Know Your Environment. Protect Your Health.

Chloroform

Lakeview Ranchettes

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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.830 ppb21ND - 1.66 ppb
2019ND30ND
2020ND20ND
20210.650 ppb21ND - 1.30 ppb
20221.96 ppb32ND - 3.77 ppb
20231.63 ppb221.61 ppb - 1.65 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
2018-02-22Q1807472003ND
2018-11-07Q18445970011.66 ppb
2019-03-27Q1912550003ND
2019-09-19Q1966930001ND
2019-09-19Q1966930004ND
2020-11-18Q2045700001ND
2020-11-18Q2045700004ND
2021-06-14Q2115431010ND
2021-06-14Q21154310121.30 ppb
2022-08-08Q22227420062.11 ppb
2022-08-08Q22227420083.77 ppb
2022-11-28Q2235191001ND
2023-11-13Q23483910011.61 ppb
2023-11-13Q23483910031.65 ppb