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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Oblates of St. Francis

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

 

10

Samples

0

Samples exceeding legal limit (MCL)

9

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.05 ppb440.700 ppb - 1.40 ppb
20150.905 ppb43ND - 1.90 ppb
20161.28 ppb111.28 ppb
20171.92 ppb111.92 ppb
2018N/A00N/A
2019N/A00N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for dibromochloromethane 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
2014-02-251071359_01_038190.700 ppb
2014-04-041071359_01_043721.000 ppb
2014-07-111071359_01_000131.40 ppb
2014-11-031071359_01_001661.10 ppb
2015-01-151071359_01_002200.900 ppb
2015-05-14E150035500010.820 ppb
2015-07-01E160000180011.90 ppb
2015-10-01E16001420001ND
2016-03-23E160035050011.28 ppb
2017-06-09E170048770011.92 ppb