From 1929 to 1971, polychlorinated biphenyls (PCBs) were manufactured at an industrial facility formerly owned and operated by the Swann Chemical Company (1929-1935) and after 1935 by Monsanto Chemical Corporation in Anniston, Alabama. Releases of PCBs into the air and water by volatilization, deposition into landfills, and migration into surface water led to substantial environmental contamination, human exposure and community health concerns, and ultimately litigation and settlement in state and federal court (Grunwald, 2001External; Love, 2007). The chemical plant continued to produce other chemicals and was owned and operated by Solutia, Inc., since 1997. It was recently acquired by Eastman Chemical Company.External Prior to 1971, when Monsanto ceased manufacture of PCBs in Anniston, there were no federal or state regulations governing the manufacture, sale, distribution or disposal of PCBs.
In the 1990s and early 2000s, several investigations of exposure documented elevated levels of PCBs in some Anniston residents and in air and soil samples from the local environment (ADPH, 1996 Cdc-pdf[PDF – 1.19 MB]External; ATSDR, 2000). During the same time, extensive measures to prevent further spread of PCBs in Anniston and environmental cleanup of residential and other properties were undertaken by Monsanto and Solutia under the supervision of the Alabama Department of Environmental Management (ADEM) and the US EPA as part of the series of consent decrees mostly under Resource Conservation and Recovery Act (RCRA; the EPA Anniston websiteExternal).
From 2003 to 2007, the ATSDR funded the Anniston Environmental Health Research Consortium (AEHRC), a university and community partnership charged to plan and conduct the 2005-2007 Anniston Community Health Survey (ACHS) through a cooperative agreement with Jacksonville State University (Grant #U50/ATU473215). The study Institutional Review Board (IRB) approval was obtained at the University of Alabama at Birmingham.
Eating contaminated food products, especially fish and livestock, is the most important pathway of PCB exposure in people who have not been occupationally exposed to PCBs (Hovinga et al., 1992; Humphrey and Budd, 1996; Kreiss, 1981; Schecter et al., 2001; Startin et al., 1994). Exposures by way of inhalation and contact with the skin have also been studied (DeCaprio et al., 2005; Löffler and van Bavel, 2000), but exposures through these pathways generally contribute much less to the body burden than does exposure by eating contaminated food. In Anniston, records of high PCB contamination of locally raised hogs, chickens and other animals were presented during litigation (Chemical Industry Archives, 2001; Love, 2007). Local fish have been found to be contaminated above the U.S. Food and Drug Administration’s published tolerance of 2 parts per million (edible portion) (21CFR109.30External, 2012). As a result, “no consumption” fish advisories were issued in Anniston in the 1990s that are now still in effect (ADPH, 1995 Cdc-pdf[PDF – 2 MB]External, 1996 Cdc-pdf[PDF – 1.19 MB]External, 2011External).
Results from human health studies of environmental PCB exposure outside of Anniston provide some evidence of associations between PCB serum levels and a variety of health outcomes, including diabetes and its precursors (Codru et al., 2007; Langer et al., 2002; Lee et al., 2007, 2011; Rylander et al., 2005; Vasiliu et al., 2006; Wang et al., 2005), hypertension (Everett et al., 2008; Ha et al., 2009), adverse thyroid and metabolic health signs (Langer et al., 2009; Persky et al., 2001; Turyk et al., 2007), immune system effects (Heilman et al., 2006; Park et al., 2008), and some cancers (DeRoos et al., 2005; Hardell et al., 2004). (ATSDR has updated the Toxicological Profile for PCBs with more recent findings on health effects Cdc-pdf[PDF – 1.29 MB].)
Elevated levels of PCBs were found in ACHS participants in comparison to the general public. When compared with similar age and race groups reported from the National Health and Nutrition Examination Survey (NHANES) 2003-2004, PCB levels in Anniston were about three times higher for African-American participants and two times higher for White participants age 40 or older (Pavuk et al., 2014External; Patterson et al., 2009).
Results from the ACHS generally support findings in other health studies, showing associations between levels of PCBs in study participants’ blood and hypertension, blood pressure, and diabetes (Goncharov et al., 2010 Cdc-pdf[PDF – 201 KB], 2011 Cdc-pdf[PDF – 411 KB]External; Silverstone et al., 2012 Cdc-pdf[PDF – 316 KB]External).
ATSDR (Agency for Toxic Substances and Disease Registry), 2000. Health Consultation: Evaluation of soil, blood & air data from Anniston, Alabama. Monsanto Company, Anniston, Calhoun County, Alabama. CERCLIS No. ALD004019048. U.S. Department of Health and Human Services, Atlanta.
Chemical Industry Archives, Environmental Working Group, 2001. Trial Transcript, Owens v. Monsanto CV-96-J-440-E, (N.D. Alabama April 5, 2001), pg. 551, line 1; a memo from E.S. Tucker to W.B. Papageorge, December 21, 1970 (both Monsanto, PCB results for hog’s liver and fat samples). http://www.chemicalindustryarchives.org/dirtysecrets/annistonindepth/wildlife.aspExternal. Accessed: February 15, 2013.
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