Know Your Environment. Protect Your Health.

Chloroform

Lakewood Water District

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.

 

35

Samples

0

Samples exceeding legal limit (MCL)

9

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.191 ppb102ND - 1.45 ppb
20190.225 ppb132ND - 1.90 ppb
2020N/A00N/A
20210.155 ppb41ND - 0.620 ppb
20220.203 ppb62ND - 0.620 ppb
20230.810 ppb220.780 ppb - 0.840 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
2018-03-22ND
2018-07-12ND
2018-07-12ND
2018-07-12ND
2018-07-25ND
2018-07-25ND
2018-07-25ND
2018-08-27ND
2018-09-191.45 ppb
2018-09-190.460 ppb
2019-06-19ND
2019-06-19ND
2019-06-19ND
2019-06-19ND
2019-06-19ND
2019-06-19ND
2019-06-211.90 ppb
2019-06-21ND
2019-06-21ND
2019-06-21ND
2019-07-23ND
2019-09-111.02 ppb
2019-09-11ND
2021-05-054115227ND
2021-05-054115955ND
2021-09-074179888ND
2021-09-0741798890.620 ppb
2022-05-114286297ND
2022-05-114286299ND
2022-05-114286300ND
2022-08-114331437ND
2022-09-2743704970.600 ppb
2022-09-2743704940.620 ppb
2023-09-1445258010.840 ppb
2023-09-1445258000.780 ppb