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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

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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

 

48

Samples

0

Samples exceeding legal limit (MCL)

22

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.85 ppb221.04 ppb - 2.66 ppb
20150.417 ppb207ND - 3.55 ppb
20162.45 ppb220.950 ppb - 3.95 ppb
20171.93 ppb21ND - 3.86 ppb
20180.463 ppb209ND - 3.84 ppb
20191.31 ppb21ND - 2.61 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
2014-09-10AC341872.66 ppb
2014-09-10AC341861.04 ppb
2015-01-22AC413990.510 ppb
2015-01-22AC41400ND
2015-01-22AC414041.06 ppb
2015-01-22AC41397ND
2015-01-22AC414050.520 ppb
2015-01-22AC41409ND
2015-01-22AC41403ND
2015-01-22AC414130.620 ppb
2015-01-22AC41402ND
2015-01-22AC41412ND
2015-01-22AC41411ND
2015-01-22AC41414ND
2015-01-22AC41406ND
2015-01-22AC41410ND
2015-01-22AC414070.680 ppb
2015-01-22AC41408ND
2015-01-22AC41398ND
2015-01-22AC41401ND
2015-08-17AC573741.40 ppb
2015-08-17AC573753.55 ppb
2016-07-19AC797550.950 ppb
2016-07-19AC797563.95 ppb
2017-08-18AD03368ND
2017-08-18AD033693.86 ppb
2018-01-24AD12001ND
2018-01-24AD120160.530 ppb
2018-01-24AD12015ND
2018-01-24AD12014ND
2018-01-24AD12012ND
2018-01-24AD12011ND
2018-01-24AD12010ND
2018-01-24AD12009ND
2018-01-24AD120080.610 ppb
2018-01-24AD12007ND
2018-01-24AD120060.620 ppb
2018-01-24AD120050.520 ppb
2018-01-24AD120030.630 ppb
2018-01-24AD120020.750 ppb
2018-01-24AD12004ND
2018-01-24AD12000ND
2018-01-24AD119990.700 ppb
2018-01-24AD11998ND
2018-08-16AD311711.06 ppb
2018-08-16AD311723.84 ppb
2019-08-27AD53898ND
2019-08-27AD538992.61 ppb