Know Your Environment. Protect Your Health.

Chloroform

Pleasant Hill Village Public Water System

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.600 ppb21ND - 1.20 ppb
20193.40 ppb221.60 ppb - 5.20 ppb
20201.05 ppb220.900 ppb - 1.20 ppb
20210.500 ppb220.300 ppb - 0.700 ppb
20220.650 ppb220.200 ppb - 1.10 ppb
20230.250 ppb220.200 ppb - 0.300 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
2018-09-12A1806141821.20 ppb
2018-09-12A180614183ND
2019-09-049I00352-011.60 ppb
2019-09-049I00352-025.20 ppb
2020-09-090I01505-011.20 ppb
2020-09-090I01505-030.900 ppb
2021-09-151I02131-010.300 ppb
2021-09-151I02131-020.700 ppb
2022-08-242H03787-011.10 ppb
2022-08-242H03787-020.200 ppb
2023-09-133I01859-010.300 ppb
2023-09-133I01861-010.200 ppb