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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Highway 84 West Water Supply

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.

MORE ABOUT THIS CONTAMINANT

 

92

Samples

0

Samples exceeding legal limit (MCL)

72

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.967 ppb206ND - 3.46 ppb
201510.3 ppb108ND - 25.2 ppb
201623.5 ppb101020.2 ppb - 28.4 ppb
201724.4 ppb20203.10 ppb - 46.7 ppb
201820.7 ppb161618.7 ppb - 22.4 ppb
201914.4 ppb1612ND - 20.1 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
2014-01-1512703962.97 ppb
2014-01-1512703953.24 ppb
2014-01-1512703962.97 ppb
2014-01-1512703953.24 ppb
2014-04-0912919753.46 ppb
2014-04-091291976ND
2014-04-091291976ND
2014-04-0912919753.46 ppb
2014-07-07AD93238ND
2014-07-07AD93239ND
2014-07-07AD93239ND
2014-07-07AD93238ND
2014-07-161318243ND
2014-07-161318244ND
2014-07-161318244ND
2014-07-161318243ND
2014-10-081340785ND
2014-10-081340786ND
2014-10-081340786ND
2014-10-081340785ND
2015-01-1413645431.05 ppb
2015-01-1413645441.76 ppb
2015-01-1413645441.76 ppb
2015-01-1413645431.05 ppb
2015-04-151387426ND
2015-04-151387426ND
2015-04-293518615700325.2 ppb
2015-04-293518615700423.4 ppb
2015-04-293518615700423.4 ppb
2015-04-293518615700325.2 ppb
2016-04-13148240228.4 ppb
2016-04-13148240228.4 ppb
2016-07-13150694223.8 ppb
2016-07-13150694322.5 ppb
2016-07-13150694322.5 ppb
2016-07-13150694223.8 ppb
2016-10-12153261720.2 ppb
2016-10-12153261622.6 ppb
2016-10-12153261720.2 ppb
2016-10-12153261622.6 ppb
2017-01-253529149000143.2 ppb
2017-01-253529149000246.7 ppb
2017-01-253529149000246.7 ppb
2017-01-253529149000143.2 ppb
2017-04-183530767000215.2 ppb
2017-04-183530767000115.7 ppb
2017-04-183530767000215.2 ppb
2017-04-183530767000115.7 ppb
2017-05-083531161000524.5 ppb
2017-05-083531161000621.5 ppb
2017-05-083531161000621.5 ppb
2017-05-083531161000524.5 ppb
2017-07-183532512100124.6 ppb
2017-07-183532512100228.7 ppb
2017-07-183532512100228.7 ppb
2017-07-183532512100124.6 ppb
2017-10-103534138700220.7 ppb
2017-10-10353413870013.10 ppb
2017-10-10353413870013.10 ppb
2017-10-103534138700220.7 ppb
2018-01-093536784200118.7 ppb
2018-01-093536784200219.0 ppb
2018-01-093536784200118.7 ppb
2018-01-093536784200219.0 ppb
2018-04-183538726500121.8 ppb
2018-04-183538726500220.9 ppb
2018-04-183538726500121.8 ppb
2018-04-183538726500220.9 ppb
2018-07-253540730800219.2 ppb
2018-07-253540730800121.5 ppb
2018-07-253540730800121.5 ppb
2018-07-253540730800219.2 ppb
2018-10-103542391700122.4 ppb
2018-10-103542391700221.7 ppb
2018-10-103542391700122.4 ppb
2018-10-103542391700221.7 ppb
2019-01-093544180500219.7 ppb
2019-01-093544180500118.5 ppb
2019-01-093544180500118.5 ppb
2019-01-093544180500219.7 ppb
2019-04-233546434400219.2 ppb
2019-04-233546434400219.2 ppb
2019-04-233546434400118.8 ppb
2019-04-233546434400118.8 ppb
2019-07-153548352000218.9 ppb
2019-07-153548352000120.1 ppb
2019-07-153548352000120.1 ppb
2019-07-153548352000218.9 ppb
2019-10-0235502607001ND
2019-10-0235502607002ND
2019-10-0235502607001ND
2019-10-0235502607002ND