Know Your Environment. Protect Your Health.

Chloroform

Miller Grove Water Supply Corporation

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.

 

61

Samples

0

Samples exceeding legal limit (MCL)

39

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.711 ppb105ND - 1.66 ppb
20191.18 ppb109ND - 1.58 ppb
20201.36 ppb119ND - 2.73 ppb
20211.11 ppb105ND - 3.06 ppb
20220.586 ppb104ND - 1.83 ppb
20230.882 ppb107ND - 1.76 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
2018-02-06Q1804518002ND
2018-02-06Q1804518001ND
2018-04-12Q1815139007ND
2018-04-12Q1815139009ND
2018-04-12Q1815139018ND
2018-04-12Q18151390021.43 ppb
2018-07-26Q18298250011.11 ppb
2018-07-26Q18298250021.56 ppb
2018-11-05Q18440330011.66 ppb
2018-11-05Q18440330021.35 ppb
2019-02-28Q19087790011.36 ppb
2019-02-28Q19087790021.57 ppb
2019-05-13Q19238680011.50 ppb
2019-05-13Q19238680021.58 ppb
2019-05-13Q1923868005ND
2019-05-13Q19238680071.29 ppb
2019-09-19Q19671270011.23 ppb
2019-09-19Q19671270021.09 ppb
2019-11-06Q19756720011.12 ppb
2019-11-06Q19756720021.06 ppb
2020-03-30Q20129140011.63 ppb
2020-03-30Q20129140021.41 ppb
2020-05-26Q20206320011.50 ppb
2020-05-26Q20206320071.21 ppb
2020-05-26Q20206320081.42 ppb
2020-05-26Q2020632009ND
2020-07-21Q20288430011.29 ppb
2020-07-21Q20288430021.43 ppb
2020-07-21Q2028843003ND
2020-12-03Q20484610022.34 ppb
2020-12-03Q20484610012.73 ppb
2021-03-30Q21079520133.06 ppb
2021-03-30Q21079520142.68 ppb
2021-05-20Q21132760011.89 ppb
2021-05-20Q21132760022.19 ppb
2021-09-13Q2124803001ND
2021-09-13Q2124803002ND
2021-11-03Q2130890001ND
2021-11-03Q21308900031.26 ppb
2021-11-03Q2130890005ND
2021-11-03Q2130890006ND
2022-02-16Q2205791003ND
2022-02-16Q22057910051.83 ppb
2022-02-16Q2205791009ND
2022-02-16Q2205791010ND
2022-04-21Q2212190001ND
2022-04-21Q2212190002ND
2022-07-14Q22202980011.19 ppb
2022-07-14Q2220298002ND
2022-10-04Q22300700011.61 ppb
2022-10-04Q22300700021.23 ppb
2023-02-21Q2307043001ND
2023-02-21Q23070430021.31 ppb
2023-05-02Q23164740011.21 ppb
2023-05-02Q23164740021.17 ppb
2023-07-18Q23279970041.06 ppb
2023-07-18Q23279970051.05 ppb
2023-07-18Q2327997006ND
2023-07-18Q23279970081.76 ppb
2023-10-11Q2343404001ND
2023-10-11Q23434040021.26 ppb