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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

Calico Rock

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane 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

 

85

Samples

0

Samples exceeding legal limit (MCL)

17

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.26 ppb156ND - 6.50 ppb
20150.520 ppb133ND - 4.76 ppb
20160.145 ppb152ND - 1.42 ppb
20170.125 ppb151ND - 1.87 ppb
20180.220 ppb142ND - 1.77 ppb
20190.502 ppb133ND - 3.26 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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
2014-03-18140790044021.40 ppb
2014-03-18140790046024.40 ppb
2014-03-18140790045021.30 ppb
2014-05-2714149007402ND
2014-05-2714149007301ND
2014-05-27141490076024.30 ppb
2014-05-2714149007502ND
2014-08-2514239003002ND
2014-08-2514239002901ND
2014-08-2514239003102ND
2014-08-2514239002701ND
2014-08-25142390026011.01 ppb
2014-08-25142390032026.50 ppb
2014-10-1414288001602ND
2014-10-1414288001202ND
2015-01-1315015002002ND
2015-01-1315015002302ND
2015-04-1415106002902ND
2015-04-1415106002801ND
2015-04-1415106002702ND
2015-07-1415196000802ND
2015-07-1415196000902ND
2015-07-14151960012011.000 ppb
2015-07-14151960010014.76 ppb
2015-07-1415196001101ND
2015-10-14152890059021.000 ppb
2015-10-1415289005702ND
2015-10-1415289005801ND
2016-01-1316015011301ND
2016-02-1616049002802ND
2016-02-1616049002902ND
2016-04-1216105010002ND
2016-04-1216105010101ND
2016-05-2416147008602ND
2016-05-2416147008502ND
2016-07-1216196017901ND
2016-07-1216196017702ND
2016-07-12161960176010.760 ppb
2016-07-12161960175011.42 ppb
2016-07-1216196017402ND
2016-10-1116287009702ND
2016-10-1116287009801ND
2016-10-1116287009602ND
2017-01-1017012009902ND
2017-01-1017012009702ND
2017-01-1017012010001ND
2017-04-1117103002602ND
2017-04-1117103002302ND
2017-04-1117103002401ND
2017-04-1117103002501ND
2017-07-11171940097011.87 ppb
2017-07-1117194009602ND
2017-07-1117194009902ND
2017-07-1117194009801ND
2017-07-1117194010001ND
2017-10-1017285011701ND
2017-10-1017285011502ND
2017-10-1017285011602ND
2018-01-0918010003001ND
2018-01-0918010002901ND
2018-04-1118102005702ND
2018-04-1118102005902ND
2018-04-1118102006101ND
2018-04-1118102006001ND
2018-07-10181930115011.31 ppb
2018-07-10181930112011.77 ppb
2018-07-1018193011102ND
2018-07-1018193011302ND
2018-07-1018193011601ND
2018-10-0118284007902ND
2018-10-0918284008101ND
2018-10-0918284008002ND
2019-01-1519016002302ND
2019-01-1519016002501ND
2019-01-1519016002402ND
2019-04-0919100002602ND
2019-04-0919100002302ND
2019-07-3119214000301ND
2019-07-3119214000401ND
2019-08-26192400004012.74 ppb
2019-08-2619240000601ND
2019-08-26192400003013.26 ppb
2019-10-08192820022010.520 ppb
2019-10-0819282001902ND
2019-10-0819282002102ND