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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Montgomery County Regional Public Water Authority

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

 

54

Samples

0

Samples exceeding legal limit (MCL)

12

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.322 ppb92ND - 1.50 ppb
20150.689 ppb93ND - 3.40 ppb
20160.0622 ppb91ND - 0.560 ppb
20170.537 ppb93ND - 2.20 ppb
20180.267 ppb92ND - 1.20 ppb
20190.122 ppb91ND - 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
2014-01-0814010004802ND
2014-01-0814010004702ND
2014-04-0314094004602ND
2014-04-0314094004502ND
2014-07-0214184005601ND
2014-07-0214184005802ND
2014-07-0214184005702ND
2014-10-07142820168021.50 ppb
2014-10-07142820169021.40 ppb
2015-01-07150080122023.40 ppb
2015-01-0715008012102ND
2015-04-0615099001502ND
2015-04-0615099001602ND
2015-07-0715191002001ND
2015-07-0715191002202ND
2015-07-0715191002102ND
2015-10-06152810081021.40 ppb
2015-10-06152810080021.40 ppb
2016-01-0416008004602ND
2016-01-0416008004702ND
2016-04-0416098008802ND
2016-04-0416098008702ND
2016-07-05161890165090.560 ppb
2016-07-0516189016702ND
2016-07-0516189016602ND
2016-10-0316280010302ND
2016-10-0316280010402ND
2017-01-0317005016302ND
2017-01-0317005016402ND
2017-04-05170960130021.70 ppb
2017-04-05170960129022.20 ppb
2017-07-0517187011202ND
2017-07-0517187011102ND
2017-07-05171870120010.930 ppb
2017-10-0217277001602ND
2017-10-0217277001502ND
2018-01-02180040128021.20 ppb
2018-01-02180040129021.20 ppb
2018-04-0218095012902ND
2018-06-1218166001401ND
2018-07-0218186013101ND
2018-07-0218186013502ND
2018-07-0218186013402ND
2018-10-0318277002402ND
2018-10-0318277002302ND
2019-01-0219004000402ND
2019-02-2019052003502ND
2019-07-0919192005409ND
2019-07-0919192005602ND
2019-07-0919192006802ND
2019-09-1619261000302ND
2019-09-1619261000202ND
2019-10-0219276009002ND
2019-10-02192760089021.10 ppb