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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

City of San Jose - EVG/EDV/COY

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

 

196

Samples

0

Samples exceeding legal limit (MCL)

184

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
201415.7 ppb3532ND - 25.0 ppb
201514.0 ppb32326.28 ppb - 30.9 ppb
201612.1 ppb32322.54 ppb - 38.9 ppb
20175.77 ppb3326ND - 12.9 ppb
201811.3 ppb32322.58 ppb - 18.5 ppb
201910.9 ppb3230ND - 23.5 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
2014-01-149590-900-080525.0 ppb
2014-01-149590-901-084523.0 ppb
2014-01-149590-902-105524.0 ppb
2014-01-149590-903-094222.0 ppb
2014-01-149590-904-111819.0 ppb
2014-01-149590-905-103321.0 ppb
2014-01-149590-906-091523.0 ppb
2014-01-149590-907-100625.0 ppb
2014-01-219590-005-0914ND
2014-01-219590-006-0839ND
2014-02-189588-012-0902ND
2014-04-081610-900-111821.5 ppb
2014-04-081610-901-104720.9 ppb
2014-04-081610-902-083520.8 ppb
2014-04-081610-903-095520.9 ppb
2014-04-081610-904-081514.0 ppb
2014-04-081610-905-085622.5 ppb
2014-04-081610-906-102420.6 ppb
2014-04-081610-907-092524.3 ppb
2014-07-081610-900-113715.6 ppb
2014-07-081610-901-112015.1 ppb
2014-07-081610-902-090420.4 ppb
2014-07-081610-903-095014.7 ppb
2014-07-081610-904-084323.2 ppb
2014-07-081610-905-092517.5 ppb
2014-07-081610-906-105914.2 ppb
2014-07-081610-907-101517.7 ppb
2014-10-141610-900-08057.80 ppb
2014-10-141610-901-08557.94 ppb
2014-10-141610-902-11028.06 ppb
2014-10-141610-903-09308.15 ppb
2014-10-141610-904-11208.66 ppb
2014-10-141610-905-10407.60 ppb
2014-10-141610-906-10157.92 ppb
2014-10-141610-907-09508.58 ppb
2015-01-131610-900-11058.64 ppb
2015-01-131610-901-104211.7 ppb
2015-01-131610-902-08409.38 ppb
2015-01-131610-903-094612.2 ppb
2015-01-131610-904-08186.96 ppb
2015-01-131610-905-090011.0 ppb
2015-01-131610-906-10166.32 ppb
2015-01-131610-907-09269.12 ppb
2015-04-141610-900-112915.8 ppb
2015-04-141610-901-105011.9 ppb
2015-04-141610-902-081015.1 ppb
2015-04-141610-903-10258.17 ppb
2015-04-141610-904-084516.7 ppb
2015-04-141610-905-093516.8 ppb
2015-04-141610-906-111016.7 ppb
2015-04-141610-907-095616.4 ppb
2015-07-141610-900-104018.9 ppb
2015-07-141610-901-111020.5 ppb
2015-07-141610-902-083526.9 ppb
2015-07-141610-903-092523.5 ppb
2015-07-141610-904-081030.9 ppb
2015-07-141610-905-085524.3 ppb
2015-07-141610-906-101525.4 ppb
2015-07-141610-907-094023.9 ppb
2015-10-131610-900-10206.76 ppb
2015-10-131610-901-09049.10 ppb
2015-10-131610-902-12007.22 ppb
2015-10-131610-903-09448.74 ppb
2015-10-131610-904-12186.28 ppb
2015-10-131610-905-11358.01 ppb
2015-10-131610-906-08308.05 ppb
2015-10-131610-907-10536.55 ppb
2016-01-121610-900-090534.1 ppb
2016-01-121610-901-084023.9 ppb
2016-01-121610-902-105938.9 ppb
2016-01-121610-903-080725.1 ppb
2016-01-121610-904-112231.9 ppb
2016-01-121610-905-103033.8 ppb
2016-01-121610-906-094228.6 ppb
2016-01-121610-907-101036.6 ppb
2016-04-121610-004-12003.25 ppb
2016-04-121610-900-10493.06 ppb
2016-04-121610-901-10262.54 ppb
2016-04-121610-902-11443.06 ppb
2016-04-121610-903-09302.69 ppb
2016-04-121610-905-11243.15 ppb
2016-04-121610-906-09032.87 ppb
2016-04-121610-907-09543.12 ppb
2016-07-121610-900-08204.67 ppb
2016-07-121610-901-08534.90 ppb
2016-07-121610-902-11333.73 ppb
2016-07-121610-903-10154.77 ppb
2016-07-121610-904-11563.70 ppb
2016-07-121610-905-11103.78 ppb
2016-07-121610-906-09214.18 ppb
2016-07-121610-907-10423.95 ppb
2016-10-111610-900-125610.5 ppb
2016-10-111610-901-12368.68 ppb
2016-10-111610-902-10368.58 ppb
2016-10-111610-903-11489.26 ppb
2016-10-111610-904-10079.18 ppb
2016-10-111610-905-11078.98 ppb
2016-10-111610-906-12179.43 ppb
2016-10-111610-907-112610.9 ppb
2017-01-101610-900-094510.7 ppb
2017-01-101610-901-092212.0 ppb
2017-01-101610-902-104012.6 ppb
2017-01-101610-903-080112.3 ppb
2017-01-101610-904-11098.56 ppb
2017-01-101610-905-101311.2 ppb
2017-01-101610-906-082112.9 ppb
2017-01-101610-907-08547.76 ppb
2017-04-111610-900-08259.36 ppb
2017-04-111610-901-08509.10 ppb
2017-04-111610-902-09468.22 ppb
2017-04-111610-903-11257.98 ppb
2017-04-111610-904-10106.89 ppb
2017-04-111610-905-10359.32 ppb
2017-04-111610-906-09158.22 ppb
2017-04-111610-907-10589.43 ppb
2017-07-111610-900-08474.65 ppb
2017-07-111610-901-09335.07 ppb
2017-07-111610-902-11143.14 ppb
2017-07-111610-903-10185.62 ppb
2017-07-111610-904-1126ND
2017-07-111610-905-1100ND
2017-07-111610-906-09585.46 ppb
2017-07-111610-907-10442.43 ppb
2017-09-125867-004-0943ND
2017-10-111610-900-08101.57 ppb
2017-10-111610-901-08392.17 ppb
2017-10-111610-902-1110ND
2017-10-111610-903-09352.00 ppb
2017-10-111610-904-1131ND
2017-10-111610-905-1045ND
2017-10-111610-906-09101.84 ppb
2017-10-111610-907-1005ND
2018-01-091610-900-12509.85 ppb
2018-01-091610-901-12216.80 ppb
2018-01-091610-902-084211.0 ppb
2018-01-091610-903-11162.58 ppb
2018-01-091610-904-09256.97 ppb
2018-01-091610-905-100011.0 ppb
2018-01-091610-906-11514.03 ppb
2018-01-091610-907-104115.2 ppb
2018-04-091610-900-085616.4 ppb
2018-04-091610-901-091918.5 ppb
2018-04-091610-902-110015.0 ppb
2018-04-091610-903-100110.7 ppb
2018-04-091610-904-112010.1 ppb
2018-04-091610-905-104116.4 ppb
2018-04-091610-906-094113.1 ppb
2018-04-091610-907-102014.5 ppb
2018-07-101610-900-102710.8 ppb
2018-07-101610-901-100811.0 ppb
2018-07-101610-902-081612.5 ppb
2018-07-101610-903-092510.9 ppb
2018-07-101610-904-080012.3 ppb
2018-07-101610-905-085113.4 ppb
2018-07-101610-906-09489.46 ppb
2018-07-101610-907-090611.2 ppb
2018-10-091610-900-103311.5 ppb
2018-10-091610-901-100111.4 ppb
2018-10-091610-902-081612.0 ppb
2018-10-091610-903-091911.0 ppb
2018-10-091610-904-083011.0 ppb
2018-10-091610-905-085011.0 ppb
2018-10-091610-906-09438.79 ppb
2018-10-091610-907-090511.5 ppb
2019-01-081610-900-083720.0 ppb
2019-01-081610-901-090020.8 ppb
2019-01-081610-902-094022.2 ppb
2019-01-081610-903-105820.7 ppb
2019-01-081610-904-100222.8 ppb
2019-01-081610-905-114223.5 ppb
2019-01-081610-906-102921.0 ppb
2019-01-081610-907-111821.9 ppb
2019-04-091610-900-110212.3 ppb
2019-04-091610-901-08165.29 ppb
2019-04-091610-902-101812.8 ppb
2019-04-091610-903-09215.79 ppb
2019-04-091610-904-103810.9 ppb
2019-04-091610-905-095910.0 ppb
2019-04-091610-906-08413.92 ppb
2019-04-091610-907-094015.6 ppb
2019-07-091610-900-080010.3 ppb
2019-07-091610-901-08259.07 ppb
2019-07-091610-902-102510.7 ppb
2019-07-091610-903-092011.1 ppb
2019-07-091610-904-104110.6 ppb
2019-07-091610-905-100610.5 ppb
2019-07-091610-906-085510.7 ppb
2019-07-091610-907-094211.6 ppb
2019-10-081610-900-07493.17 ppb
2019-10-081610-901-08192.91 ppb
2019-10-081610-902-10272.41 ppb
2019-10-081610-903-09203.53 ppb
2019-10-081610-904-1045ND
2019-10-081610-905-0958ND
2019-10-081610-906-08592.50 ppb
2019-10-081610-907-09391.64 ppb