EWG's Tap Water Database — 2021 UPDATE


Dibromoacetic acid

Butler Waterworks

Dibromoacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids 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
20140.518 ppb440.280 ppb - 0.760 ppb
20150.763 ppb440.440 ppb - 1.10 ppb
20160.590 ppb440.490 ppb - 0.860 ppb
20170.633 ppb440.340 ppb - 0.810 ppb
20180.530 ppb110.530 ppb
20190.450 ppb110.450 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.04 ppb

The EWG Health Guideline of 0.04 ppb for dibromoacetic acid was defined in a peer-reviewed scientific study by EWG and represents a on-in-a-million lifetime cancer risk level. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date Lab ID Result
2014-02-127706110.440 ppb
2014-05-137854080.590 ppb
2014-08-128099010.760 ppb
2014-11-138318270.280 ppb
2015-02-118430500.800 ppb
2015-05-138597461.10 ppb
2015-08-118765360.710 ppb
2015-11-128940080.440 ppb
2016-02-119052080.510 ppb
2016-05-109204590.860 ppb
2016-08-099382550.500 ppb
2016-11-109586810.490 ppb
2017-02-149738040.810 ppb
2017-05-119891910.730 ppb
2017-08-1510116120.650 ppb
2017-11-0710285200.340 ppb
2018-04-1010495450.530 ppb
2019-04-1211152470.450 ppb