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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

St John Water District 3

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

 

176

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
20150.469 ppb322ND - 7.50 ppb
2016ND320ND
2017ND320ND
2018ND320ND
20190.250 ppb324ND - 2.60 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
2014-08-27208600001ND
2014-08-27208600002ND
2014-08-27208600003ND
2014-08-27208600004ND
2014-08-27208600001ND
2014-08-27208600002ND
2014-08-27208600003ND
2014-08-27208600004ND
2014-12-102013524001ND
2014-12-102013524002ND
2014-12-102013524003ND
2014-12-102013524004ND
2014-12-102013524001ND
2014-12-102013524002ND
2014-12-102013524003ND
2014-12-102013524004ND
2015-03-052016735001ND
2015-03-052016735002ND
2015-03-052016735003ND
2015-03-052016735004ND
2015-03-052016735001ND
2015-03-052016735002ND
2015-03-052016735003ND
2015-03-052016735004ND
2015-06-032020894001ND
2015-06-032020894002ND
2015-06-032020894003ND
2015-06-032020894004ND
2015-06-032020894001ND
2015-06-032020894002ND
2015-06-032020894003ND
2015-06-032020894004ND
2015-09-022025095001ND
2015-09-022025095002ND
2015-09-0220250950037.50 ppb
2015-09-022025095004ND
2015-09-022025095001ND
2015-09-022025095002ND
2015-09-0220250950037.50 ppb
2015-09-022025095004ND
2015-12-092029831001ND
2015-12-092029831002ND
2015-12-092029831003ND
2015-12-092029831004ND
2015-12-092029831001ND
2015-12-092029831002ND
2015-12-092029831003ND
2015-12-092029831004ND
2016-03-072033508001ND
2016-03-072033508002ND
2016-03-072033508003ND
2016-03-072033508004ND
2016-03-072033508001ND
2016-03-072033508002ND
2016-03-072033508003ND
2016-03-072033508004ND
2016-06-082037927001ND
2016-06-082037927003ND
2016-06-082037927004ND
2016-06-08203797002ND
2016-06-082037927001ND
2016-06-082037927003ND
2016-06-082037927004ND
2016-06-08203797002ND
2016-09-142042677001ND
2016-09-142042677002ND
2016-09-142042677003ND
2016-09-142042677004ND
2016-09-142042677001ND
2016-09-142042677002ND
2016-09-142042677003ND
2016-09-142042677004ND
2016-12-072047039001ND
2016-12-072047060001ND
2016-12-072047069001ND
2016-12-072047070001ND
2016-12-072047039001ND
2016-12-072047060001ND
2016-12-072047069001ND
2016-12-072047070001ND
2017-03-1535301201001ND
2017-03-1535301201002ND
2017-03-1535301201003ND
2017-03-1535301201004ND
2017-03-1535301201001ND
2017-03-1535301201002ND
2017-03-1535301201003ND
2017-03-1535301201004ND
2017-06-2235320231013ND
2017-06-2235320231014ND
2017-06-2235320231015ND
2017-06-2235320231016ND
2017-06-2235320231013ND
2017-06-2235320231014ND
2017-06-2235320231015ND
2017-06-2235320231016ND
2017-09-2135337395005ND
2017-09-2135337395006ND
2017-09-2135337395007ND
2017-09-2135337395008ND
2017-09-2135337395005ND
2017-09-2135337395006ND
2017-09-2135337395007ND
2017-09-2135337395008ND
2017-12-1435363551001ND
2017-12-1435363551002ND
2017-12-1435363551003ND
2017-12-1435363551004ND
2017-12-1435363551001ND
2017-12-1435363551002ND
2017-12-1435363551003ND
2017-12-1435363551004ND
2018-03-1535380541001ND
2018-03-1535380541002ND
2018-03-1535380541003ND
2018-03-1535380541004ND
2018-03-1535380541001ND
2018-03-1535380541002ND
2018-03-1535380541003ND
2018-03-1535380541004ND
2018-06-1435398653001ND
2018-06-1435398653002ND
2018-06-1435398653003ND
2018-06-1435398653004ND
2018-06-1435398653001ND
2018-06-1435398653002ND
2018-06-1435398653003ND
2018-06-1435398653004ND
2018-09-0635416144001ND
2018-09-0635416144002ND
2018-09-0635416144003ND
2018-09-0635416144001ND
2018-09-0635416144002ND
2018-09-0635416144003ND
2018-09-2035419461001ND
2018-09-2035419461001ND
2018-12-1035436358001ND
2018-12-1035436358002ND
2018-12-1035436358003ND
2018-12-1035436358004ND
2018-12-1035436358001ND
2018-12-1035436358002ND
2018-12-1035436358003ND
2018-12-1035436358004ND
2019-03-1335454558001ND
2019-03-1335454558002ND
2019-03-1335454558003ND
2019-03-1335454558004ND
2019-03-1335454558001ND
2019-03-1335454558002ND
2019-03-1335454558003ND
2019-03-1335454558004ND
2019-06-11354752820011.40 ppb
2019-06-1135475282002ND
2019-06-1135475282003ND
2019-06-1135475282004ND
2019-06-11354752820011.40 ppb
2019-06-1135475282002ND
2019-06-1135475282003ND
2019-06-1135475282004ND
2019-09-1235497592001ND
2019-09-1235497592002ND
2019-09-1235497592003ND
2019-09-1235497592004ND
2019-09-1235497592001ND
2019-09-1235497592002ND
2019-09-1235497592003ND
2019-09-1235497592004ND
2019-12-09355175890012.60 ppb
2019-12-0935517589002ND
2019-12-0935517589003ND
2019-12-0935517589004ND
2019-12-09355175890012.60 ppb
2019-12-0935517589002ND
2019-12-0935517589003ND
2019-12-0935517589004ND