Know Your Environment. Protect Your Health.

Chloroform

Mesa Grande 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.

 

11

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
20193.47 ppb31ND - 10.4 ppb
20202.85 ppb21ND - 5.69 ppb
20212.39 ppb221.42 ppb - 3.36 ppb
2022N/A00N/A
20230.550 ppb21ND - 1.10 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
2018-10-01Q1838902008ND
2018-10-01Q1838902010ND
2019-09-23Q1967401003ND
2019-09-23Q196740100510.4 ppb
2019-09-23Q1967401011ND
2020-08-03Q2030173001ND
2020-08-03Q20301730035.69 ppb
2021-06-03Q21144210063.36 ppb
2021-06-03Q21144210101.42 ppb
2023-11-21Q2350122001ND
2023-11-21Q23501220031.10 ppb