DRINKING WATER REGULATIONS
    AND HEALTH ADVISORIES
                   by
              Office of Water
     U.S. Environmental Protection Agency
             Washington, D.C.
               202-260-7571
      SAFE DRINKING WATER HOTLINE
              1-800-426-4791
  Monday thru Friday, 9:00 AM to 5:30 PM EST
              November 1994
                           j
                           (/L
                           XZl
                               Recyclad/Rocydable
                               contains at least 50% ncytiedtter

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                                    LEGEND
 Abbreviations column descriptions are:
 MCLG -
 MCL
RfD
DWEL
         Maximum Contaminant Level Goal. A non-enforceable concentration
         of a drinking water contaminant that is protective of adverse human
         health effects and allows an adequate margin of safety.

         Maximum Contaminant Level.  Maximum permissible level of a
         contaminant in water which is delivered to any user of a public water
         system.

         Reference Dose. An estimate of a daily exposure to the human
         population that is likely to be without appreciable risk of deleterious
         effects over a lifetime.

         Drinking Water Equivalent Level. A lifetime exposure concentration
         protective of adverse, non-cancer health effects, that assumes all of
         the exposure to a contaminant is from a drinking water source.
(*) The codes for the Status Reg and Status HA columns are as follows:
  F
  D
  L
  P
  T
        final
        draft
        listed for regulation
        proposed
        tentative
Other codes found in the table include the following:
 NA
 PS
        not applicable
        performance standard 0.5 NTU - 1.0 NTU
        treatment technique

        No more than 5% of the samples per month may be positive.  For
        systems collecting fewer than 40 samples/month, no more than 1
        sample per month may be positive.

        guidance

Large discrepancies between Lifetime and Longer-term HA values may occur
because of the Agency's conservative policies, especially with regard to
carcinogenicity,  relative source  contribution, and less than lifetime exposures in
chronic toxicity testing.  These factors can result in a cumulative UF
(uncertainty factor) of 10 to 1000 when calculating a Lifetime HA.

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   "  ' The scheme for categorizing chemicals according to their carcinogenic potential
      is as follows: *         .

      Group A:  Human carcinogen

      Sufficient evidence in epidemiologic studies to support causal association
      between exposure and cancer

      Group B:  Probable human carcinogen

      Limited evidence in epidemiologic studies (Group B1) and/or sufficient
      evidence from animal studies (Group B2)

      Group C:  Possible human carcinogen

      Limited evidence from animal studies and inadequate or no data in humans

      Group D:  Not classifiable

      Inadequate or no human  and animal evidence of carcinogenicity

      Group E:  No evidence of carcinogenicitv for humans

      No evidence  of carcinogenicity in at least two adequate animal tests in different.
      species or in adequate epidemiologic and animal studies

   Drinking Water Health Advisories (HAs) are defined as follows:

      One-day HA

      The concentration of a  chemical in  drinking water that is not expected to cause
      any adverse noncarcinogenic effects for up to 5 consecutive days of exposure,
      with a margin of safety.

      Ten-day HA

      The concentration of a  chemical in  drinking water that is not expected to cause
      any adverse noncarcinogenic effects up to 14 consecutive days of exposure,
      with a margin of safety.

      Long-term HA

      The concentration of a  chemical in  drinking water that is not expected to cause
      any adverse noncarcinogenic effects up to approximately 7  yr (10% of an
      individual's lifetime) of exposure, with a margin of safety.

*EPA is  in the process of revising the Cancer Guidelines.

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Lifetime HA
                                                       j

The concentration of a chemical in drinking water that is not expected to cause
any adverse noncarcinogenic effects over a lifetime of exposure, with a margin
of safety.

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