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EWG's Tap Water Database — 2019 UPDATE

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Bromoform

Middleton Water Department

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.

 

48

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.548 ppb1812ND - 1.40 ppb
20130.974 ppb10100.580 ppb - 1.30 ppb
20140.793 ppb880.740 ppb - 0.850 ppb
20150.239 ppb166ND - 0.840 ppb
2016ND160ND
2017ND160ND

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
2015-03-06ND
2015-03-06ND
2015-03-06ND
2015-03-06ND
2015-06-04ND
2015-06-04ND
2015-06-04ND
2015-06-04ND
2015-09-080.550 ppb
2015-09-080.550 ppb
2015-09-08ND
2015-09-08ND
2015-12-070.520 ppb
2015-12-070.520 ppb
2015-12-070.840 ppb
2015-12-070.840 ppb
2016-03-09ND
2016-03-09ND
2016-03-09ND
2016-03-09ND
2016-06-03ND
2016-06-03ND
2016-06-03ND
2016-06-03ND
2016-09-07ND
2016-09-07ND
2016-09-07ND
2016-09-07ND
2016-12-07ND
2016-12-07ND
2016-12-07ND
2016-12-07ND
2017-03-10ND
2017-03-10ND
2017-03-10ND
2017-03-10ND
2017-06-09ND
2017-06-09ND
2017-06-09ND
2017-06-09ND
2017-09-07ND
2017-09-07ND
2017-09-07ND
2017-09-07ND
2017-12-08ND
2017-12-08ND
2017-12-08ND
2017-12-08ND