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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Ward 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

 

46

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND60ND
2015ND40ND
2016ND20ND
2017ND120ND
2018ND120ND
20191.11 ppb101ND - 11.1 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
2014-06-3014184000802ND
2014-06-3014184000702ND
2014-09-1514261003902ND
2014-09-1514261004002ND
2014-10-0714282001902ND
2014-10-0714282002202ND
2015-01-0515008013902ND
2015-01-0515008013802ND
2015-07-0815190001802ND
2015-11-0215307000902ND
2016-07-2016203002602ND
2016-10-0416279001302ND
2017-04-0417095001902ND
2017-04-0417095002002ND
2017-04-0417095002202ND
2017-04-0417095002102ND
2017-07-0417187005602ND
2017-07-0417187005502ND
2017-07-0417187005402ND
2017-07-0417187005302ND
2017-10-0217278004502ND
2017-10-0217278004602ND
2017-10-0217278004302ND
2017-10-0217278004402ND
2018-01-0318004011202ND
2018-01-0318004011002ND
2018-01-0318004010902ND
2018-01-0318004011102ND
2018-04-0418095014002ND
2018-04-0418095013902ND
2018-04-0418095013702ND
2018-04-0418095013602ND
2018-07-0418186015202ND
2018-07-0418186015302ND
2018-10-0118277000402ND
2018-10-0118277000302ND
2019-01-0319004001102ND
2019-01-0319004001202ND
2019-07-081919201270211.1 ppb
2019-07-0819192012402ND
2019-07-0819192012602ND
2019-07-0819192012302ND
2019-10-0319277006602ND
2019-10-0319277006402ND
2019-10-0319277006502ND
2019-10-0319277006702ND