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EWG's Tap Water Database — 2019 UPDATE

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Bromoform

Waterloo Water Works

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.

 

28

Samples

0

Samples exceeding legal limit (MCL)

13

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.185 ppb82ND - 0.750 ppb
20130.376 ppb125ND - 1.01 ppb
20140.265 ppb21ND - 0.530 ppb
20150.770 ppb220.730 ppb - 0.810 ppb
20160.670 ppb220.520 ppb - 0.820 ppb
20170.315 ppb21ND - 0.630 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
2012-07-191918819ND
2012-07-1919188170.750 ppb
2012-07-1919188180.730 ppb
2012-07-191918820ND
2012-10-311944629ND
2012-10-311944627ND
2012-10-311944628ND
2012-10-311944630ND
2013-01-2219580270.790 ppb
2013-01-2219580260.920 ppb
2013-01-2219580250.830 ppb
2013-01-2219580241.01 ppb
2013-04-1119738140.960 ppb
2013-04-111973817ND
2013-04-111973816ND
2013-04-111973815ND
2013-07-181993049ND
2013-07-181993050ND
2013-07-181993051ND
2013-07-181993052ND
2014-07-162065521ND
2014-07-1620655200.530 ppb
2015-07-071G50517-010.810 ppb
2015-07-071G50517-020.730 ppb
2016-07-201G61634-010.820 ppb
2016-07-201G61634-020.520 ppb
2017-07-111G70795-010.630 ppb
2017-07-111G70795-02ND