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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Portland

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

 

51

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20145.60 ppb71ND - 39.2 ppb
2015ND90ND
2016ND90ND
2017ND90ND
20180.160 ppb101ND - 1.60 ppb
2019ND70ND

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
2014-06-031415700060239.2 ppb
2014-06-0314157003702ND
2014-08-2014233012402ND
2014-08-2014233012502ND
2014-10-1314289002701ND
2014-10-2714303004002ND
2014-10-2714303004102ND
2015-01-2915030002202ND
2015-01-2915030002102ND
2015-04-2815120013102ND
2015-04-2815120013002ND
2015-07-2815211003702ND
2015-07-2815211003602ND
2015-10-2715301002202ND
2015-10-2715301001601ND
2015-10-2715301002102ND
2016-01-2616028004202ND
2016-01-2616028004102ND
2016-04-2616119005402ND
2016-04-2616119005302ND
2016-07-1216196012702ND
2016-07-1216196012202ND
2016-10-1116287000902ND
2016-10-1116287000802ND
2016-10-1116287001001ND
2017-01-1017012005102ND
2017-01-1017012005202ND
2017-04-1017102001502ND
2017-04-1017102001602ND
2017-07-1017193001002ND
2017-07-1017193000902ND
2017-10-0917285002402ND
2017-10-0917285002201ND
2017-10-0917285002302ND
2018-01-0918010001401ND
2018-01-0918010001501ND
2018-04-1018102002502ND
2018-04-1018102002602ND
2018-07-0918193007602ND
2018-07-0918193007502ND
2018-10-0918284001201ND
2018-10-0918284001002ND
2018-10-09182840011021.60 ppb
2018-11-2718333001901ND
2019-01-1419017002002ND
2019-01-1419017001902ND
2019-08-0619220014902ND
2019-08-0619220015002ND
2019-10-0719283004302ND
2019-10-0719283004402ND
2019-10-2119297000401ND