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EWG's Tap Water Database — 2019 UPDATE

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Bromoform

Oswego, City of

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

10

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.928 ppb43ND - 1.80 ppb
20130.875 ppb42ND - 2.10 ppb
2014ND40ND
20150.365 ppb42ND - 0.860 ppb
20160.173 ppb41ND - 0.690 ppb
20170.413 ppb42ND - 0.930 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
2012-01-31573078TF0.610 ppb
2012-04-16577594TFND
2012-07-23582213TF1.30 ppb
2012-10-22586971TF1.80 ppb
2013-01-28591890TF2.10 ppb
2013-04-22594912TFND
2013-07-22599348TF1.40 ppb
2013-10-22604845TFND
2014-01-0528174ND
2014-04-2199325ND
2014-07-21154419ND
2014-10-20216942ND
2015-01-20264228ND
2015-04-203158390.600 ppb
2015-07-20369159ND
2015-10-194208770.860 ppb
2016-01-04468656ND
2016-04-055201130.690 ppb
2016-07-18584682ND
2016-10-11641340ND
2017-01-096794930.930 ppb
2017-04-18743520ND
2017-07-248031120.720 ppb
2017-10-23865405ND