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EWG's Tap Water Database

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Bromoform

Arapahoe Cnty Wwwa

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)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20101.06 ppb73ND - 3.20 ppb
20110.168 ppb41ND - 0.670 ppb
20121.01 ppb73ND - 3.30 ppb
201333.2 ppb1133.2 ppb
201410.2 ppb1110.2 ppb
20151.95 ppb441.80 ppb - 2.10 ppb

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 0.5 ppb

The 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.

EPA Maximum Contaminant
Level Goal (MCLG)0 ppb

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppb = parts per billion.

All test results

Date Result
2010-01-25ND
2010-01-25ND
2010-01-253.20 ppb
2010-02-013.00 ppb
2010-02-01ND
2010-04-05ND
2010-04-051.20 ppb
2011-01-19ND
2011-04-010.670 ppb
2011-04-01ND
2011-04-01ND
2012-01-13ND
2012-01-133.30 ppb
2012-01-231.70 ppb
2012-01-23ND
2012-04-06ND
2012-04-06ND
2012-04-092.10 ppb
2013-01-0833.2 ppb
2014-11-1110.2 ppb
2015-05-052.10 ppb
2015-05-052.10 ppb
2015-05-051.80 ppb
2015-05-051.80 ppb