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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Town of Christiansburg

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

36

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.331 ppb169ND - 0.700 ppb
20150.181 ppb164ND - 0.800 ppb
20160.206 ppb166ND - 0.600 ppb
20170.106 ppb163ND - 0.700 ppb
20180.144 ppb164ND - 0.600 ppb
20190.394 ppb1610ND - 0.800 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
2014-01-22E140102021ND
2014-01-22E140102027ND
2014-01-22E140102022ND
2014-01-22E140102026ND
2014-04-22E1404011700.500 ppb
2014-04-22E1404011740.500 ppb
2014-04-22E1404011640.500 ppb
2014-04-22E1404011620.500 ppb
2014-07-21E1407005990.700 ppb
2014-07-21E1407006000.700 ppb
2014-07-21E1407006010.700 ppb
2014-07-21E1407005960.700 ppb
2014-10-20E141000178ND
2014-10-20E141000176ND
2014-10-20E141000173ND
2014-10-20E1410001770.500 ppb
2015-01-22VA010-DCLSND
2015-01-22VA010-DCLSND
2015-01-22VA010-DCLSND
2015-01-22VA010-DCLSND
2015-04-20VA010-DCLSND
2015-04-20VA010-DCLSND
2015-04-20VA010-DCLSND
2015-04-20VA010-DCLSND
2015-07-22VA010-DCLS0.600 ppb
2015-07-22VA010-DCLS0.800 ppb
2015-07-22VA010-DCLS0.800 ppb
2015-07-22VA010-DCLS0.700 ppb
2015-10-19VA010-DCLSND
2015-10-19VA010-DCLSND
2015-10-19VA010-DCLSND
2015-10-19VA010-DCLSND
2016-01-20E151202654ND
2016-01-20E151202652ND
2016-01-20E151202649ND
2016-01-20E151202656ND
2016-04-21E1603020170.500 ppb
2016-04-21E1603020200.600 ppb
2016-04-21E160302021ND
2016-04-21E160302019ND
2016-07-18E1607005980.500 ppb
2016-07-18E160700592ND
2016-07-18E1607005940.600 ppb
2016-07-18E1607005970.600 ppb
2016-10-17E1609069940.500 ppb
2016-10-17E160906997ND
2016-10-17E160906995ND
2016-10-17E160907000ND
2017-01-18E161206558ND
2017-01-18E161206556ND
2017-01-18E161206555ND
2017-01-18E161206559ND
2017-04-17E170305224ND
2017-04-17E170305225ND
2017-04-17E170305231ND
2017-04-17E170305229ND
2017-07-19E170702568ND
2017-07-19E1707025530.700 ppb
2017-07-19E1707025640.500 ppb
2017-07-19E1707025620.500 ppb
2017-10-16E171000386ND
2017-10-16E171000383ND
2017-10-16E171000381ND
2017-10-17E171000384ND
2018-01-22E180101009ND
2018-01-22E180101007ND
2018-01-22E180101005ND
2018-01-22E180101003ND
2018-04-23E180306284ND
2018-04-23E180306278ND
2018-04-23E180306280ND
2018-04-23E180306282ND
2018-07-16E1806088540.600 ppb
2018-07-16E1806088530.600 ppb
2018-07-16E1806088520.500 ppb
2018-07-16E1806088490.600 ppb
2018-10-22E181002430ND
2018-10-22E181002432ND
2018-10-22E181002434ND
2018-10-22E181002437ND
2019-01-23E181206351ND
2019-01-23E1812063530.500 ppb
2019-01-23E181206354ND
2019-01-23E181206355ND
2019-04-23E190303072ND
2019-04-23E1903030770.600 ppb
2019-04-23E1903030750.500 ppb
2019-04-23E1903030730.700 ppb
2019-07-24E1907002010.700 ppb
2019-07-24E1907002040.700 ppb
2019-07-24E1907002020.700 ppb
2019-07-24E190700198ND
2019-10-21E1910036790.800 ppb
2019-10-21E191003678ND
2019-10-21E1910036770.600 ppb
2019-10-21E1910036760.500 ppb