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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Rockingham County 158 Corridor

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

 

49

Samples

0

Samples exceeding legal limit (MCL)

15

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.367 ppb62ND - 1.10 ppb
20150.825 ppb85ND - 1.70 ppb
20161.10 ppb84ND - 3.10 ppb
2017ND90ND
2018ND80ND
20190.500 ppb104ND - 1.40 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
2014-02-2792191331001ND
2014-05-1592201499001TTH1.10 ppb
2014-05-1592201499001DIS1.10 ppb
2014-08-2192214343002ND
2014-11-2592227049001TTHND
2014-11-2592227049002TTHND
2015-02-11ND
2015-02-111.20 ppb
2015-05-131.20 ppb
2015-05-131.20 ppb
2015-08-111.70 ppb
2015-08-111.30 ppb
2015-11-19ND
2015-11-19ND
2016-02-2492287563001TTHND
2016-02-2492287563004TTHND
2016-05-1992298220001TTH3.00 ppb
2016-05-1992298220004TTH3.10 ppb
2016-08-1192308435001TTH1.60 ppb
2016-08-1192308435003TTH1.10 ppb
2016-11-2892320985002TTHND
2016-11-2892320985003TTHND
2017-02-2392331186001TTHND
2017-02-2392331186003TTHND
2017-05-2492341647001TTHND
2017-05-2492341647004TTHND
2017-05-2492341647003TTHND
2017-08-1792351850001TTHND
2017-08-1792351850003TTHND
2017-11-1692363666002TTHND
2017-11-1692363666003TTHND
2018-02-1392373241004TTH ND
2018-02-1392373241001TTH ND
2018-05-3192386739001TTH ND
2018-05-3192386739003TTH ND
2018-08-1692396080002TTH ND
2018-08-1692396080003TTH ND
2018-11-0892406544002TTH ND
2018-11-0892406544003TTH ND
2019-03-1492421294001_3770ND
2019-03-1492421294005_3770ND
2019-05-1592429495001_37701.30 ppb
2019-05-1692429495004_37701.000 ppb
2019-07-1192436428001_K ND
2019-07-1192436428002_K ND
2019-08-2292442477001_37701.30 ppb
2019-08-2292442477004_37701.40 ppb
2019-11-1492453832004_3770ND
2019-11-1492453832001_3770ND