Description Usage Format Source References Examples
Water-quality benchmark concentrations of selected radionuclides, organic compounds, and chemical constituents. Benchmarks include: the U.S. Environmental Protection Agency (USEPA) Maximum Contaminant Levels (MCLs) and Human Health Benchmarks for Pesticides (HHBPs), and the U.S. Geological Survey (USGS) Health-Based Screening Levels (HBSLs).
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A data frame with 74 records and 9 variables:
parm_cd
USGS 5-digit parameter code, see parameters
dataset for details.
mcl
USEPA MCLs.
hhbp_noncancer
USEPA Chronic Noncancer HHBPs
hhbp_cancer_min
USEPA Carcinogenic HHBPs for a one-in-one million cancer risk.
hhbp_cancer_max
USEPA Carcinogenic HHBPs for a one-in-ten thousand cancer risk.
hbsl_noncancer
USGS Noncancer HBSLs
hbsl_cancer_min
USGS Cancer HBSLs for a one-in-one million cancer risk.
hbsl_cancer_max
USGS Cancer HBSLs for a one-in-ten thousand cancer risk.
remark
comments
Row names for the data frame indicate the Substance Registry Services (SRS) name and parameter units.
Many of the water-quality benchmarks were accessed from the U.S. Geological Survey Health-Based Screening Levels database, accessed on August 8, 2017, from https://water.usgs.gov/water-resources/hbsl/. Benchmarks for total Trihalomethanes, Tritium, and Strontium-90 were provided by the U.S. Environmental Protection Agency (2015). Note that MCL benchmark values reported in millirem per year were substituted with a 50 picocuries per liter screening level.
U.S. Environmental Protection Agency, 2015, Protection of environment—Code of Federal Regulations 40, Part 141, Subpart G, National Primary Drinking Water Regulations, Maximum Contaminant Levels and Maximum Residual Disinfectant Levels: Washington, D.C., Office of the Federal Register, National Archives and Records Administration.
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