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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

California Water Service - San Carlos

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

 

96

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.135 ppb162ND - 1.37 ppb
2015ND160ND
2016ND160ND
2017ND160ND
2018ND160ND
2019ND160ND

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
2014-02-055701-902-08401.37 ppb
2014-02-055701-900-08150.790 ppb
2014-02-055701-901-0750ND
2014-02-055701-903-0900ND
2014-05-075701-903-1045ND
2014-05-075701-902-1105ND
2014-05-075701-901-0950ND
2014-05-075701-900-1015ND
2014-08-065701-903-0855ND
2014-08-065701-902-0930ND
2014-08-065701-901-0800ND
2014-08-065701-900-0830ND
2014-11-035701-902-0930ND
2014-11-035701-901-0825ND
2014-11-035701-903-1000ND
2014-11-035701-900-0855ND
2015-02-045701-903-0852ND
2015-02-045701-902-0852ND
2015-02-045701-901-0852ND
2015-02-045701-900-0852ND
2015-05-055701-903-0814ND
2015-05-055701-902-0814ND
2015-05-055701-900-0814ND
2015-05-055701-901-0814ND
2015-08-035701-900-0802ND
2015-08-035701-903-0802ND
2015-08-035701-902-0802ND
2015-08-035701-901-0802ND
2015-11-035810-901-0930ND
2015-11-035810-900-1010ND
2015-11-035810-903-1025ND
2015-11-035810-902-1050ND
2016-02-025701-901-0905ND
2016-02-025701-900-0905ND
2016-02-025701-903-0905ND
2016-02-025701-902-0905ND
2016-05-025701-901-0711ND
2016-05-025701-900-0711ND
2016-05-025701-903-0711ND
2016-05-025701-902-0711ND
2016-08-025701-903-0908ND
2016-08-025701-901-0908ND
2016-08-025701-900-0908ND
2016-08-025701-902-0908ND
2016-11-075701-903-1250ND
2016-11-075701-901-1345ND
2016-11-075701-902-1315ND
2016-11-075701-900-1235ND
2017-02-065810-902-0940ND
2017-02-065810-903-0805ND
2017-02-065810-901-0915ND
2017-02-065810-900-0815ND
2017-05-015701-902-0855ND
2017-05-015701-900-0935ND
2017-05-015701-901-1000ND
2017-05-015701-903-0910ND
2017-08-095810-900-1455ND
2017-08-095810-901-1505ND
2017-08-095810-903-1425ND
2017-08-095810-902-1440ND
2017-11-075810-903-1045ND
2017-11-075810-900-1005ND
2017-11-075810-902-1020ND
2017-11-075810-901-0930ND
2018-02-055810-903-0830ND
2018-02-055810-900-0850ND
2018-02-055810-901-0810ND
2018-02-055810-902-0910ND
2018-05-075701-901-0849ND
2018-05-075701-902-0849ND
2018-05-075701-903-0849ND
2018-05-075701-900-0849ND
2018-08-065701-901-0814ND
2018-08-065701-903-0814ND
2018-08-065701-902-0814ND
2018-08-065701-900-0814ND
2018-11-055701-901-1029ND
2018-11-055701-903-1029ND
2018-11-055701-902-1029ND
2018-11-055701-900-1029ND
2019-02-065810-900-0855ND
2019-02-065810-902-0920ND
2019-02-065810-901-0835ND
2019-02-065810-903-0905ND
2019-05-075701-900-0904ND
2019-05-075701-902-0904ND
2019-05-075701-903-0904ND
2019-05-075701-901-0904ND
2019-08-065701-903-1115ND
2019-08-065701-902-1200ND
2019-08-065701-900-1145ND
2019-08-065701-901-1050ND
2019-11-135701-903-0950ND
2019-11-135701-902-1000ND
2019-11-135701-900-0935ND
2019-11-135701-901-0915ND