1,2,4-Trichlorobenzene

City of Stockton

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	ND	2	ND
2015	N/A	0	N/A
2016	ND	15	ND
2017	N/A	0	N/A
2018	N/A	0	N/A
2019	ND	12	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
2014-06-04	5810-094-0900	ND
2014-11-18	5810-084-0940	ND
2016-08-17	5867-037-1100	ND
2016-08-17	5867-040-1130	ND
2016-08-17	5867-038-1030	ND
2016-08-18	5867-100-0940	ND
2016-08-18	5867-046-0830	ND
2016-08-18	5867-098-0900	ND
2016-08-18	5867-092-1020	ND
2016-08-24	5867-094-0930	ND
2016-08-24	5867-083-1100	ND
2016-08-24	5867-084-1015	ND
2016-08-24	5867-087-0830	ND
2016-08-25	5867-003-0927	ND
2016-08-25	5867-089-1030	ND
2016-08-25	5867-055-1101	ND
2016-09-07	5867-096-0840	ND
2019-08-06	1610-092-0910	ND
2019-08-06	1610-096-1000	ND
2019-08-06	1610-046-0840	ND
2019-08-06	1610-098-0800	ND
2019-08-13	1610-084-1010	ND
2019-08-13	1610-087-0750	ND
2019-08-13	1610-083-1105	ND
2019-08-13	1610-055-1050	ND
2019-08-13	1610-094-0930	ND
2019-08-13	1610-040-0910	ND
2019-08-13	1610-037-0810	ND
2019-08-13	1610-038-0845	ND