Know Your Environment. Protect Your Health.

Chloroform

Jblm Mcchord Field

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.

 

26

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20183.08 ppb42ND - 9.00 ppb
20192.50 ppb32ND - 6.90 ppb
2020N/A00N/A
20211.71 ppb71ND - 12.0 ppb
20220.743 ppb42ND - 2.34 ppb
20230.201 ppb81ND - 1.61 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
2018-08-13ND
2018-08-139.00 ppb
2018-08-143.30 ppb
2018-08-14ND
2019-07-316.90 ppb
2019-07-310.600 ppb
2019-07-31ND
2021-04-074213550ND
2021-04-074213549ND
2021-08-31416619412.0 ppb
2021-08-314166423ND
2021-11-174207231ND
2021-11-194207599ND
2021-11-194207598ND
2022-04-064274425ND
2022-08-0443332032.34 ppb
2022-08-0443331990.630 ppb
2022-09-284370669ND
2023-04-134441715ND
2023-05-034452074ND
2023-06-144470352ND
2023-06-144470351ND
2023-06-154470350ND
2023-08-0945058671.61 ppb
2023-08-094505871ND
2023-09-064514768ND