Know Your Environment. Protect Your Health.

Chloroform

Firgrove Mutual Inc

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.

 

55

Samples

0

Samples exceeding legal limit (MCL)

31

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20183.10 ppb97ND - 14.1 ppb
20193.49 ppb86ND - 8.28 ppb
2020N/A00N/A
20211.89 ppb195ND - 11.0 ppb
20220.884 ppb116ND - 4.58 ppb
20231.47 ppb87ND - 4.74 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
2018-02-210.700 ppb
2018-02-216.10 ppb
2018-05-08ND
2018-06-050.570 ppb
2018-06-051.32 ppb
2018-09-11ND
2018-09-111.22 ppb
2018-12-1114.1 ppb
2018-12-113.91 ppb
2019-02-194.18 ppb
2019-02-19ND
2019-06-196.10 ppb
2019-06-191.58 ppb
2019-09-10ND
2019-09-103.70 ppb
2019-12-038.28 ppb
2019-12-034.11 ppb
2021-03-084087500ND
2021-03-084087501ND
2021-04-224106995ND
2021-04-224106996ND
2021-04-224109492ND
2021-05-034115218ND
2021-05-034115220ND
2021-05-044115219ND
2021-05-264122785ND
2021-05-264122784ND
2021-06-104131663ND
2021-06-104131887ND
2021-06-1041316641.02 ppb
2021-08-164163794ND
2021-09-1441798738.87 ppb
2021-09-14417987411.0 ppb
2021-10-134191674ND
2021-12-0942165997.34 ppb
2021-12-0942166007.67 ppb
2022-03-044258476ND
2022-03-0942580210.920 ppb
2022-03-0942580224.58 ppb
2022-03-284268782ND
2022-04-204274621ND
2022-06-1442997080.560 ppb
2022-06-144299709ND
2022-09-1343631260.620 ppb
2022-09-1443631281.56 ppb
2022-12-064390356ND
2022-12-0743903511.48 ppb
2023-03-1444330734.74 ppb
2023-03-1444330742.55 ppb
2023-05-0944552210.690 ppb
2023-05-0944552220.660 ppb
2023-09-114525794ND
2023-09-1145257951.04 ppb
2023-10-1045391421.000 ppb
2023-10-1045391411.06 ppb