Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Bromoform

City of Ottawa

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)

14

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.141 ppb164ND - 0.600 ppb
20150.644 ppb164ND - 2.70 ppb
2016ND160ND
2017ND160ND
20180.145 ppb164ND - 0.670 ppb
20190.0675 ppb162ND - 0.550 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
2014-02-1160182ND
2014-02-1160178ND
2014-02-1160174ND
2014-02-1160172ND
2014-05-061106350.560 ppb
2014-05-061106340.520 ppb
2014-05-061106330.600 ppb
2014-05-061106320.570 ppb
2014-08-11171617ND
2014-08-11171616ND
2014-08-11171618ND
2014-08-11171619ND
2014-11-10229819ND
2014-11-10229817ND
2014-11-10229814ND
2014-11-10229811ND
2015-02-11277375ND
2015-02-11277374ND
2015-02-11277373ND
2015-02-11277372ND
2015-05-12331962ND
2015-05-12331963ND
2015-05-12331965ND
2015-05-12331964ND
2015-08-10380679ND
2015-08-10380678ND
2015-08-10380677ND
2015-08-10380676ND
2015-11-044279202.70 ppb
2015-11-044279192.60 ppb
2015-11-044279182.60 ppb
2015-11-044279172.40 ppb
2016-02-16493394ND
2016-02-16493393ND
2016-02-16493395ND
2016-02-16493396ND
2016-05-24550888ND
2016-05-24550887ND
2016-05-24550886ND
2016-05-24550885ND
2016-08-23607525ND
2016-08-23607524ND
2016-08-23607523ND
2016-08-23607522ND
2016-11-14658851ND
2016-11-14658854ND
2016-11-14658853ND
2016-11-14658852ND
2017-02-13707782ND
2017-02-13707781ND
2017-02-13707780ND
2017-02-13707779ND
2017-05-17762309ND
2017-05-17762308ND
2017-05-17762307ND
2017-05-17762306ND
2017-08-21822372ND
2017-08-21822371ND
2017-08-21822373ND
2017-08-21822374ND
2017-11-14877660ND
2017-11-14877659ND
2017-11-14877658ND
2017-11-14877657ND
2018-02-14907412ND
2018-02-14907411ND
2018-02-14907409ND
2018-02-14907408ND
2018-05-23974267ND
2018-05-23974268ND
2018-05-23974270ND
2018-05-23974269ND
2018-08-2210294560.670 ppb
2018-08-2210294550.550 ppb
2018-08-2210294540.560 ppb
2018-08-2210294530.540 ppb
2018-11-271081170ND
2018-11-271081169ND
2018-11-271081168ND
2018-11-271081167ND
2019-02-121119812ND
2019-02-121119810ND
2019-02-121119814ND
2019-02-121119816ND
2019-05-201157465ND
2019-05-201157464ND
2019-05-201157463ND
2019-05-201157462ND
2019-08-281229807ND
2019-08-281229806ND
2019-08-281229805ND
2019-08-281229804ND
2019-11-2012776090.550 ppb
2019-11-201277612ND
2019-11-201277611ND
2019-11-2012776100.530 ppb