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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Bethesda WSC

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

 

171

Samples

0

Samples exceeding legal limit (MCL)

57

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.65 ppb2011ND - 18.3 ppb
20150.843 ppb3118ND - 2.70 ppb
20160.429 ppb3210ND - 1.83 ppb
20170.436 ppb317ND - 2.64 ppb
20180.281 ppb317ND - 1.42 ppb
20190.165 ppb264ND - 1.09 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
2014-03-20Q1409114001ND
2014-03-20Q1409114002ND
2014-03-20Q1409114003ND
2014-03-20Q1409114004ND
2014-06-13Q14213280121.20 ppb
2014-06-13Q1421328013ND
2014-06-13Q14213280141.30 ppb
2014-06-13Q142132800118.3 ppb
2014-09-08Q14419540031.000 ppb
2014-09-08Q1441954004ND
2014-09-08Q14419540011.000 ppb
2014-09-08Q1441954002ND
2014-11-19Q14567300051.30 ppb
2014-11-19Q1456730006ND
2014-11-19Q14567300071.50 ppb
2014-11-19Q1456730008ND
2014-11-19Q14567300132.25 ppb
2014-11-19Q14567300151.84 ppb
2014-11-19Q14567300171.04 ppb
2014-11-19Q14567300192.32 ppb
2015-02-03Q1504044002ND
2015-02-03Q15040440062.70 ppb
2015-02-03Q1504044007ND
2015-02-03Q15040440082.50 ppb
2015-02-03Q15040440051.60 ppb
2015-04-22Q1515039035ND
2015-04-22Q1515039037ND
2015-04-22Q15150390401.09 ppb
2015-04-22Q1515039041ND
2015-04-22Q15150390431.29 ppb
2015-04-22Q15150390461.09 ppb
2015-04-22Q15150390251.15 ppb
2015-04-22Q15150390281.58 ppb
2015-04-22Q15150390301.30 ppb
2015-04-22Q15150390321.38 ppb
2015-04-22Q15150390341.42 ppb
2015-04-22Q15150390211.42 ppb
2015-04-22Q15150390221.47 ppb
2015-04-22Q15150390231.37 ppb
2015-04-22Q15150390241.64 ppb
2015-06-17Q1522842001ND
2015-08-04Q15302330011.06 ppb
2015-08-04Q1530233004ND
2015-08-04Q15302330071.01 ppb
2015-08-04Q1530233008ND
2015-08-04Q1530233009ND
2015-08-04Q15302330101.05 ppb
2015-11-02Q1543432001ND
2015-11-02Q1543432002ND
2015-11-02Q1543432003ND
2015-11-02Q1543432004ND
2016-02-17Q1607184002ND
2016-02-17Q16071840031.83 ppb
2016-02-17Q1607184008ND
2016-02-17Q1607184009ND
2016-02-17Q1607184010ND
2016-02-17Q1607184011ND
2016-03-21Q1611365004ND
2016-04-20Q1615721002ND
2016-04-20Q16157210031.68 ppb
2016-04-20Q16157210051.66 ppb
2016-04-20Q16157210141.18 ppb
2016-04-20Q1615721015ND
2016-04-20Q16157210161.48 ppb
2016-04-20Q16157210171.09 ppb
2016-06-16Q1624597001ND
2016-09-06Q1635394001ND
2016-09-06Q1635394002ND
2016-09-06Q1635394003ND
2016-09-06Q1635394004ND
2016-10-20Q1644787004ND
2016-10-20Q1644787010ND
2016-10-20Q1644787006ND
2016-10-20Q1644787012ND
2016-10-20Q1644787007ND
2016-11-08Q16482130301.33 ppb
2016-11-08Q16482130321.18 ppb
2016-11-08Q16482130351.25 ppb
2016-11-08Q16482130361.04 ppb
2016-11-08Q1648213018ND
2016-11-08Q1648213019ND
2016-11-08Q1648213020ND
2016-11-08Q1648213021ND
2017-01-31Q1704122013ND
2017-01-31Q1704122015ND
2017-01-31Q1704122009ND
2017-01-31Q1704122010ND
2017-01-31Q1704122011ND
2017-01-31Q1704122024ND
2017-04-18Q1715805002ND
2017-04-18Q1715805003ND
2017-04-18Q17158050041.18 ppb
2017-04-18Q1715805005ND
2017-07-18Q1729512002ND
2017-07-18Q1729512003ND
2017-07-18Q1729512004ND
2017-07-18Q1729512005ND
2017-10-17Q1753293035ND
2017-10-17Q1753293001ND
2017-10-17Q1753293037ND
2017-10-17Q1753293033ND
2017-10-17Q1753293039ND
2017-10-17Q1753293032ND
2017-10-17Q1753293028ND
2017-10-17Q1753293023ND
2017-10-17Q1753293006ND
2017-10-17Q1753293030ND
2017-11-01Q17562230202.07 ppb
2017-11-01Q17562230221.94 ppb
2017-11-01Q1756223002ND
2017-11-01Q17562230231.50 ppb
2017-11-01Q17562230142.64 ppb
2017-11-01Q17562230421.56 ppb
2017-11-01Q17562230252.64 ppb
2018-02-21Q1807322004ND
2018-02-21Q1807322006ND
2018-02-21Q1807322007ND
2018-02-21Q1807322002ND
2018-02-21Q1807322008ND
2018-05-16Q1819957002ND
2018-05-16Q1819957003ND
2018-05-16Q1819957005ND
2018-05-16Q1819957008ND
2018-05-16Q1819957010ND
2018-05-16Q1819957011ND
2018-05-16Q1819957014ND
2018-05-16Q1819957015ND
2018-05-16Q1819957017ND
2018-05-16Q18199570361.26 ppb
2018-05-16Q18199570371.42 ppb
2018-05-16Q18199570381.28 ppb
2018-05-16Q18199570391.38 ppb
2018-07-25Q1829607002ND
2018-07-25Q1829607003ND
2018-07-25Q18296070041.19 ppb
2018-07-25Q1829607005ND
2018-10-19Q1842052014ND
2018-10-19Q1842052015ND
2018-10-19Q1842052017ND
2018-10-19Q18420520201.05 ppb
2018-10-19Q18420520221.13 ppb
2018-10-19Q1842052009ND
2018-10-19Q1842052010ND
2018-10-19Q1842052011ND
2018-10-19Q1842052012ND
2019-01-15Q1901990002ND
2019-01-15Q1901990003ND
2019-01-15Q1901990005ND
2019-01-15Q1901990013ND
2019-01-15Q1901990014ND
2019-01-15Q1901990015ND
2019-01-15Q1901990016ND
2019-04-11Q1914886003ND
2019-04-11Q1914886004ND
2019-04-11Q1914886007ND
2019-04-11Q1914886008ND
2019-04-11Q1914886010ND
2019-04-11Q1914886012ND
2019-04-11Q1914886030ND
2019-04-11Q1914886031ND
2019-04-11Q1914886032ND
2019-04-11Q1914886033ND
2019-08-06Q1951620002ND
2019-08-06Q1951620003ND
2019-08-06Q1951620004ND
2019-08-06Q1951620005ND
2019-10-07Q1971784007ND
2019-10-07Q19717840031.08 ppb
2019-10-07Q19717840041.09 ppb
2019-10-07Q19717840051.04 ppb
2019-10-07Q19717840061.09 ppb