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National Drinking Water Database

National Drinking Water Database - Chemical Contaminants


Status: Unregulated - EPA has not established a maximum legal limit in tapwater for this contaminant.

delta-BHC (benzene hexachloride) is an insecticide formerly used on fruit, vegetable and forest crops.

Found above
health guidelines
Found above
legal limit
Water utilities
People Served

Health Concerns for delta-BHC:

delta-BHC Exposure by State

Water utilities in 1 states have reported detecting delta-BHC in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with delta-BHC contamination

The Most Polluted Communities

1 water utilities reported detecting delta-BHC in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average delta-BHC level

RankSystem Population Served Positive test results of total reported tests Average Level
1Artesian Water Company
Newark, DE
201,0001 of 83< 0.01 ppb
(0 to 0.02 ppb)

Testing Summary for delta-BHC

Are tests routinely required for delta-BHC by federal law?No
Water suppliers reporting tests for delta-BHC (2004-2009):1,074 of 47,576
Average testing rate for water supplier reporting tests (2004-2009):0.3 per year


Type of concern: Reference:
Cancer - not classifiable/not likely to be human carcinogen EPA Integrated Risk Information System (IRIS)

Government, industry, academic studies and classifications

government/industry list/academic study appears on list as classification(s)
EPA Integrated Risk Information System (IRIS)DELTA-HEXACHLOROCYCLOHEXANE (DELTA-HCH)•Group D: Not classifiable as to human carcinogenicity (EPA classification)


government/industry list/academic study reference
EPA Integrated Risk Information System (IRIS)EPA (U.S. Environmental Protection Agency). 2008. Integrated Risk Information System (IRIS). Evidence for human carcinogenicity based on 1986-2005 guidelines.

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