Know Your Environment. Protect Your Health.

Chloroform

Minerva 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.

 

31

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.220 ppb51ND - 1.10 ppb
20190.200 ppb51ND - 1.000 ppb
20200.220 ppb51ND - 1.10 ppb
2021ND50ND
20220.333 ppb61ND - 2.00 ppb
20230.400 ppb51ND - 2.00 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
2018-01-25AE10642ND
2018-01-25AE10487ND
2018-06-11AE29221ND
2018-08-20AE37581ND
2018-10-10AE430121.10 ppb
2019-02-05AE52844ND
2019-02-05AE52931ND
2019-05-15AE66478ND
2019-07-02AE730881.000 ppb
2019-10-17AE86876ND
2020-02-11AE97849ND
2020-04-14AF06550ND
2020-04-14AF06560ND
2020-07-15AF193951.10 ppb
2020-10-19AF31082ND
2021-01-20AF40037ND
2021-04-14AF50118ND
2021-04-14AF50154ND
2021-08-26AF68096ND
2021-11-17AF76861ND
2022-01-27AF82191ND
2022-01-27AF82247ND
2022-01-27AF82248ND
2022-04-20AF93880ND
2022-09-15AG13173ND
2022-10-25AG182792.00 ppb
2023-03-01AG30934ND
2023-05-09AG39683ND
2023-08-01AG507852.00 ppb
2023-10-17AG60028ND
2023-10-17AG60113ND