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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

Stanford University

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

 

183

Samples

0

Samples exceeding legal limit (MCL)

100

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.40 ppb16160.530 ppb - 2.22 ppb
20151.16 ppb169ND - 2.43 ppb
20163.75 ppb1610ND - 11.3 ppb
20171.48 ppb3922ND - 3.96 ppb
20181.28 ppb4821ND - 7.52 ppb
20191.09 ppb4822ND - 3.81 ppb

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
2014-03-051610-900-10450.530 ppb
2014-03-051610-901-07550.540 ppb
2014-03-051610-902-08150.540 ppb
2014-03-051610-903-09000.650 ppb
2014-06-041610-900-08250.660 ppb
2014-06-041610-901-06400.630 ppb
2014-06-041610-902-08350.720 ppb
2014-06-041610-903-07300.640 ppb
2014-09-101610-900-08052.18 ppb
2014-09-101610-901-06002.15 ppb
2014-09-101610-902-08202.18 ppb
2014-09-101610-903-06152.14 ppb
2014-12-031610-900-13102.22 ppb
2014-12-031610-901-10452.22 ppb
2014-12-031610-902-11002.18 ppb
2014-12-031610-903-11502.19 ppb
2015-03-111610-900-08552.09 ppb
2015-03-111610-901-09001.94 ppb
2015-03-111610-902-10051.93 ppb
2015-03-111610-903-10202.34 ppb
2015-06-031610-900-1300ND
2015-06-031610-901-0900ND
2015-06-031610-902-0915ND
2015-06-031610-903-1005ND
2015-09-021610-900-1036ND
2015-09-021610-901-0810ND
2015-09-021610-902-07451.01 ppb
2015-09-021610-903-0908ND
2015-12-161610-900-11452.29 ppb
2015-12-161610-901-09352.27 ppb
2015-12-161610-902-09152.26 ppb
2015-12-161610-903-10252.43 ppb
2016-02-101610-900-105011.3 ppb
2016-02-101610-901-083510.9 ppb
2016-02-101610-902-091011.0 ppb
2016-02-101610-903-084011.3 ppb
2016-06-011610-900-10502.09 ppb
2016-06-011610-901-09052.11 ppb
2016-06-011610-902-11502.12 ppb
2016-06-011610-903-11202.23 ppb
2016-09-071610-900-1130ND
2016-09-071610-901-0935ND
2016-09-071610-902-1000ND
2016-10-051610-903-1015ND
2016-12-141610-900-1200ND
2016-12-141610-901-09503.50 ppb
2016-12-141610-902-10203.60 ppb
2016-12-141610-903-0000ND
2017-03-011610-900-10503.93 ppb
2017-03-011610-901-08553.90 ppb
2017-03-011610-902-09153.76 ppb
2017-03-011610-903-11453.96 ppb
2017-04-051610-900-11453.44 ppb
2017-04-051610-901-08503.42 ppb
2017-04-051610-902-09153.28 ppb
2017-04-051610-903-09403.50 ppb
2017-05-031610-900-11303.33 ppb
2017-05-031610-901-09153.14 ppb
2017-05-031610-902-09353.05 ppb
2017-05-031610-903-09553.17 ppb
2017-06-071610-900-00002.28 ppb
2017-06-071610-901-00002.26 ppb
2017-06-071610-902-00002.28 ppb
2017-06-071610-903-09052.46 ppb
2017-07-051610-900-1225ND
2017-07-051610-901-0930ND
2017-07-051610-902-1015ND
2017-07-051610-903-1010ND
2017-08-021610-900-1155ND
2017-08-021610-901-0930ND
2017-08-021610-902-1000ND
2017-08-021610-903-1030ND
2017-09-065867-901-09501.10 ppb
2017-09-065867-902-09151.000 ppb
2017-09-065867-903-09501.10 ppb
2017-10-041610-900-1110ND
2017-10-041610-901-0835ND
2017-10-041610-902-0855ND
2017-10-041610-903-1130ND
2017-11-011610-900-10451.13 ppb
2017-11-011610-901-0830ND
2017-11-011610-902-0840ND
2017-11-011610-903-0940ND
2017-12-061610-900-11251.01 ppb
2017-12-061610-901-0945ND
2017-12-061610-902-1200ND
2017-12-061610-903-09551.03 ppb
2018-01-171610-900-11351.75 ppb
2018-01-171610-901-09351.65 ppb
2018-01-171610-902-09551.64 ppb
2018-01-171610-903-10301.68 ppb
2018-02-071610-900-00002.05 ppb
2018-02-071610-901-00001.98 ppb
2018-02-071610-902-00001.84 ppb
2018-02-071610-903-00001.48 ppb
2018-03-071610-900-1355ND
2018-03-071610-901-1220ND
2018-03-071610-902-1230ND
2018-03-071610-903-1400ND
2018-04-041610-900-10407.52 ppb
2018-04-041610-901-08205.97 ppb
2018-04-041610-902-08405.63 ppb
2018-04-041610-903-10002.56 ppb
2018-05-021610-900-10501.16 ppb
2018-05-021610-901-08301.32 ppb
2018-05-021610-902-09201.40 ppb
2018-05-021610-903-09451.46 ppb
2018-06-061610-900-11151.17 ppb
2018-06-061610-901-0840ND
2018-06-061610-902-0900ND
2018-06-061610-903-0850ND
2018-07-021610-900-1105ND
2018-07-021610-901-0850ND
2018-07-021610-902-0915ND
2018-07-021610-903-1135ND
2018-08-011610-900-1145ND
2018-08-011610-901-0955ND
2018-08-011610-902-0940ND
2018-08-011610-903-0900ND
2018-09-051610-900-1145ND
2018-09-051610-901-0915ND
2018-09-051610-902-0930ND
2018-09-051610-903-0950ND
2018-10-031610-900-1005ND
2018-10-031610-901-0655ND
2018-10-031610-902-0730ND
2018-10-031610-903-0950ND
2018-11-071610-900-12404.68 ppb
2018-11-071610-901-09055.46 ppb
2018-11-071610-902-09404.65 ppb
2018-11-071610-903-10054.18 ppb
2018-12-051610-900-1455ND
2018-12-051610-901-1425ND
2018-12-051610-902-1350ND
2018-12-051610-903-1100ND
2019-01-021610-900-1020ND
2019-01-021610-901-0820ND
2019-01-021610-902-0840ND
2019-01-021610-903-0820ND
2019-02-061610-900-11203.52 ppb
2019-02-061610-901-09103.65 ppb
2019-02-061610-902-09303.60 ppb
2019-02-061610-903-09203.57 ppb
2019-03-061610-900-09303.81 ppb
2019-03-061610-901-07003.61 ppb
2019-03-061610-902-07203.56 ppb
2019-03-061610-903-08303.67 ppb
2019-04-031610-900-11152.70 ppb
2019-04-031610-901-09052.75 ppb
2019-04-031610-902-09202.68 ppb
2019-04-031610-903-13402.69 ppb
2019-05-011610-900-1045ND
2019-05-011610-901-0725ND
2019-05-011610-902-0755ND
2019-05-011610-903-0742ND
2019-06-051610-900-09551.05 ppb
2019-06-051610-901-07501.08 ppb
2019-06-051610-902-07201.02 ppb
2019-06-051610-903-09251.01 ppb
2019-07-021610-900-1125ND
2019-07-021610-901-0920ND
2019-07-021610-902-0930ND
2019-07-021610-903-0840ND
2019-08-071610-900-1150ND
2019-08-071610-901-0900ND
2019-08-071610-902-0830ND
2019-08-071610-903-1010ND
2019-09-041610-900-0935ND
2019-09-041610-901-0710ND
2019-09-041610-902-0735ND
2019-09-041610-903-1035ND
2019-10-021610-900-1000ND
2019-10-021610-901-0725ND
2019-10-021610-902-0750ND
2019-10-021610-903-0945ND
2019-11-061610-900-12301.07 ppb
2019-11-061610-901-0700ND
2019-11-061610-902-07201.08 ppb
2019-11-061610-903-10301.07 ppb
2019-12-041610-900-10251.84 ppb
2019-12-041610-901-08301.67 ppb
2019-12-041610-902-09001.79 ppb
2019-12-041610-903-1200ND