Know Your Environment. Protect Your Health.

Chloroform

California Water Service Company-Lancaster

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.

 

48

Samples

0

Samples exceeding legal limit (MCL)

10

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.72 ppb84ND - 5.90 ppb
2019ND80ND
2020ND80ND
20210.513 ppb82ND - 3.00 ppb
20220.254 ppb82ND - 1.40 ppb
20235.00 ppb82ND - 23.0 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
2018-02-13CA1910010_DST_800-2018021315575.90 ppb
2018-02-13CA1910010_DST_801-2018021315484.20 ppb
2018-05-15CA1910010_DST_801-2018051509451.47 ppb
2018-05-15CA1910010_DST_800-2018051509452.15 ppb
2018-08-14CA1910010_DST_801-201808141002ND
2018-08-14CA1910010_DST_800-201808141002ND
2018-11-13CA1910010_DST_801-201811131005ND
2018-11-13CA1910010_DST_800-201811131004ND
2019-02-12CA1910010_DST_800-201902121517ND
2019-02-12CA1910010_DST_801-201902121547ND
2019-05-14CA1910010_DST_801-201905141014ND
2019-05-14CA1910010_DST_800-201905141014ND
2019-08-13CA1910010_DST_800-201908131449ND
2019-08-13CA1910010_DST_801-201908131513ND
2019-11-12CA1910010_DST_801-201911121040ND
2019-11-12CA1910010_DST_800-201911121058ND
2020-02-11CA1910010_DST_800-202002110954ND
2020-02-11CA1910010_DST_801-202002110929ND
2020-05-12CA1910010_DST_800-202005121222ND
2020-05-12CA1910010_DST_801-202005121235ND
2020-08-18CA1910010_DST_801-202008181455ND
2020-08-18CA1910010_DST_800-202008181430ND
2020-11-09CA1910010_DST_800-202011091521ND
2020-11-09CA1910010_DST_801-202011091501ND
2021-02-08CA1910010_DST_800-202102081201ND
2021-02-08CA1910010_DST_801-202102081152ND
2021-05-11CA1910010_DST_800-202105111405ND
2021-05-11CA1910010_DST_801-2021051114403.00 ppb
2021-08-10CA1910010_DST_801-202108101503ND
2021-08-10CA1910010_DST_800-202108101432ND
2021-11-08CA1910010_DST_801-2021110810331.10 ppb
2021-11-08CA1910010_DST_800-202111081141ND
2022-02-15CA1910010_DST_800-202202151408ND
2022-02-15CA1910010_DST_800-2022021514180.630 ppb
2022-05-10CA1910010_DST_801-202205101413ND
2022-05-10CA1910010_DST_800-202205101318ND
2022-08-09CA1910010_DST_801-2022080915221.40 ppb
2022-08-09CA1910010_DST_800-202208091541ND
2022-11-15CA1910010_DST_801-202211150935ND
2022-11-15CA1910010_DST_800-202211150956ND
2023-02-14CA1910010_DST_800-202302141031ND
2023-02-14CA1910010_DST_801-202302140925ND
2023-05-09CA1910010_DST_801-20230509143623.0 ppb
2023-05-09CA1910010_DST_800-202305091343ND
2023-08-15CA1910010_DST_801-20230815121017.0 ppb
2023-08-15CA1910010_DST_800-202308151156ND
2023-11-14CA1910010_DST_801-202311141231ND
2023-11-14CA1910010_DST_800-202311141052ND