Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Chloroform

Rancho San Vicente

NOTE: Rancho San Vicente purchases water from Bella Vista which is required to test for chloroform. Sample information shown below was taken by Bella Vista.

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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015ND50ND
2016ND10ND
2017ND10ND
2018ND10ND
2019ND30ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

NOTE: Rancho San Vicente purchases water from Bella Vista which is required to test for chloroform. Sample information shown below was taken by Bella Vista.

Date Lab ID Result
2015-02-24AC81679ND
2015-06-18AC96494ND
2015-06-18AC96573ND
2015-09-09AD06195ND
2015-10-08AD10034ND
2016-06-23AD41668ND
2016-06-23AD41647ND
2017-05-11AD83989ND
2017-05-11AD83942ND
2017-05-11AD83943ND
2018-07-24AE34341ND
2018-07-24AE34310ND
2018-07-24AE34312ND
2019-09-11AE83029ND
2019-09-11AE82949ND
2019-09-11AE82951ND