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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

Harris County MUD 157

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane 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

 

92

Samples

0

Samples exceeding legal limit (MCL)

49

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND30ND
20151.77 ppb1611ND - 6.30 ppb
20160.656 ppb189ND - 1.60 ppb
20170.537 ppb198ND - 1.70 ppb
20181.23 ppb1811ND - 6.40 ppb
20190.650 ppb1810ND - 1.40 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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
2014-06-16AC56959ND
2014-06-16AC56958ND
2014-08-07AC62556ND
2015-05-15AC922611.70 ppb
2015-05-15AC92291ND
2015-05-15AC922601.40 ppb
2015-05-15AC92250ND
2015-05-15AC923461.70 ppb
2015-05-15AC923501.000 ppb
2015-07-28AD01206ND
2015-07-28AD01200ND
2015-07-28AD012291.20 ppb
2015-07-28AD012041.000 ppb
2015-09-29AD089951.000 ppb
2015-12-07AD15794ND
2015-12-07AD156856.30 ppb
2015-12-07AD157126.00 ppb
2015-12-07AD157095.40 ppb
2015-12-07AD157111.60 ppb
2016-02-11AD233331.30 ppb
2016-02-11AD23387ND
2016-02-11AD23379ND
2016-02-11AD233281.10 ppb
2016-02-11AD23332ND
2016-02-11AD23331ND
2016-04-27AD344071.10 ppb
2016-04-27AD34401ND
2016-04-27AD344081.60 ppb
2016-04-27AD344091.40 ppb
2016-09-16AD499811.30 ppb
2016-09-16AD499761.30 ppb
2016-09-16AD49978ND
2016-09-16AD50005ND
2016-11-18AD587871.30 ppb
2016-11-18AD58785ND
2016-11-18AD58784ND
2016-11-18AD587831.40 ppb
2017-02-15AD708251.20 ppb
2017-02-15AD708271.20 ppb
2017-02-15AD708221.40 ppb
2017-02-15AD708291.000 ppb
2017-03-14AD74945ND
2017-03-14AD74883ND
2017-05-17AD84623ND
2017-05-17AD846241.20 ppb
2017-05-17AD846311.20 ppb
2017-05-17AD84630ND
2017-08-16AD93192ND
2017-08-16AD93193ND
2017-08-16AD93194ND
2017-08-16AD93195ND
2017-10-24AE017791.30 ppb
2017-10-24AE01777ND
2017-10-24AE017611.70 ppb
2017-10-24AE01775ND
2017-12-15AE07852ND
2018-02-05AE121741.20 ppb
2018-02-05AE121641.20 ppb
2018-02-05AE121431.10 ppb
2018-02-05AE121381.20 ppb
2018-03-28AE20419ND
2018-03-28AE20383ND
2018-05-03AE250371.60 ppb
2018-05-03AE250321.10 ppb
2018-05-03AE250331.20 ppb
2018-05-03AE250384.10 ppb
2018-08-22AE380651.50 ppb
2018-08-22AE380676.40 ppb
2018-08-22AE38064ND
2018-08-22AE38063ND
2018-11-19AE46444ND
2018-11-19AE46449ND
2018-11-19AE464461.60 ppb
2018-11-19AE46467ND
2019-02-20AE550071.000 ppb
2019-02-20AE55091ND
2019-02-20AE550041.10 ppb
2019-02-20AE55008ND
2019-02-20AE550091.000 ppb
2019-06-05AE692411.30 ppb
2019-06-05AE69240ND
2019-06-05AE692381.10 ppb
2019-06-05AE692391.30 ppb
2019-08-14AE78587ND
2019-08-14AE78584ND
2019-08-14AE785881.40 ppb
2019-08-14AE78585ND
2019-10-02AE85502ND
2019-10-02AE855031.30 ppb
2019-10-02AE85501ND
2019-10-02AE854981.000 ppb
2019-12-19AE928851.20 ppb