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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Csa No. 31 Stonegate Ws

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

 

26

Samples

0

Samples exceeding legal limit (MCL)

9

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.610 ppb41ND - 2.44 ppb
20150.653 ppb41ND - 2.61 ppb
2016ND40ND
20171.08 ppb51ND - 5.40 ppb
20185.58 ppb52ND - 26.7 ppb
201934.7 ppb448.42 ppb - 56.3 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
2014-03-101610-801-1055ND
2014-06-091610-801-1330ND
2014-09-081610-801-1200ND
2014-12-081610-801-11002.44 ppb
2015-03-091610-801-1405ND
2015-06-081610-801-1200ND
2015-09-211610-801-09202.61 ppb
2015-12-071610-801-1000ND
2016-03-071610-801-1700ND
2016-06-131610-801-1720ND
2016-09-121610-801-0820ND
2016-12-121610-801-1100ND
2017-03-081610-801-1000ND
2017-06-121610-801-12005.40 ppb
2017-09-111610-801-1100ND
2017-12-121610-801-1400ND
2017-12-121610-004-1400ND
2018-03-161610-801-1200ND
2018-06-111610-801-14001.25 ppb
2018-09-101610-801-0940ND
2018-09-101610-002-0940ND
2018-12-111610-801-132526.7 ppb
2019-03-111610-801-132042.4 ppb
2019-06-101610-801-112031.6 ppb
2019-09-091610-801-121556.3 ppb
2019-12-091610-801-13058.42 ppb