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A Comparative Cancer Risk Evaluation of MTBE and Other Compounds (Including Naturally Occurring Compounds) in Drinking Water in New Hampshire

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  • Leslie A. Beyer
  • Grace I. Greenberg
  • Barbara D. Beck

Abstract

Methyl tert‐butyl ether (MTBE) was added to gasoline in New Hampshire (NH) between 1995 and 2006 to comply with the oxygenate requirements of the 1990 Amendments to the Clean Air Act. Leaking tanks and spills released MTBE into groundwater, and as a result, MTBE has been detected in drinking water in NH. We conducted a comparative cancer risk assessment and a margin‐of‐safety (MOS) analysis for several constituents, including MTBE, detected in NH drinking water. Using standard risk assessment methods, we calculated cancer risks from exposure to 12 detected volatile organic compounds (VOCs), including MTBE, and to four naturally occurring compounds (i.e., arsenic, radium‐226, radium‐228, and radon‐222) detected in NH public water supplies. We evaluated exposures to a hypothetical resident ingesting the water, dermally contacting the water while showering, and inhaling compounds volatilizing from water in the home. We then compared risk estimates for MTBE to those of the other 15 compounds. From our analysis, we concluded that the high‐end cancer risk from exposure to MTBE in drinking water is lower than the risks from all the other VOCs evaluated and several thousand times lower than the risks from exposure to naturally occurring constituents, including arsenic, radium, and radon. We also conducted an MOS analysis in which we compared toxicological points of departure to the NH maximum contaminant level (MCL) of 13 µg/L. All of the MOSs were greater than or equal to 160,000, indicating a large margin of safety and demonstrating the health‐protectiveness of the NH MCL for MTBE.

Suggested Citation

  • Leslie A. Beyer & Grace I. Greenberg & Barbara D. Beck, 2020. "A Comparative Cancer Risk Evaluation of MTBE and Other Compounds (Including Naturally Occurring Compounds) in Drinking Water in New Hampshire," Risk Analysis, John Wiley & Sons, vol. 40(12), pages 2584-2597, December.
    • Handle: RePEc:wly:riskan:v:40:y:2020:i:12:p:2584-2597
    DOI: 10.1111/risa.13570
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    References listed on IDEAS

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    1. Rajagopal, 2014. "The Human Factors," Palgrave Macmillan Books, in: Architecting Enterprise, chapter 9, pages 225-249, Palgrave Macmillan.
    2. Pamela R. D. Williams & Laurie Benton & Patrick J. Sheehan, 2004. "The Risk of MTBE Relative to Other VOCs in Public Drinking Water in California," Risk Analysis, John Wiley & Sons, vol. 24(3), pages 621-634, June.
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