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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

City of Alamo Heights

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

 

34

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.70 ppb111.70 ppb
20150.750 ppb63ND - 1.80 ppb
2016ND60ND
20170.167 ppb61ND - 1.000 ppb
20180.256 ppb92ND - 1.20 ppb
20190.183 ppb61ND - 1.10 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
2014-07-25AC612181.70 ppb
2015-04-27AC89591ND
2015-04-27AC895851.30 ppb
2015-04-27AC895931.40 ppb
2015-04-27AC89587ND
2015-04-27AC89595ND
2015-06-23AC970861.80 ppb
2016-03-15AD28830ND
2016-03-15AD28808ND
2016-03-15AD28810ND
2016-03-15AD28804ND
2016-03-15AD28838ND
2016-07-06AD43126ND
2017-04-10AD791941.000 ppb
2017-04-10AD79192ND
2017-04-10AD79188ND
2017-04-10AD79204ND
2017-04-10AD79190ND
2017-06-16AD87438ND
2018-01-10AE086511.10 ppb
2018-01-10AE08653ND
2018-01-10AE08663ND
2018-01-10AE08665ND
2018-01-10AE086591.20 ppb
2018-04-09AE21698ND
2018-06-04AE28494ND
2018-08-03AE35854ND
2018-10-12AE43450ND
2019-03-01AE56929ND
2019-03-27AE602321.10 ppb
2019-03-27AE60222ND
2019-03-27AE60258ND
2019-03-27AE60220ND
2019-06-21AE71676ND