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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Ayer DPW Water Division

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

 

98

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.0857 ppb142ND - 0.600 ppb
2015ND180ND
2016ND120ND
2017ND140ND
2018ND180ND
2019ND220ND

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 Result
2014-08-19ND
2014-08-19ND
2014-08-19ND
2014-08-19ND
2014-08-19ND
2014-08-19ND
2014-08-19ND
2014-08-19ND
2014-08-190.600 ppb
2014-08-190.600 ppb
2014-08-19ND
2014-08-19ND
2014-11-18ND
2014-11-18ND
2015-03-16ND
2015-03-16ND
2015-05-13ND
2015-05-13ND
2015-08-04ND
2015-08-04ND
2015-08-04ND
2015-08-04ND
2015-08-04ND
2015-08-04ND
2015-08-04ND
2015-08-04ND
2015-08-04ND
2015-08-04ND
2015-08-04ND
2015-08-04ND
2015-08-17ND
2015-08-17ND
2016-08-02ND
2016-08-02ND
2016-09-12ND
2016-09-12ND
2016-09-12ND
2016-09-12ND
2016-09-12ND
2016-09-12ND
2016-09-12ND
2016-09-12ND
2016-09-12ND
2016-09-12ND
2017-08-31ND
2017-08-31ND
2017-09-18ND
2017-09-18ND
2017-09-18ND
2017-09-18ND
2017-09-18ND
2017-09-18ND
2017-09-18ND
2017-09-18ND
2017-09-18ND
2017-09-18ND
2017-09-18ND
2017-09-18ND
2018-06-13ND
2018-06-13ND
2018-08-14ND
2018-08-14ND
2018-08-14ND
2018-08-14ND
2018-08-14ND
2018-08-14ND
2018-08-14ND
2018-08-14ND
2018-08-14ND
2018-08-14ND
2018-08-14ND
2018-08-14ND
2018-08-14ND
2018-08-14ND
2018-08-14ND
2018-08-14ND
2019-03-05ND
2019-03-05ND
2019-03-05ND
2019-03-05ND
2019-08-14ND
2019-08-14ND
2019-09-19ND
2019-09-19ND
2019-09-19ND
2019-09-19ND
2019-09-19ND
2019-09-19ND
2019-09-19ND
2019-09-19ND
2019-09-19ND
2019-09-19ND
2019-09-19ND
2019-09-19ND
2019-09-19ND
2019-09-19ND
2019-12-10ND
2019-12-10ND