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Public health interpretation of trihalomethane blood levels in the United States: NHANES 1999–2004

Journal of Exposure Science & Environmental Epidemiology volume 20, pages 255–262 (2010)Cite this article

Abstract

Trihalomethanes (THMs) can form as byproducts during drinking water disinfection, which is crucial for limiting human exposure to disease-causing pathogens. The US Environmental Protection Agency (USEPA), recognizing both the importance of water disinfection for public health protection and potential risks associated with THM exposure, developed disinfection byproduct rules with the parallel goals of ensuring safe drinking water and limiting the levels of THMs in public water systems. The National Health and Nutrition Examination Survey (NHANES) THM blood data can be used as a means for assessing US population exposures to THMs; biomonitoring equivalents (BEs) can provide human health risk-based context to those data. In this paper, we examine the blood THM levels in the 1999–2004 NHANES data to (i) determine weighted population percentiles of blood THMs, (ii) explore whether gender and/or age are associated with blood THM levels, (iii) determine whether temporal trends can be discerned over the 6-year timeframe, and (iv) draw comparisons between population THM blood levels and BEs. A statistically significant decrease in blood chloroform levels was observed across the 1999–2004 time period. Age-related differences in blood chloroform levels were not consistent and no gender-related differences in blood chloroform levels were observed. The concentrations of all four THMs in the blood of US residents from the 2003 to 2004 NHANES dataset are below BEs consistent with the current US EPA reference doses. For bromodichloromethane and dibromochloromethane, the measured median blood concentrations in the United States are within the BEs for the 10−6 and 10−4 cancer risk range, whereas measured values for bromoform generally fall below the 10−6 cancer risk range. These assessments indicate that general population blood concentrations of THMs are in a range considered to be a low to medium priority for risk assessment follow-up, according to the guidelines for interpretation of biomonitoring data using BEs.

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Acknowledgements

We thank Dr. Lalith Silva and Mitchell Smith for analysis of thousands of NHANES blood samples to generate the published dataset. The findings and conclusions in this report are those of the authors and do not necessarily represent the views of the CDC nor of ACC. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.

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Authors and Affiliations

  1. LaKind Associates, LLC, Catonsville, Maryland, USA

    Judy S Lakind

  2. Department of Epidemiology and Preventive Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA

    Judy S Lakind

  3. Department of Applied Mathematics and Statistics, The Johns Hopkins University, Baltimore, Maryland, USA

    Daniel Q Naiman

  4. Summit Toxicology, LLP, Lyons, Colorado, USA

    Sean M Hays

  5. Summit Toxicology, LLP, Falls Church, Virginia, USA

    Lesa L Aylward

  6. Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA

    Benjamin C Blount

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  1. Judy S Lakind
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Correspondence to Judy S Lakind.

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Competing interests

Dr LaKind, Mr. Hays and Ms. Aylward received support for this research from the American Chemistry Council (ACC). Additional support was provided by the Centers for Disease Control and Prevention (CDC). ACC was not involved in the design, collection, management, analysis or interpreatation of the data; or in the preparation or approval of the manuscript.

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Lakind, J., Naiman, D., Hays, S. et al. Public health interpretation of trihalomethane blood levels in the United States: NHANES 1999–2004. J Expo Sci Environ Epidemiol 20, 255–262 (2010). https://doi.org/10.1038/jes.2009.35

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