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. Author manuscript; available in PMC: 2021 Jul 27.
Published in final edited form as: Risk Anal. 2017 Nov 23;38(6):1183–1201. doi: 10.1111/risa.12933

Table V.

Estimated Hazard Quotients (HQs) and Hazard Indexes (HIs) for Hypothetical Residential Exposures to Chemicals from a Surface Water Source

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a

BDCM = bromodichloromethane, DCA = dichloroacetic acid, MeHg = methyl mercury.

b

The toxicity reference values are for chronic exposures from U.S. EPA’s Integrated Risk Information System,18 except for the BDCM inhalation value; that value is derived from subchronic exposure data, which increases the uncertainty underlying an inhalation HQ estimate for chronic exposures. Note that where available, current IRIS values should be used in regulatory applications. Dose additivity is assumed for this screening HI estimate. The calculated HQ and HI values are presented to two significant figures.

c

A dash ( – ) indicates the value is not calculated (because a standard reference concentration has not been established for DCA).