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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Files Valley Water Supply Corporation

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

13

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20142.18 ppb441.10 ppb - 3.00 ppb
20150.675 ppb41ND - 2.70 ppb
20160.250 ppb41ND - 1.000 ppb
20171.000 ppb43ND - 1.52 ppb
20181.36 ppb42ND - 2.72 ppb
20190.943 ppb42ND - 2.25 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
2014-02-18AC432372.20 ppb
2014-05-22AC550403.00 ppb
2014-08-20AC645931.10 ppb
2014-12-10AC743372.40 ppb
2015-03-16AC844022.70 ppb
2015-06-17AC96359ND
2015-07-29AD01503ND
2015-12-03AD15403ND
2016-02-17AD23902ND
2016-05-03AD35059ND
2016-09-06AD47889ND
2016-12-06AD609041.000 ppb
2017-03-07Q17095060031.47 ppb
2017-05-08Q17187260021.01 ppb
2017-08-16Q1736366002ND
2017-11-28Q17602070021.52 ppb
2018-02-15Q18066990032.72 ppb
2018-05-16Q1820013002ND
2018-09-12Q18361610012.70 ppb
2018-11-29Q1848867001ND
2019-02-05Q1905328001ND
2019-05-07Q19215490021.52 ppb
2019-09-18Q1967049002ND
2019-12-09Q19795750022.25 ppb