Know Your Environment. Protect Your Health.

Chloroform

Hillview Water Company-oakhurst/sierra Lakes

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)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.80 ppb111.80 ppb
2019ND10ND
20200.433 ppb31ND - 1.30 ppb
2021ND20ND
2022ND20ND
20230.700 ppb21ND - 1.40 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
2018-06-12CA2010007_DST_900-2018061210171.80 ppb
2019-06-18CA2010007_DST_900-201906181551ND
2020-06-16CA2010007_DST_900-20200616NULND
2020-08-20CA2010007_DST_902-2020082013131.30 ppb
2020-08-20CA2010007_DST_901-202008201255ND
2021-06-15CA2010007_DST_902-202106151226ND
2021-06-15CA2010007_DST_901-202106151213ND
2022-06-13CA2010007_DST_901-202206130905ND
2022-06-13CA2010007_DST_902-202206131108ND
2023-06-12CA2010007_DST_901-2023061209451.40 ppb
2023-06-12CA2010007_DST_902-202306121155ND