1,2,4-Trichlorobenzene

City of Humble

1,2,4-Trichlorobenzene is an industrial solvent that can harm the adrenal glands and may increase the risk of cancer.

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2013	N/A	0	N/A
2014	N/A	0	N/A
2015	ND	5	ND
2016	ND	5	ND
2017	ND	5	ND
2018	ND	5	ND
2019	ND	5	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 5 ppb

The EWG Health Guideline of 5 ppb for 1,2,4-trichlorobenzene was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against hormone disruption.

EPA Maximum Contaminant
Level (MCL) 70 ppb

The legal limit for 1,2,4-trichlorobenzene, established in 1992, was based on a toxicity study in laboratory animals conducted in 1981. This limit may not fully protect against hormone disruption.

ppb = parts per billion

All test results

Date	Lab ID	Result
2015-01-20	AC76796	ND
2015-01-20	AC76784	ND
2015-01-20	AC76780	ND
2015-01-20	AC76800	ND
2015-01-20	AC76798	ND
2016-01-21	AD19313	ND
2016-01-21	AD19307	ND
2016-01-21	AD19315	ND
2016-01-21	AD19317	ND
2016-01-21	AD19309	ND
2017-01-05	AD63235	ND
2017-01-05	AD63231	ND
2017-01-05	AD63233	ND
2017-01-05	AD63263	ND
2017-04-21	AD80683	ND
2018-01-19	AE09579	ND
2018-01-19	AE09595	ND
2018-01-19	AE09539	ND
2018-04-03	AE21021	ND
2018-04-03	AE21019	ND
2019-01-15	AE49863	ND
2019-01-15	AE49877	ND
2019-01-15	AE49873	ND
2019-01-15	AE49879	ND
2019-01-15	AE49853	ND