1,2,4-Trichlorobenzene

San Antonio Water Company

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
2014	N/A	0	N/A
2015	N/A	0	N/A
2016	ND	11	ND
2017	N/A	0	N/A
2018	N/A	0	N/A
2019	ND	10	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
2016-07-19	3761-001-0945	ND
2016-07-19	3761-018-1122	ND
2016-07-19	3761-017-1143	ND
2016-07-19	3761-003-1215	ND
2016-07-19	3761-013-1153	ND
2016-07-19	3761-011-1228	ND
2016-07-26	3761-021-1200	ND
2016-07-26	3761-016-1352	ND
2016-07-26	3761-010-0908	ND
2016-07-26	3761-004-0940	ND
2016-07-26	3761-002-1030	ND
2019-07-15	3761-010-1945	ND
2019-07-16	3761-011-1250	ND
2019-07-16	3761-013-1350	ND
2019-07-16	3761-003-1305	ND
2019-07-16	3761-016-1200	ND
2019-07-16	3761-002-1140	ND
2019-07-16	3761-017-1330	ND
2019-07-16	3761-018-1130	ND
2019-07-16	3761-001-1100	ND
2019-07-17	3761-004-0800	ND