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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Hemlock Mutual Water Company

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)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND40ND
2015ND40ND
20160.250 ppb41ND - 1.000 ppb
20170.550 ppb41ND - 2.20 ppb
20180.275 ppb41ND - 1.10 ppb
20190.425 ppb41ND - 1.70 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
2014-07-319588-801-1345ND
2014-07-319588-800-1355ND
2014-09-029588-002-1040ND
2014-09-029588-001-1030ND
2015-07-289588-801-1140ND
2015-07-289588-800-1155ND
2015-09-039588-001-1040ND
2015-09-039588-002-1025ND
2016-07-289588-801-1035ND
2016-07-289588-800-10451.000 ppb
2016-09-069588-001-0840ND
2016-09-069588-002-0830ND
2017-07-289588-800-15302.20 ppb
2017-07-289588-801-1515ND
2017-09-059588-002-1130ND
2017-09-059588-001-1145ND
2018-07-259588-800-14451.10 ppb
2018-07-259588-801-1500ND
2018-09-069588-002-0850ND
2018-09-069588-001-0910ND
2019-07-259588-800-11401.70 ppb
2019-07-259588-801-1130ND
2019-09-099588-002-1025ND
2019-09-099588-001-1030ND