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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Western MWD (Arlington)

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

 

84

Samples

0

Samples exceeding legal limit (MCL)

27

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.464 ppb113ND - 2.50 ppb
20150.743 ppb146ND - 2.20 ppb
20160.295 ppb165ND - 1.40 ppb
20170.743 ppb115ND - 3.40 ppb
20180.168 ppb254ND - 1.60 ppb
20190.814 ppb74ND - 1.50 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
2014-01-064790-009-1130ND
2014-02-034790-007-1115ND
2014-02-034790-008-1130ND
2014-02-044790-013-12351.10 ppb
2014-05-054790-008-1115ND
2014-05-054790-009-1345ND
2014-05-074790-013-1030ND
2014-05-124790-007-1000ND
2014-08-054790-007-1400ND
2014-08-084790-013-10002.50 ppb
2014-11-044790-013-13301.50 ppb
2015-02-094790-013-13402.20 ppb
2015-02-094790-008-0945ND
2015-02-094790-009-1130ND
2015-02-094790-007-0930ND
2015-02-184790-009-1400ND
2015-05-044790-007-1350ND
2015-05-044790-008-1450ND
2015-05-064790-013-09001.70 ppb
2015-08-034790-013-10001.40 ppb
2015-08-044790-007-1310ND
2015-08-044790-008-1320ND
2015-11-024790-007-12501.80 ppb
2015-11-024790-008-12401.60 ppb
2015-11-034790-013-09301.70 ppb
2016-02-124790-009-1030ND
2016-02-134790-001-0930ND
2016-02-134790-004-10100.730 ppb
2016-02-134790-005-1030ND
2016-02-134790-003-0950ND
2016-03-294790-002-0705ND
2016-05-024790-007-1120ND
2016-05-024790-008-1140ND
2016-05-044790-013-12000.770 ppb
2016-08-014790-008-0945ND
2016-08-014790-007-0930ND
2016-08-024790-013-13151.10 ppb
2016-11-014790-007-0900ND
2016-11-014790-008-0930ND
2016-11-014790-009-11200.720 ppb
2016-11-014790-013-14401.40 ppb
2017-02-064790-009-10300.740 ppb
2017-02-074790-013-14453.40 ppb
2017-05-014790-007-1252ND
2017-05-014790-008-1441ND
2017-08-014790-007-1005ND
2017-08-014790-008-1110ND
2017-08-024790-013-15270.830 ppb
2017-09-054790-013-13551.90 ppb
2017-11-074790-008-0900ND
2017-11-074790-007-0845ND
2017-11-074790-013-12501.30 ppb
2018-02-214790-013-15001.000 ppb
2018-02-214790-009-0900ND
2018-02-214790-008-1200ND
2018-02-214790-007-1100ND
2018-02-274790-001-1130ND
2018-02-274790-002-1145ND
2018-02-274790-003-1200ND
2018-02-274790-004-1215ND
2018-02-274790-005-1230ND
2018-05-144790-008-1055ND
2018-05-144790-013-13300.700 ppb
2018-05-144790-007-1010ND
2018-05-294790-001-1525ND
2018-05-294790-002-1535ND
2018-05-294790-003-1545ND
2018-05-294790-004-1555ND
2018-05-294790-005-1605ND
2018-05-294790-007-1450ND
2018-06-044790-009-1130ND
2018-08-284790-013-14100.910 ppb
2018-08-284790-008-0930ND
2018-08-294790-007-1300ND
2018-11-054790-007-1000ND
2018-11-054790-008-1100ND
2018-11-064790-013-11451.60 ppb
2019-02-134790-013-10001.50 ppb
2019-03-044790-007-1315ND
2019-03-044790-008-1250ND
2019-03-044790-009-1235ND
2019-05-074790-013-12001.40 ppb
2019-08-134790-013-09251.30 ppb
2019-11-044790-013-14001.50 ppb