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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

City of Houston Willow Chase

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

 

116

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.138 ppb162ND - 1.20 ppb
20150.310 ppb202ND - 5.00 ppb
20160.240 ppb201ND - 4.80 ppb
20170.0700 ppb201ND - 1.40 ppb
2018ND200ND
2019ND200ND

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
2014-03-06AC45966ND
2014-03-06AC45967ND
2014-03-06AC45974ND
2014-03-06AC45957ND
2014-05-20AC54709ND
2014-05-20AC54711ND
2014-05-20AC54710ND
2014-05-20AC54712ND
2014-08-14AC637911.20 ppb
2014-08-14AC63793ND
2014-08-14AC63794ND
2014-08-14AC63789ND
2014-12-18AC75449ND
2014-12-18AC75450ND
2014-12-18AC75434ND
2014-12-18AC754451.000 ppb
2015-03-05AC82709ND
2015-03-05AC82689ND
2015-03-05AC82710ND
2015-03-05AC82711ND
2015-05-29AC93875ND
2015-05-29AC93891ND
2015-05-29AC93899ND
2015-05-29AC93893ND
2015-05-29AC93957ND
2015-05-29AC94008ND
2015-05-29AC94002ND
2015-05-29AC939985.00 ppb
2015-09-17AD07545ND
2015-09-17AD07559ND
2015-09-17AD07542ND
2015-09-17AD07544ND
2015-12-08AD15933ND
2015-12-08AD15959ND
2015-12-08AD15957ND
2015-12-08AD159561.20 ppb
2016-03-03AD26929ND
2016-03-03AD269254.80 ppb
2016-03-03AD26933ND
2016-03-03AD26935ND
2016-03-03AD26845ND
2016-03-03AD26844ND
2016-03-03AD26843ND
2016-03-03AD26849ND
2016-06-03AD39365ND
2016-06-03AD39368ND
2016-06-03AD39362ND
2016-06-03AD39413ND
2016-09-22AD50726ND
2016-09-22AD50714ND
2016-09-22AD50725ND
2016-09-22AD50717ND
2016-11-21AD58771ND
2016-11-21AD58772ND
2016-11-21AD58770ND
2016-11-21AD58773ND
2017-03-02AD73126ND
2017-03-02AD73122ND
2017-03-02AD73086ND
2017-03-02AD73089ND
2017-03-02AD73087ND
2017-03-02AD730851.40 ppb
2017-05-31AD86147ND
2017-05-31AD86149ND
2017-05-31AD86107ND
2017-05-31AD86108ND
2017-05-31AD86106ND
2017-05-31AD86109ND
2017-08-15AD93059ND
2017-08-15AD93060ND
2017-08-15AD93058ND
2017-08-15AD93061ND
2017-12-04AE06558ND
2017-12-04AE06557ND
2017-12-04AE06556ND
2017-12-04AE06555ND
2018-01-31AE11531ND
2018-01-31AE11530ND
2018-01-31AE11527ND
2018-01-31AE11529ND
2018-04-11AE22057ND
2018-04-11AE22055ND
2018-04-11AE22085ND
2018-04-11AE22081ND
2018-04-11AE22016ND
2018-04-11AE22023ND
2018-04-11AE22022ND
2018-04-11AE22004ND
2018-08-15AE37138ND
2018-08-15AE37139ND
2018-08-15AE37137ND
2018-08-15AE37136ND
2018-11-07AE45580ND
2018-11-07AE45582ND
2018-11-07AE45581ND
2018-11-07AE45579ND
2019-02-28AE56578ND
2019-02-28AE56580ND
2019-02-28AE56582ND
2019-02-28AE56614ND
2019-02-28AE56533ND
2019-02-28AE56534ND
2019-02-28AE56535ND
2019-02-28AE56536ND
2019-05-20AE67107ND
2019-05-20AE67109ND
2019-05-20AE67114ND
2019-05-20AE67108ND
2019-09-23AE84226ND
2019-09-23AE84228ND
2019-09-23AE84230ND
2019-09-23AE84231ND
2019-11-22AE90353ND
2019-11-22AE90359ND
2019-11-22AE90352ND
2019-11-22AE90350ND