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The Environmental Protection Agency (EPA) have set out risk standards for most chemicals which may be released into the environment. The risk of each chemical is equivalent to the risk involved with the following activities:
To meet these risk standards, the maximum acceptable levels of the main contaminants at the PGDP, TCE and Tc99, are 5 ug/L and 900 piCu/L, respectively. Another contaminant of interest are PCBs, which have a minimum concentration level of 0.0005 parts per million.
More information on EPA standards for drinking water for various chemicals and microorganisms can be found at water.epa.gov/drink/contaminants/index.cfm