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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

S S WSC

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.

MORE ABOUT THIS CONTAMINANT

 

33

Samples

0

Samples exceeding legal limit (MCL)

9

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.700 ppb41ND - 2.80 ppb
20150.600 ppb61ND - 3.60 ppb
20160.700 ppb62ND - 2.50 ppb
20170.233 ppb61ND - 1.40 ppb
20180.720 ppb52ND - 2.20 ppb
20191.05 ppb62ND - 4.60 ppb

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
2014-03-26AC48344ND
2014-09-08AC66064ND
2014-09-08AC66157ND
2014-09-08AC661562.80 ppb
2015-01-15AC76448ND
2015-01-15AC764523.60 ppb
2015-01-15AC76450ND
2015-01-15AC76454ND
2015-07-31AD02024ND
2015-07-31AD02023ND
2016-01-21AD19289ND
2016-01-21AD19283ND
2016-01-21AD192972.50 ppb
2016-01-21AD19295ND
2016-07-28AD46148ND
2016-07-28AD461491.70 ppb
2017-05-10AD83615ND
2017-05-10AD836141.40 ppb
2017-05-10AD83658ND
2017-05-10AD83656ND
2017-05-10AD83648ND
2017-05-10AD83650ND
2018-07-02AE32160ND
2018-07-02AE321591.40 ppb
2018-07-02AE32233ND
2018-07-02AE32229ND
2018-07-02AE322312.20 ppb
2019-03-28AE60474ND
2019-03-28AE60480ND
2019-03-28AE604784.60 ppb
2019-03-28AE60472ND
2019-06-20AE714431.70 ppb
2019-06-20AE71448ND