 31, 2003

"...the epidemiological data provided support for the absence of a carcinogenic potential for atrazine."
Australian Pesticides & Veterinary Medicines Authority, 2004

"These and other additional analysis did not support a finding of association between prostate cancer and atrazine exposure."
US EPA, 2004, in evaluating a study conducted with workers at an atrazine manufacturing plant.

"We found no associations between cancer incidence and atrazine exposure...." Other studies showed no associations between atrazine exposure and specifically breast and prostate cancer.
Agricultural Health Study, 2003, 2004 and 2005 Conducted by National Cancer Institute, University of Iowa, Centers for Public Health Research & Evaluation, US EPA, National Institute for Environmental Health Sciences, IMS Inc.

"The Meeting concluded that atrazine is not likely to pose a carcinogenic risk to humans."
"Pesticide residues in food 2007" Report of the Joint Meeting of the FAO Panel of Experts on Pesticide Residues in Food and the Environment and the WHO Core Assessment Group on Pesticide Residues, Geneva, Switzerland, 18-27 September 2007

"The APVMA has not seen any direct evidence that current uses of atrazine pose a risk to human health. Indeed, extensive studies in laboratory animals show that there are no effects on health or reproduction in mammals maintained on drinking water containing atrazine and related compounds at low levels. Even at concentrations up to 100 times the levels that can sometimes be found in groundwater in the USA, laboratory test results indicate there were no toxic effects on the animals, their progeny or their ability to reproduce."
Australian Pesticides & Veterinary Medicines Authority, Final Review Report & Regulatory Decision,
Volume 1, 2008

"...published epidemiological data provide no support for the carcinogenicity potential of is unlikely that atrazine is an endocrine disruptor in humans."
Australian Pesticides & Veterinary Medicines Authority, Final Review Report & Regulatory Decision,
Volume 2, 2008