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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Danville

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

 

58

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND100ND
2015ND80ND
2016ND120ND
2017ND100ND
2018ND90ND
2019ND90ND

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
2014-03-1814079007002ND
2014-03-1814079006902ND
2014-03-1814079006801ND
2014-05-1314135000402ND
2014-05-1314135000502ND
2014-08-1214226003402ND
2014-08-1214226003302ND
2014-11-1814324004002ND
2014-11-1814324003602ND
2014-11-1814324003901ND
2015-03-1815078007602ND
2015-06-0315155008002ND
2015-06-0315155007902ND
2015-08-1915232003202ND
2015-08-1915232003302ND
2015-10-2115295005501ND
2015-11-1015316001302ND
2015-11-1015316001402ND
2016-01-1216015000209ND
2016-02-2216056002202ND
2016-02-2216056002302ND
2016-05-1716140000602ND
2016-05-1716140000402ND
2016-05-2516147010802ND
2016-05-2516147010702ND
2016-08-1516231005302ND
2016-08-1516231005402ND
2016-10-1216288004601ND
2016-11-2116327000701ND
2016-11-2116327000501ND
2017-01-1117013000201ND
2017-02-1317046001802ND
2017-02-1317046002002ND
2017-05-1617138006002ND
2017-05-1617138005802ND
2017-08-2817242003302ND
2017-08-2817242003202ND
2017-10-1617292000601ND
2017-11-2817333002402ND
2017-11-2817333002302ND
2018-02-1318046003802ND
2018-02-1318046004002ND
2018-05-1418137003502ND
2018-05-1418137003302ND
2018-08-1418228007802ND
2018-08-1418228007702ND
2018-10-0818283004201ND
2018-11-1218319010602ND
2018-11-1218319010502ND
2019-01-1619017008009ND
2019-02-1819052002402ND
2019-02-1819052002602ND
2019-05-1419136006302ND
2019-05-1419136006402ND
2019-08-1219227007802ND
2019-08-1219227007902ND
2019-11-0519311011102ND
2019-11-0519311010902ND