Know Your Environment. Protect Your Health.

Chloroform

Jardines Del Valle

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.

 

13

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019N/A00N/A
20200.280 ppb21ND - 0.560 ppb
20210.285 ppb21ND - 0.570 ppb
20220.740 ppb43ND - 1.40 ppb
2023ND50ND

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
2020-07-06CA4400664_DST_801-202007061330ND
2020-08-05CA4400664_DST_801-2020080515000.560 ppb
2021-08-13CA4400664_DST_801-2021081312250.570 ppb
2021-12-28CA4400664_DST_801-202112281730ND
2022-03-31CA4400664_DST_801-2022033116300.930 ppb
2022-06-30CA4400664_DST_801-2022063013301.40 ppb
2022-09-28CA4400664_DST_801-2022092816250.630 ppb
2022-12-16CA4400664_DST_801-202212161300ND
2023-03-30CA4400664_DST_801-202303301105ND
2023-06-15CA4400664_DST_801-202306151255ND
2023-07-27CA4400664_DST_801-202307271230ND
2023-09-29CA4400664_DST_801-202309291145ND
2023-11-30CA4400664_DST_801-202311300930ND