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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.

trans-1,4-Dichloro-2-butene is an intermediate used in the manufacture of other chemicals such as hexamethylenediamine and chloroprene.

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

Health Concerns for trans-1,4-Dichloro-2-butene:

trans-1,4-Dichloro-2-butene Exposure by State

Water utilities in 1 states have reported detecting trans-1,4-Dichloro-2-butene in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with trans-1,4-Dichloro-2-butene contamination
New Jersey132,500

The Most Polluted Communities

1 water utilities reported detecting trans-1,4-Dichloro-2-butene in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average trans-1,4-Dichloro-2-butene level

RankSystem Population Served Positive test results of total reported tests Average Level
1Morris County Mua
Randolph Twp, NJ
32,5001 of 30.23 ppb
(0 to 0.68 ppb)

Testing Summary for trans-1,4-Dichloro-2-butene

Are tests routinely required for trans-1,4-Dichloro-2-butene by federal law?No
Water suppliers reporting tests for trans-1,4-Dichloro-2-butene (2004-2009):305 of 47,576
Average testing rate for water supplier reporting tests (2004-2009):0.8 per year


Type of concern: Reference:
Cancer - not classifiable/not likely to be human carcinogen Int'l Agency for Research on Cancer (IARC) - Carcinogens

Government, industry, academic studies and classifications

government/industry list/academic study appears on list as classification(s)
Int'l Agency for Research on Cancer (IARC) - CarcinogensTRANS-1,4-DICHLOROBUTENE•IARC Group 3 (no cancer link)


government/industry list/academic study reference
Int'l Agency for Research on Cancer (IARC) - CarcinogensIARC (International Agency for Research on Cancer). 2008. Overall Evaluations of Carcinogenicity to Humans, as evaluated in IARC Monographs Volumes 1-99 (a total of 935 agents, mixtures and exposures).

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