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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Howard Waterworks

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

 

101

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.337 ppb1918ND - 0.490 ppb
20150.213 ppb1611ND - 0.380 ppb
20160.178 ppb169ND - 0.370 ppb
20170.141 ppb167ND - 0.370 ppb
20180.163 ppb169ND - 0.480 ppb
20190.142 ppb1811ND - 0.320 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
2014-01-075026391A0.460 ppb
2014-03-137747180.430 ppb
2014-03-137747200.460 ppb
2014-03-137747190.470 ppb
2014-03-137747210.490 ppb
2014-03-31777675ND
2014-04-017779200.320 ppb
2014-06-117965020.250 ppb
2014-06-117965030.260 ppb
2014-06-117965010.260 ppb
2014-06-117965000.340 ppb
2014-09-088171310.180 ppb
2014-09-088171320.400 ppb
2014-09-088171340.450 ppb
2014-09-098171330.420 ppb
2014-12-028343370.280 ppb
2014-12-028343400.300 ppb
2014-12-028343380.310 ppb
2014-12-028343390.330 ppb
2015-03-108477110.220 ppb
2015-03-108477120.260 ppb
2015-03-108477130.280 ppb
2015-03-108477140.290 ppb
2015-06-10865031ND
2015-06-108650330.280 ppb
2015-06-108650320.290 ppb
2015-06-108650340.320 ppb
2015-09-108830120.340 ppb
2015-09-108830130.370 ppb
2015-09-108830140.370 ppb
2015-09-108830150.380 ppb
2015-12-08897786ND
2015-12-08897783ND
2015-12-08897784ND
2015-12-08897785ND
2016-03-07909032ND
2016-03-079090340.240 ppb
2016-03-079090350.280 ppb
2016-03-079090330.310 ppb
2016-06-07925313ND
2016-06-07925314ND
2016-06-07925315ND
2016-06-07925316ND
2016-09-07944231ND
2016-09-07944230ND
2016-09-079442280.310 ppb
2016-09-079442290.360 ppb
2016-12-069650450.290 ppb
2016-12-069650460.340 ppb
2016-12-069650440.350 ppb
2016-12-069650470.370 ppb
2017-03-07976762ND
2017-03-07976760ND
2017-03-079767630.230 ppb
2017-03-079767610.370 ppb
2017-06-06996227ND
2017-06-06996226ND
2017-06-06996225ND
2017-06-06996228ND
2017-09-0610166970.280 ppb
2017-09-0610166980.330 ppb
2017-09-0610166990.360 ppb
2017-09-0610167000.370 ppb
2017-12-051032661ND
2017-12-051032660ND
2017-12-051032663ND
2017-12-0510326620.310 ppb
2018-03-071044335ND
2018-03-071044334ND
2018-03-071044337ND
2018-03-0710443360.480 ppb
2018-06-131061602ND
2018-06-131061604ND
2018-06-131061605ND
2018-06-131061603ND
2018-09-0510786430.250 ppb
2018-09-0510786450.270 ppb
2018-09-0510786440.310 ppb
2018-09-0510786460.350 ppb
2018-12-0310955600.220 ppb
2018-12-0310955610.230 ppb
2018-12-0310955580.240 ppb
2018-12-0310955590.260 ppb
2019-03-1111094140.140 ppb
2019-03-1111094150.160 ppb
2019-03-1111094130.160 ppb
2019-03-1111094120.160 ppb
2019-06-051126037ND
2019-06-051126039ND
2019-06-051126038ND
2019-06-051126040ND
2019-09-0911469420.260 ppb
2019-09-0911469400.270 ppb
2019-09-0911469410.290 ppb
2019-09-0911469430.300 ppb
2019-10-161155926ND
2019-10-161155929ND
2019-12-031163506ND
2019-12-0311635050.220 ppb
2019-12-0311635080.280 ppb
2019-12-0311635070.320 ppb