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Heptachlor Epoxide

CAS Number

1024-57-3

Synonym

Epoxyheptachlor; HCE;2,3,4,5,6,7,7-heptachloro-1a,1b,5,5a,6,6a-hexahydro-2,5-Methano-2H-indeno[1,2-b]oxirene; Epoxyheptachlor; HCE; 1,4,5,6,7,8,8-heptachloro-2,3-epoxy-3a,4,7,7a-tetrahydro-4,7-methanoindan; Epoxyheptachlor; 1,4,5,6,7,8,8-heptachloro-2,3-epoxy-3a,4,7,7a-tetrahydro-4,7-methanoindan; velsicol 53-cs-17

Occurrence/Use

Insecticide; degradation product of heptachlor. Commercial sale in the US banned in 1988; use restricted to control of fire ants in power transformers.

Heptachlor Epoxide

Child-Specific Reference Dose

Child-specific refence dose (chRD) (mg/kg-day, unless noted): 
1.3 E-5
Last chRD revision: 
12/2005
chRD Comments: 

Cancer Potency Information

Inhalation Slope Factor (mg/kg-day)-1: 
5.5 E+0
Oral Slope Factor (mg/kg-day)-1: 
5.5 E+0
Comments/References: 

OEHHA 1999. Public Health Goal for Heptachlor and Heptachlor Epoxide in Drinking Water.

Note: Geometric mean. LMS. surface area scaling factor of body weight to the 0.67 power. For Proposition 65 the number in regulation for both inhalation and oral is 9.1.

Proposition 65

Chemical Status

Cancer: 
Currently listed

Cancer

Listed as causing: 
Cancer
Date of Listing: 
07/01/1988
Basis for Listing: 
State's Qualified Experts

Safe Harbor Levels

Cancer
No Significant Risk Level (NSRL): 
0.08 µg/day

Water

California Public Health Goals Data

Health Risk Category: 
Carcinogenicity
Public Health Goal (mg/L): 
0.000006
Public Health Goal - Download: 
Cancer Risk at PHG: 
0.000001
MCL value (mg/L): 
0.00001
Cancer Risk at MCL: 
0.000002
Last PHG Revision : 
1999
California PHG Comments: