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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Harris County Water System

Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform 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)

10

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.0647 ppb171ND - 1.10 ppb
20150.459 ppb175ND - 2.00 ppb
20160.129 ppb172ND - 1.20 ppb
20170.0588 ppb171ND - 1.000 ppb
2018ND170ND
20190.0647 ppb171ND - 1.10 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for bromoform 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
2014-01-13AI26354ND
2014-01-13AI26355ND
2014-01-13AI26356ND
2014-01-13AI26357ND
2014-03-26AI36789ND
2014-04-14AI37969ND
2014-04-14AI37970ND
2014-04-14AI37971ND
2014-04-14AI37972ND
2014-07-14AI45637ND
2014-07-14AI45638ND
2014-07-14AI45639ND
2014-07-14AI45640ND
2014-10-15AI576601.10 ppb
2014-10-15AI57661ND
2014-10-15AI57662ND
2014-10-15AI57663ND
2015-01-13AI62793ND
2015-01-13AI62794ND
2015-01-13AI62795ND
2015-01-13AI62796ND
2015-03-03AI65822ND
2015-04-13AI74632ND
2015-04-13AI74633ND
2015-04-13AI74634ND
2015-04-13AI74635ND
2015-07-13AI827011.90 ppb
2015-07-13AI82702ND
2015-07-13AI82703ND
2015-07-13AI82704ND
2015-10-13AI927382.00 ppb
2015-10-13AI927391.30 ppb
2015-10-13AI927401.60 ppb
2015-10-13AI927411.000 ppb
2016-01-11AJ03861ND
2016-01-11AJ03862ND
2016-01-11AJ03863ND
2016-01-11AJ03864ND
2016-03-14AJ08120ND
2016-04-11AJ09793ND
2016-04-11AJ09794ND
2016-04-11AJ09795ND
2016-04-11AJ09796ND
2016-07-11AJ17111ND
2016-07-11AJ17112ND
2016-07-11AJ17113ND
2016-07-11AJ17114ND
2016-10-11AJ311971.20 ppb
2016-10-11AJ311981.000 ppb
2016-10-11AJ31199ND
2016-10-11AJ31200ND
2017-01-09AJ37757ND
2017-01-09AJ37758ND
2017-01-09AJ37759ND
2017-01-09AJ377601.000 ppb
2017-04-10AJ52885ND
2017-04-10AJ52886ND
2017-04-10AJ52887ND
2017-04-10AJ52888ND
2017-05-23AJ55995ND
2017-07-10AJ59584ND
2017-07-10AJ59585ND
2017-07-10AJ59586ND
2017-07-10AJ59587ND
2017-10-11AJ71534ND
2017-10-11AJ71535ND
2017-10-11AJ71536ND
2017-10-11AJ71537ND
2018-01-09AJ76339ND
2018-01-09AJ76340ND
2018-01-09AJ76341ND
2018-01-09AJ76342ND
2018-03-27AJ86462ND
2018-04-10AJ87204ND
2018-04-10AJ87205ND
2018-04-10AJ87206ND
2018-04-10AJ87207ND
2018-07-23AJ95266ND
2018-07-24AJ95263ND
2018-07-24AJ95264ND
2018-07-24AJ95265ND
2018-10-09AK03718ND
2018-10-09AK03719ND
2018-10-09AK03720ND
2018-10-09AK03721ND
2019-01-07AK08951ND
2019-01-07AK08952ND
2019-01-07AK08953ND
2019-01-07AK08954ND
2019-04-09AK14899ND
2019-04-09AK14900ND
2019-04-09AK14901ND
2019-04-09AK14902ND
2019-05-13AK17333ND
2019-07-08AK21657ND
2019-07-08AK21658ND
2019-07-08AK21659ND
2019-07-08AK21660ND
2019-10-08AK34591ND
2019-10-08AK34592ND
2019-10-08AK34593ND
2019-10-08AK345941.10 ppb