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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

City of Alamo

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

 

102

Samples

0

Samples exceeding legal limit (MCL)

58

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.24 ppb175ND - 5.20 ppb
20150.547 ppb174ND - 2.90 ppb
20161.28 ppb178ND - 3.60 ppb
20170.494 ppb177ND - 1.30 ppb
20181.78 ppb17171.10 ppb - 2.60 ppb
20192.35 ppb17171.10 ppb - 3.70 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
2014-02-28AC452604.90 ppb
2014-02-28AC452645.00 ppb
2014-02-28AC452964.90 ppb
2014-02-28AC453225.20 ppb
2014-04-22AC51361ND
2014-04-22AC51360ND
2014-04-22AC51356ND
2014-04-22AC513591.000 ppb
2014-07-23AC60710ND
2014-07-23AC60758ND
2014-07-23AC60754ND
2014-07-23AC60757ND
2014-07-23AC60755ND
2014-10-21AC70171ND
2014-10-21AC70156ND
2014-10-21AC70170ND
2014-10-21AC70157ND
2015-01-21AC77196ND
2015-01-21AC77200ND
2015-01-21AC77198ND
2015-01-21AC77199ND
2015-04-07AC87462ND
2015-04-07AC87457ND
2015-04-07AC87451ND
2015-04-07AC87482ND
2015-07-14AC99403ND
2015-07-14AC99330ND
2015-07-14AC99333ND
2015-07-14AC99334ND
2015-07-14AC99327ND
2015-10-20AD111612.90 ppb
2015-10-20AD111582.00 ppb
2015-10-20AD111562.30 ppb
2015-10-20AD111662.10 ppb
2016-03-02AD26623ND
2016-03-02AD26625ND
2016-03-02AD26618ND
2016-03-02AD26619ND
2016-06-08AD397482.10 ppb
2016-06-08AD397492.00 ppb
2016-06-08AD397142.00 ppb
2016-06-08AD397081.90 ppb
2016-07-14AD44287ND
2016-07-14AD44231ND
2016-07-14AD44218ND
2016-07-14AD44217ND
2016-07-14AD44222ND
2016-11-15AD579823.60 ppb
2016-11-15AD580063.30 ppb
2016-11-15AD580083.30 ppb
2016-11-15AD580033.50 ppb
2017-01-10AD639261.30 ppb
2017-01-10AD639251.20 ppb
2017-01-10AD639241.30 ppb
2017-01-10AD639381.000 ppb
2017-05-01AD81755ND
2017-05-01AD81776ND
2017-05-01AD81756ND
2017-05-01AD81779ND
2017-07-12AD89091ND
2017-07-12AD89050ND
2017-07-12AD89052ND
2017-07-12AD89056ND
2017-07-12AD89053ND
2017-10-31AE028991.30 ppb
2017-10-31AE02919ND
2017-10-31AE029151.20 ppb
2017-10-31AE029181.10 ppb
2018-01-24AE101492.40 ppb
2018-01-24AE101481.90 ppb
2018-01-24AE101432.30 ppb
2018-01-24AE101511.80 ppb
2018-04-11AE220461.40 ppb
2018-04-11AE220451.10 ppb
2018-04-11AE220371.20 ppb
2018-04-11AE220391.10 ppb
2018-08-16AE373832.30 ppb
2018-08-16AE373262.40 ppb
2018-08-16AE373282.60 ppb
2018-08-16AE373252.30 ppb
2018-08-16AE373342.40 ppb
2018-10-10AE430611.30 ppb
2018-10-10AE430781.30 ppb
2018-10-10AE430771.40 ppb
2018-10-10AE430541.10 ppb
2019-02-26AE559451.30 ppb
2019-02-26AE559411.40 ppb
2019-02-26AE559432.40 ppb
2019-02-26AE559491.10 ppb
2019-05-21AE673402.30 ppb
2019-05-21AE673362.00 ppb
2019-05-21AE673392.40 ppb
2019-05-21AE673471.90 ppb
2019-09-04AE820771.70 ppb
2019-09-04AE820183.30 ppb
2019-09-04AE820112.70 ppb
2019-09-04AE820203.70 ppb
2019-09-04AE820132.90 ppb
2019-11-07AE888682.90 ppb
2019-11-07AE888702.60 ppb
2019-11-07AE888752.90 ppb
2019-11-07AE888732.50 ppb