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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Golden State Water Company (GSWC) - San Dimas

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

 

204

Samples

0

Samples exceeding legal limit (MCL)

168

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20145.65 ppb3432ND - 15.0 ppb
20155.41 ppb3430ND - 18.0 ppb
20165.69 ppb3432ND - 19.0 ppb
20172.16 ppb3416ND - 8.40 ppb
20183.56 ppb3432ND - 5.60 ppb
20191.88 ppb3426ND - 8.30 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
2014-01-249588-800-08508.20 ppb
2014-01-249588-801-074011.0 ppb
2014-01-249588-802-073013.0 ppb
2014-01-249588-803-081012.0 ppb
2014-01-249588-804-104515.0 ppb
2014-01-249588-805-075510.00 ppb
2014-01-249588-806-08259.20 ppb
2014-01-249588-807-103011.0 ppb
2014-02-199588-051-0930ND
2014-04-239588-800-08255.80 ppb
2014-04-239588-801-07354.70 ppb
2014-04-239588-802-07255.00 ppb
2014-04-239588-803-07554.90 ppb
2014-04-239588-804-10052.20 ppb
2014-04-239588-805-07454.70 ppb
2014-04-239588-806-08052.00 ppb
2014-04-239588-807-09508.70 ppb
2014-05-149588-014-1010ND
2014-07-249588-800-10554.30 ppb
2014-07-249588-801-11252.50 ppb
2014-07-249588-802-13354.60 ppb
2014-07-249588-803-11402.80 ppb
2014-07-249588-804-14003.10 ppb
2014-07-249588-805-11105.00 ppb
2014-07-249588-806-11552.70 ppb
2014-07-249588-807-12104.40 ppb
2014-10-279588-800-08456.20 ppb
2014-10-279588-801-07452.90 ppb
2014-10-279588-802-07354.80 ppb
2014-10-279588-803-08102.40 ppb
2014-10-279588-804-10454.30 ppb
2014-10-279588-805-07555.70 ppb
2014-10-279588-806-08201.80 ppb
2014-11-189588-807-09407.20 ppb
2015-01-289588-800-08306.00 ppb
2015-01-289588-801-07406.10 ppb
2015-01-289588-802-073018.0 ppb
2015-01-289588-803-08007.40 ppb
2015-01-289588-804-103015.0 ppb
2015-01-289588-805-07506.60 ppb
2015-01-289588-806-08105.50 ppb
2015-01-289588-807-09554.90 ppb
2015-02-189588-051-0920ND
2015-04-239588-800-08104.60 ppb
2015-04-239588-801-07154.10 ppb
2015-04-239588-802-07054.40 ppb
2015-04-239588-803-07353.90 ppb
2015-04-239588-804-09554.60 ppb
2015-04-239588-805-07254.00 ppb
2015-04-239588-806-07455.70 ppb
2015-04-239588-807-09406.20 ppb
2015-05-189588-014-0915ND
2015-07-279588-800-10255.20 ppb
2015-07-279588-801-09206.60 ppb
2015-07-279588-802-09104.90 ppb
2015-07-279588-803-09455.50 ppb
2015-07-279588-804-12106.20 ppb
2015-07-279588-805-09356.10 ppb
2015-07-279588-806-10007.10 ppb
2015-07-279588-807-11503.00 ppb
2015-10-289588-800-0930ND
2015-10-289588-801-08306.40 ppb
2015-10-289588-802-08154.90 ppb
2015-10-289588-803-08556.60 ppb
2015-10-289588-804-08005.30 ppb
2015-10-289588-805-0840ND
2015-10-289588-806-09102.60 ppb
2015-10-289588-807-10556.70 ppb
2016-01-259588-800-08408.30 ppb
2016-01-259588-801-074011.0 ppb
2016-01-259588-802-072519.0 ppb
2016-01-259588-803-08108.70 ppb
2016-01-259588-804-124018.0 ppb
2016-01-259588-805-08009.70 ppb
2016-01-259588-806-08207.40 ppb
2016-01-259588-807-12208.10 ppb
2016-02-169588-051-0825ND
2016-04-279588-800-08352.90 ppb
2016-04-279588-801-07403.20 ppb
2016-04-279588-802-07307.00 ppb
2016-04-279588-803-08053.60 ppb
2016-04-279588-804-10405.20 ppb
2016-04-279588-805-07501.80 ppb
2016-04-279588-806-08152.80 ppb
2016-04-279588-807-10152.60 ppb
2016-05-129588-014-0925ND
2016-07-259588-800-08305.50 ppb
2016-07-259588-801-07254.10 ppb
2016-07-259588-802-07104.90 ppb
2016-07-259588-803-07504.90 ppb
2016-07-259588-804-12104.20 ppb
2016-07-259588-805-07454.10 ppb
2016-07-259588-806-08003.90 ppb
2016-07-259588-807-11404.20 ppb
2016-10-259588-800-08302.40 ppb
2016-10-259588-801-07305.20 ppb
2016-10-259588-802-07205.40 ppb
2016-10-259588-803-08006.20 ppb
2016-10-259588-804-12304.90 ppb
2016-10-259588-805-07505.70 ppb
2016-10-259588-806-08102.90 ppb
2016-10-259588-807-12055.60 ppb
2017-01-059588-051-0800ND
2017-01-279588-800-08156.40 ppb
2017-01-279588-801-07256.50 ppb
2017-01-279588-802-07157.20 ppb
2017-01-279588-803-07457.30 ppb
2017-01-279588-804-10158.40 ppb
2017-01-279588-805-07356.60 ppb
2017-01-279588-806-07556.30 ppb
2017-01-279588-807-09554.40 ppb
2017-04-259588-800-0830ND
2017-04-259588-801-0720ND
2017-04-259588-802-0710ND
2017-04-259588-803-0800ND
2017-04-259588-804-1225ND
2017-04-259588-805-0745ND
2017-04-259588-806-0810ND
2017-04-259588-807-1200ND
2017-05-159588-014-0905ND
2017-07-259588-800-1420ND
2017-07-259588-801-1505ND
2017-07-259588-802-1520ND
2017-07-259588-803-1450ND
2017-07-259588-804-1545ND
2017-07-259588-805-1435ND
2017-07-259588-806-14051.20 ppb
2017-07-259588-807-1355ND
2017-10-279588-800-0830ND
2017-10-279588-801-07352.50 ppb
2017-10-279588-802-07252.40 ppb
2017-10-279588-803-08002.50 ppb
2017-10-279588-804-10252.80 ppb
2017-10-279588-805-07453.80 ppb
2017-10-279588-806-08102.70 ppb
2017-10-279588-807-10102.60 ppb
2018-01-269588-800-08404.00 ppb
2018-01-269588-801-07303.80 ppb
2018-01-269588-802-07205.30 ppb
2018-01-269588-803-08004.20 ppb
2018-01-269588-804-10404.70 ppb
2018-01-269588-805-07455.60 ppb
2018-01-269588-806-08155.50 ppb
2018-01-269588-807-10204.40 ppb
2018-02-159588-051-1045ND
2018-04-259588-800-08301.80 ppb
2018-04-259588-801-07204.80 ppb
2018-04-259588-802-07103.70 ppb
2018-04-259588-803-07553.40 ppb
2018-04-259588-804-11503.80 ppb
2018-04-259588-805-07404.20 ppb
2018-04-259588-806-08103.70 ppb
2018-04-259588-807-11354.20 ppb
2018-05-169588-014-0855ND
2018-07-279588-800-07304.30 ppb
2018-07-279588-801-06453.50 ppb
2018-07-279588-802-06353.50 ppb
2018-07-279588-803-07053.70 ppb
2018-07-279588-804-09103.80 ppb
2018-07-279588-805-06553.90 ppb
2018-07-279588-806-07153.80 ppb
2018-07-279588-807-08553.90 ppb
2018-10-269588-800-08555.60 ppb
2018-10-269588-801-07402.80 ppb
2018-10-269588-802-07302.50 ppb
2018-10-269588-803-08152.40 ppb
2018-10-269588-804-11003.00 ppb
2018-10-269588-805-08052.40 ppb
2018-10-269588-806-08252.20 ppb
2018-10-269588-807-10452.80 ppb
2019-01-259588-800-09258.30 ppb
2019-01-259588-801-08053.40 ppb
2019-01-259588-802-07504.50 ppb
2019-01-259588-803-08454.00 ppb
2019-01-259588-804-11454.10 ppb
2019-01-259588-805-08353.80 ppb
2019-01-259588-806-09003.50 ppb
2019-01-259588-807-11305.50 ppb
2019-02-119588-051-0835ND
2019-04-249588-800-0815ND
2019-04-249588-801-07101.40 ppb
2019-04-249588-802-07001.10 ppb
2019-04-249588-803-07351.20 ppb
2019-04-249588-804-10001.30 ppb
2019-04-249588-805-0720ND
2019-04-249588-806-07501.40 ppb
2019-04-249588-807-0945ND
2019-06-129588-014-0830ND
2019-07-249588-800-0825ND
2019-07-249588-801-07301.30 ppb
2019-07-249588-802-07151.20 ppb
2019-07-249588-803-07501.60 ppb
2019-07-249588-804-10201.40 ppb
2019-07-249588-805-0740ND
2019-07-249588-806-08001.20 ppb
2019-07-249588-807-10051.000 ppb
2019-10-259588-800-0820ND
2019-10-259588-801-07101.60 ppb
2019-10-259588-802-07001.60 ppb
2019-10-259588-803-07401.80 ppb
2019-10-259588-804-11552.10 ppb
2019-10-259588-805-07301.80 ppb
2019-10-259588-806-07502.10 ppb
2019-10-259588-807-11351.80 ppb