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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

Folsom Water Supply

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

26

Samples

0

Samples exceeding legal limit (MCL)

16

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.17 ppb64ND - 1.80 ppb
20152.00 ppb441.80 ppb - 2.20 ppb
20161.20 ppb42ND - 2.40 ppb
20171.000 ppb42ND - 2.00 ppb
20181.000 ppb42ND - 2.00 ppb
20190.900 ppb42ND - 1.80 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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

Date Lab ID Result
2014-05-19AD91606ND
2014-05-19AD91606ND
2014-12-0120130040021.70 ppb
2014-12-0120130040011.80 ppb
2014-12-0120130040021.70 ppb
2014-12-0120130040011.80 ppb
2015-09-2220260000021.80 ppb
2015-09-2220260000012.20 ppb
2015-09-2220260000021.80 ppb
2015-09-2220260000012.20 ppb
2016-09-132042589001ND
2016-09-132042589001ND
2016-09-1320425880012.40 ppb
2016-09-1320425880012.40 ppb
2017-09-11353356050072.00 ppb
2017-09-1135335605008ND
2017-09-11353356050072.00 ppb
2017-09-1135335605008ND
2018-09-19354191320022.00 ppb
2018-09-1935419132001ND
2018-09-1935419132001ND
2018-09-19354191320022.00 ppb
2019-09-0535495474001ND
2019-09-05354954740021.80 ppb
2019-09-0535495474001ND
2019-09-05354954740021.80 ppb