Know Your Environment. Protect Your Health.

Chloroform

City of Commerce

Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Read More.

In addition to tap water disinfection, chloroform pollution in the environment also comes from industrial discharges from pulp and paper mills, and from urban wastewater effluent. Human studies show that chloroform damages the kidneys, liver and central nervous system. In animals, chloroform causes infertility, birth defects and cancer.

Click here to read more about disinfection byproducts.

 

60

Samples

0

Samples exceeding legal limit (MCL)

46

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201823.5 ppb108ND - 55.9 ppb
201929.3 ppb108ND - 74.4 ppb
20207.24 ppb107ND - 15.7 ppb
20217.63 ppb108ND - 15.6 ppb
20226.25 ppb107ND - 14.4 ppb
20236.85 ppb108ND - 15.1 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was based on the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer and harm to fetal growth and development.

ppb = parts per billion

All test results

Date Lab ID Result
2018-02-14Q18062360044.49 ppb
2018-02-14Q1806236001ND
2018-02-14Q180623600527.2 ppb
2018-06-04Q18220470038.08 ppb
2018-06-04Q182204700537.4 ppb
2018-06-04Q182204700948.6 ppb
2018-08-09Q1831967002ND
2018-08-09Q183196700355.9 ppb
2018-11-06Q18443150022.01 ppb
2018-11-06Q184431500351.2 ppb
2019-02-21Q190774300338.2 ppb
2019-02-21Q1907743004ND
2019-02-21Q190774301451.5 ppb
2019-02-21Q190774301564.5 ppb
2019-05-06Q1920265002ND
2019-05-06Q192026500374.4 ppb
2019-09-23Q19674470023.82 ppb
2019-09-23Q196744700330.0 ppb
2019-12-16Q198008300212.7 ppb
2019-12-16Q198008300317.8 ppb
2020-02-12Q2005708002ND
2020-02-12Q200570800315.7 ppb
2020-05-07Q2018051005ND
2020-05-07Q2018051010ND
2020-05-07Q201805101114.2 ppb
2020-08-04Q203036100112.8 ppb
2020-08-04Q20303610081.68 ppb
2020-08-04Q203036100913.0 ppb
2020-11-02Q20423270018.52 ppb
2020-11-02Q20423270026.54 ppb
2021-01-27Q21020320036.36 ppb
2021-01-27Q21020320118.16 ppb
2021-01-27Q2102032005ND
2021-01-27Q21020320107.57 ppb
2021-05-06Q21117740019.06 ppb
2021-05-06Q21117740028.58 ppb
2021-09-07Q2124186002ND
2021-09-07Q212418600315.6 ppb
2021-11-03Q213089100210.3 ppb
2021-11-03Q213089100310.7 ppb
2022-02-10Q2204939002ND
2022-02-10Q2204939004ND
2022-02-10Q220493900514.4 ppb
2022-04-25Q2212345002ND
2022-04-25Q22123450037.62 ppb
2022-08-24Q222521000310.1 ppb
2022-08-24Q22252100028.16 ppb
2022-10-26Q22323380037.67 ppb
2022-10-26Q22323380131.51 ppb
2022-10-26Q223233801413.0 ppb
2023-02-15Q23062430036.08 ppb
2023-02-15Q2306243005ND
2023-02-15Q23062430142.27 ppb
2023-02-15Q230624301513.6 ppb
2023-05-30Q2319967002ND
2023-05-30Q231996700310.1 ppb
2023-08-21Q23351260012.89 ppb
2023-08-21Q233512600213.8 ppb
2023-11-28Q23505970024.69 ppb
2023-11-28Q235059700315.1 ppb