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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Armstrong Psd

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

 

24

Samples

0

Samples exceeding legal limit (MCL)

12

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.966 ppb53ND - 3.21 ppb
20150.295 ppb42ND - 0.700 ppb
20160.165 ppb42ND - 0.360 ppb
20170.193 ppb41ND - 0.770 ppb
20180.458 ppb43ND - 0.990 ppb
20190.140 ppb31ND - 0.420 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
2014-02-11S2THM_1402A02-04ND
2014-02-111402A02-04A3.21 ppb
2014-05-06S2THM_1405472-07ND
2014-08-11S2THM_1408C20-040.820 ppb
2014-11-11S2THM_1411B42-040.800 ppb
2015-02-10S2THM_1502A36-03ND
2015-05-12S2THM_1505C59-030.480 ppb
2015-08-11S2THM_1508B33-010.700 ppb
2015-11-101511B36-06AND
2016-02-081602B37-04AND
2016-05-1016051027-03AND
2016-08-0916081123-03A0.360 ppb
2016-11-1516111768-03A0.300 ppb
2017-02-0717020754-03AND
2017-05-0917051088-03AND
2017-08-1417082144-01A0.770 ppb
2017-11-0717110853-03AND
2018-02-1318022452-03A0.990 ppb
2018-05-0818051050-01AND
2018-08-0718080936-04A0.540 ppb
2018-11-1318111592-03A0.300 ppb
2019-02-1219021251-03AND
2019-05-1419051967-04A0.420 ppb
2019-08-1335491077001ND