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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Central Water System

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)

82

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.15 ppb16161.40 ppb - 3.40 ppb
20151.65 ppb1612ND - 2.80 ppb
20161.81 ppb16161.60 ppb - 2.10 ppb
20171.76 ppb1614ND - 3.00 ppb
20181.45 ppb1612ND - 2.70 ppb
20191.23 ppb1612ND - 2.30 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
2014-02-24248357011.40 ppb
2014-02-24248356011.80 ppb
2014-02-24248357011.40 ppb
2014-02-24248356011.80 ppb
2014-05-12257069012.10 ppb
2014-05-12257070011.70 ppb
2014-05-12257070011.70 ppb
2014-05-12257069012.10 ppb
2014-08-25267584012.30 ppb
2014-08-25267585011.60 ppb
2014-08-25267585011.60 ppb
2014-08-25267584012.30 ppb
2014-11-17275506012.90 ppb
2014-11-17275507013.40 ppb
2014-11-17275507013.40 ppb
2014-11-17275506012.90 ppb
2015-02-1728176101ND
2015-02-1728176201ND
2015-02-1728176201ND
2015-02-1728176101ND
2015-05-21289162012.40 ppb
2015-05-21289163012.10 ppb
2015-05-21289163012.10 ppb
2015-05-21289162012.40 ppb
2015-08-11298371012.50 ppb
2015-08-11298370012.80 ppb
2015-08-11298371012.50 ppb
2015-08-11298370012.80 ppb
2015-11-16305597011.70 ppb
2015-11-16305598011.70 ppb
2015-11-16305598011.70 ppb
2015-11-16305597011.70 ppb
2016-02-24311548011.80 ppb
2016-02-24311549011.70 ppb
2016-02-24311549011.70 ppb
2016-02-24311548011.80 ppb
2016-05-23318445011.80 ppb
2016-05-23318444011.60 ppb
2016-05-23318445011.80 ppb
2016-05-23318444011.60 ppb
2016-08-22328682011.90 ppb
2016-08-22328683012.10 ppb
2016-08-22328683012.10 ppb
2016-08-22328682011.90 ppb
2016-11-15337169011.90 ppb
2016-11-15337170011.70 ppb
2016-11-15337170011.70 ppb
2016-11-15337169011.90 ppb
2017-02-17352960860122.10 ppb
2017-02-17352960860113.00 ppb
2017-02-17352960860113.00 ppb
2017-02-17352960860122.10 ppb
2017-05-04353113080141.50 ppb
2017-05-04353113080141.50 ppb
2017-05-04353113080152.30 ppb
2017-05-04353113080152.30 ppb
2017-08-0435328362035ND
2017-08-04353283620362.10 ppb
2017-08-0435328362035ND
2017-08-04353283620362.10 ppb
2017-11-20353496880021.90 ppb
2017-11-20353496880011.20 ppb
2017-11-20353496880011.20 ppb
2017-11-20353496880021.90 ppb
2018-02-08353739780021.30 ppb
2018-02-08353739780011.10 ppb
2018-02-08353739780021.30 ppb
2018-02-08353739780011.10 ppb
2018-05-03353903170021.80 ppb
2018-05-03353903170021.80 ppb
2018-05-03353903170012.70 ppb
2018-05-03353903170012.70 ppb
2018-08-02354086830022.30 ppb
2018-08-02354086830012.40 ppb
2018-08-02354086830012.40 ppb
2018-08-02354086830022.30 ppb
2018-11-0135428189001ND
2018-11-0135428189002ND
2018-11-0135428189001ND
2018-11-0135428189002ND
2019-02-14354490850021.30 ppb
2019-02-14354490850011.20 ppb
2019-02-14354490850011.20 ppb
2019-02-14354490850021.30 ppb
2019-05-1435469028002ND
2019-05-1435469028002ND
2019-05-1435469028001ND
2019-05-1435469028001ND
2019-08-21354924490021.90 ppb
2019-08-21354924490012.30 ppb
2019-08-21354924490012.30 ppb
2019-08-21354924490021.90 ppb
2019-11-21355146100011.60 ppb
2019-11-21355146100021.50 ppb
2019-11-21355146100011.60 ppb
2019-11-21355146100021.50 ppb