EWG's Tap Water Database — 2021 UPDATE



Whitehall Waterworks

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.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20140.810 ppb110.810 ppb
20150.380 ppb110.380 ppb
20160.510 ppb110.510 ppb
20170.620 ppb110.620 ppb
20190.220 ppb110.220 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
2014-08-208121970.810 ppb
2015-09-098818930.380 ppb
2016-08-309421310.510 ppb
2017-08-2910145980.620 ppb
2019-09-0311452600.220 ppb