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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

City of San Jose - NSJ/Alviso

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

 

95

Samples

0

Samples exceeding legal limit (MCL)

17

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.24 ppb155ND - 4.80 ppb
20151.37 ppb168ND - 4.21 ppb
2016ND160ND
2017ND160ND
20180.559 ppb164ND - 2.69 ppb
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
2014-01-149590-902-11204.80 ppb
2014-01-149590-900-11553.40 ppb
2014-01-149590-901-10554.60 ppb
2014-01-149590-903-09204.60 ppb
2014-04-081610-903-0850ND
2014-04-081610-902-1050ND
2014-04-081610-901-1003ND
2014-04-081610-900-1134ND
2014-07-081610-902-1025ND
2014-07-081610-901-0955ND
2014-07-081610-900-1120ND
2014-10-141610-902-1040ND
2014-10-141610-901-1015ND
2014-10-141610-903-0855ND
2014-10-141610-900-11151.24 ppb
2015-01-131610-903-08431.76 ppb
2015-01-131610-902-10301.76 ppb
2015-01-131610-901-09501.76 ppb
2015-01-131610-900-11052.54 ppb
2015-04-141610-903-0840ND
2015-04-141610-902-1025ND
2015-04-141610-900-1105ND
2015-04-141610-901-0940ND
2015-07-141610-901-0936ND
2015-07-141610-900-1100ND
2015-07-141610-902-1012ND
2015-07-281610-903-0941ND
2015-10-131610-901-09572.99 ppb
2015-10-131610-900-09292.76 ppb
2015-10-131610-903-11064.08 ppb
2015-10-131610-902-08394.21 ppb
2016-01-121610-901-0946ND
2016-01-121610-900-1110ND
2016-01-121610-903-0841ND
2016-01-121610-902-1014ND
2016-04-121610-901-0955ND
2016-04-121610-900-1132ND
2016-04-121610-903-0852ND
2016-04-121610-902-1050ND
2016-07-121610-901-1005ND
2016-07-121610-900-1145ND
2016-07-121610-903-0902ND
2016-07-121610-902-1100ND
2016-10-111610-900-1001ND
2016-10-111610-902-1023ND
2016-10-111610-903-1101ND
2016-10-111610-901-1210ND
2017-01-101610-901-1020ND
2017-01-101610-900-1150ND
2017-01-101610-902-1105ND
2017-01-101610-903-0855ND
2017-04-111610-901-0941ND
2017-04-111610-900-1115ND
2017-04-111610-903-0828ND
2017-04-111610-902-1035ND
2017-07-111610-903-0830ND
2017-07-111610-901-0915ND
2017-07-111610-900-1039ND
2017-07-111610-902-1000ND
2017-10-111610-903-0840ND
2017-10-111610-900-1045ND
2017-10-111610-901-0930ND
2017-10-111610-902-1010ND
2018-01-091610-901-0905ND
2018-01-091610-903-0828ND
2018-01-091610-902-0935ND
2018-01-091610-900-1001ND
2018-04-091610-900-09352.69 ppb
2018-04-091610-902-09191.98 ppb
2018-04-091610-901-08252.10 ppb
2018-04-091610-903-08562.18 ppb
2018-07-101610-900-1153ND
2018-07-101610-901-0933ND
2018-07-101610-903-0835ND
2018-07-101610-902-1101ND
2018-10-091610-903-1023ND
2018-10-091610-902-0953ND
2018-10-091610-901-0925ND
2018-10-091610-900-1045ND
2019-01-081610-900-1006ND
2019-01-081610-901-0910ND
2019-01-081610-902-0945ND
2019-01-081610-903-0834ND
2019-04-091610-901-1049ND
2019-04-091610-900-1135ND
2019-04-091610-903-1116ND
2019-04-091610-902-0920ND
2019-07-091610-903-0838ND
2019-07-091610-901-0930ND
2019-07-091610-900-1100ND
2019-07-091610-902-1020ND
2019-10-081610-903-0918ND
2019-10-081610-901-0954ND
2019-10-081610-902-0843ND
2019-10-081610-900-1125ND