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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

North City Water District

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)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND160ND
20150.531 ppb164ND - 2.50 ppb
2016ND160ND
2017ND160ND
2018ND160ND
2019ND160ND

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
2014-02-1302882ND
2014-02-1302880ND
2014-02-1302881ND
2014-02-1302883ND
2014-05-1508663ND
2014-05-1508664ND
2014-05-1508662ND
2014-05-1508665ND
2014-08-1414905ND
2014-08-1414903ND
2014-08-1414906ND
2014-08-1414904ND
2014-11-1301119ND
2014-11-1301118ND
2014-11-1301120ND
2014-11-1301117ND
2015-02-1041401ND
2015-02-1041402ND
2015-02-1041403ND
2015-02-1041404ND
2015-05-1414603ND
2015-05-1414601ND
2015-05-1414602ND
2015-05-1414604ND
2015-08-1371801ND
2015-08-1371804ND
2015-08-1371802ND
2015-08-1371803ND
2015-11-10466012.05 ppb
2015-11-10466022.50 ppb
2015-11-10466041.98 ppb
2015-11-10466031.96 ppb
2016-02-12ND
2016-02-12ND
2016-02-12ND
2016-02-12ND
2016-05-11ND
2016-05-11ND
2016-05-11ND
2016-05-11ND
2016-08-09ND
2016-08-09ND
2016-08-09ND
2016-08-09ND
2016-11-08ND
2016-11-08ND
2016-11-08ND
2016-11-08ND
2017-02-14ND
2017-02-14ND
2017-02-14ND
2017-02-14ND
2017-05-10ND
2017-05-10ND
2017-05-10ND
2017-05-10ND
2017-08-15ND
2017-08-15ND
2017-08-15ND
2017-08-15ND
2017-11-14ND
2017-11-14ND
2017-11-14ND
2017-11-14ND
2018-02-13ND
2018-02-13ND
2018-02-13ND
2018-02-13ND
2018-05-16ND
2018-05-16ND
2018-05-16ND
2018-05-16ND
2018-08-02ND
2018-08-02ND
2018-08-02ND
2018-08-02ND
2018-11-14ND
2018-11-14ND
2018-11-14ND
2018-11-14ND
2019-02-21ND
2019-02-21ND
2019-02-21ND
2019-02-21ND
2019-05-15ND
2019-05-15ND
2019-05-15ND
2019-05-15ND
2019-08-13ND
2019-08-13ND
2019-08-13ND
2019-08-13ND
2019-11-13ND
2019-11-13ND
2019-11-13ND
2019-11-13ND