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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.

1,2,3-Trichlorobenzene is a solvent and an intermediate for chemical manufacturing that was used historically as an insecticide for termite control.

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

Health Concerns for 1,2,3-Trichlorobenzene:

1,2,3-Trichlorobenzene Exposure by State

Water utilities in 10 states have reported detecting 1,2,3-Trichlorobenzene in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with 1,2,3-Trichlorobenzene contamination
North Carolina419,723
New York32,705
New Mexico12,500

The Most Polluted Communities

22 water utilities reported detecting 1,2,3-Trichlorobenzene in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average 1,2,3-Trichlorobenzene level

RankSystem Population Served Positive test results of total reported tests Average Level
1Bedford Hills/Taconic Corr. Facilities
Bedford Hills, NY
1,1001 of 10.5 ppb
(0.5 ppb)
2Louisville,city of
Louisville, OH
8,5001 of 10.5 ppb
(0.5 ppb)
3Monroe Bay Trailer Park
Colonial Beach, VA
851 of 20.3 ppb
(0 to 0.6 ppb)
4Scottsboro Water Works
Scottsboro, AL
20,9611 of 40.23 ppb
(0 to 0.93 ppb)
5Wild Oaks Water Company
Rockport, NY
8051 of 30.17 ppb
(0 to 0.5 ppb)
6Berino Mdwca
Anthony, NM
2,5001 of 30.16 ppb
(0 to 0.49 ppb)
7Mcwa, Genesee West
Rochester, NY
8002 of 30.15 ppb
(0 to 0.3 ppb)
8Kings Village - Jcsa
Williamsburg, VA
1211 of 80.13 ppb
(0 to 1 ppb)
9Pepper Ridge S/D
Oak Ridge, NC
1271 of 150.12 ppb
(0 to 1.8 ppb)
10Knoll Woods/Ivy Acres
Moneta, VA
2501 of 70.11 ppb
(0 to 0.8 ppb)

Testing Summary for 1,2,3-Trichlorobenzene

Are tests routinely required for 1,2,3-Trichlorobenzene by federal law?No
Water suppliers reporting tests for 1,2,3-Trichlorobenzene (2004-2009):20,568 of 47,576
Average testing rate for water supplier reporting tests (2004-2009):0.6 per year

Organ system toxicity (non-reproductive)

Type of concern: Reference:
Classified as expected to be toxic or harmful Environment Canada Domestic Substance List


Type of concern: Reference:
One or more in vitro tests on mammalian cells show positive mutation results RTECS®- Mutagenesis 1987


Type of concern: Reference:
Suspected to be an environmental toxin and be persistent or bioaccumulative Environment Canada Domestic Substance List
Suspected to be an environmental toxin Environment Canada Domestic Substance List

Persistence and bioaccumulation

Type of concern: Reference:
Not suspected to be bioaccumulative Environment Canada Domestic Substance List

Government, industry, academic studies and classifications

government/industry list/academic study appears on list as classification(s)
Environment Canada Domestic Substance ListBENZENE, 1,2,3-TRICHLORO-•This chemical was flagged for further attention by CEPA due to suspected aquatic toxicity and persistence.
RTECS®- Mutagenesis 1987BENZENE, 1,2,3-TRICHLORO-• mutagenic - Positive mutation assay: Micronucleus test (mouse ipr)


government/industry list/academic study reference
Environment Canada Domestic Substance ListEC (Environment Canada). 2008. Domestic Substances List Categorization. Canadian Environmental Protection Act (CEPA) Environmental Registry.
RTECS®- Mutagenesis 1987RTECS®- Mutagenesis. (Oxford Univ. Press, Pinkhill House, Southfield Road, Eynsham, Oxford OX8 1JJ, UK) V.1- 2,111,1987

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