Know Your Environment. Protect Your Health.

Chloroform

Chamberino Mdwc & Sa

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.905 ppb220.820 ppb - 0.990 ppb
20190.745 ppb220.680 ppb - 0.810 ppb
20200.450 ppb220.370 ppb - 0.530 ppb
20210.505 ppb220.470 ppb - 0.540 ppb
20220.255 ppb220.160 ppb - 0.350 ppb
20230.765 ppb220.330 ppb - 1.20 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
2018-07-1820180197160.820 ppb
2018-08-0820180222410.990 ppb
2019-07-1520190193300.810 ppb
2019-08-1220190223850.680 ppb
2020-07-0720201899610.370 ppb
2020-08-1120202855400.530 ppb
2021-07-0720211342810.540 ppb
2021-08-1120211479400.470 ppb
2022-07-1120221017820.160 ppb
2022-08-1020221150770.350 ppb
2023-07-0520230309881.20 ppb
2023-08-1520230352620.330 ppb