Update: March 1993
Current Massachusetts Regulatory Limit
MMCL = 0.0002 mg/L. ORS has adopted the MCL published by the U.S. EPA as part of the Phase II rule (56 FR 3526; 1-30-91).
Federal Regulatory Limit
The MCL for 1,2-dibromo-3-chloropropane is based on its detection limit of 0.0002 mg/L. The MCLG is equal to zero.
Basis for Criteria
The U.S. EPA currently classifies DBCP as a B2 carcinogen and therefore establishes an MCLG of zero. The MCL is established as close to the MCLG as feasible, therefore, the regulatory limit is set at the PQL of 0.0002 mg/L.
Non-cancer effects that are associated with exposures to DBCP include hepatic, CNS, and testicular effects.
There is sufficient evidence from animal studies that exposure to DBCP causes an increase in tumors. There is currently no oral potency listed in IRIS (4-10-91).
PQL: The PQL used as the basis for the MCL is 0.0002 mg/L.
504 GC w/ microextract.
PQLs and analytical methods may have been updated since this guidance value was last revised. Updated analytical methods for drinking water and their associated PQLs may be found at http://www.epa.gov/safewater/methods/methods.html.
Other Regulatory Data
Any Health Advisories, Reference Doses (RfDs), cancer assessments or Cancer Potency Factors (CPFs) referenced in this document pertain to the derivation of the current guidance value. Updated information may be obtained from the following sources:
Health Advisories - The U.S. EPA provides guidance for shorter-term exposures for chemicals based on their non-cancer effects. Current health advisories may be more current than those used to derive MCLs and may be found at http://www.epa.gov/waterscience/drinking/standards/dwstandards.pdf.
RfDs, cancer assessments and CPFs - For specific information pertaining to derivation of drinking water criteria, consult the Federal Register notice that announces the availability of the most current guidance for that chemical. In addition, information on other current RfDs and CPFs as well as cancer assessments for specific chemicals may be found in the U.S. EPA Integrated Risk Information System (IRIS) at http://www.epa.gov/iris/. Please note that the information in IRIS may differ from that used in the derivation process as published in the Federal Register notice.
Federal Register. January 30, 1991. Part II. Environmental Protection Agency. 40 CFR Parts 141, 142, and 143. National Primary Drinking Water Regulations; Final Rule. (56 FR 3526).
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