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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Douglas

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

 

102

Samples

0

Samples exceeding legal limit (MCL)

73

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.286 ppb213ND - 2.20 ppb
20152.10 ppb1613ND - 4.10 ppb
20161.46 ppb127ND - 3.66 ppb
20171.96 ppb2119ND - 4.61 ppb
20181.61 ppb1615ND - 3.02 ppb
20191.91 ppb16160.210 ppb - 3.61 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for dibromochloromethane 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
2014-01-23AI27073ND
2014-01-23AI270742.20 ppb
2014-01-23AI270752.10 ppb
2014-01-23AI27076ND
2014-04-30AI39261ND
2014-04-30AI39262ND
2014-04-30AI39263ND
2014-04-30AI39264ND
2014-07-31AI47705ND
2014-07-31AI47706ND
2014-07-31AI47707ND
2014-07-31AI47708ND
2014-08-27AI51584ND
2014-08-27AI51585ND
2014-08-27AI515861.70 ppb
2014-08-27AI51587ND
2014-08-27AI51588ND
2014-10-22AI58155ND
2014-10-22AI58156ND
2014-10-22AI58157ND
2014-10-22AI58158ND
2015-01-26AI63430ND
2015-01-26AI634312.40 ppb
2015-01-26AI634322.40 ppb
2015-01-26AI63433ND
2015-04-23AI755712.40 ppb
2015-04-23AI755723.20 ppb
2015-04-23AI755734.10 ppb
2015-04-23AI755742.70 ppb
2015-07-27AI842282.40 ppb
2015-07-27AI842292.50 ppb
2015-07-27AI84230ND
2015-07-27AI842312.70 ppb
2015-10-21AI996361.50 ppb
2015-10-21AI996372.30 ppb
2015-10-21AI996383.30 ppb
2015-10-21AI996391.70 ppb
2016-01-26AJ050141.70 ppb
2016-01-26AJ05015ND
2016-01-26AJ05016ND
2016-01-26AJ05017ND
2016-04-18AJ101792.80 ppb
2016-04-18AJ101802.90 ppb
2016-04-18AJ101811.10 ppb
2016-04-18AJ10182ND
2016-07-28159442-013.66 ppb
2016-07-28159442-023.36 ppb
2016-07-28159442-032.01 ppb
2016-07-28159442-04ND
2017-02-22165792-01A3.47 ppb
2017-02-22165792023.04 ppb
2017-02-22165792030.770 ppb
2017-02-22165792042.12 ppb
2017-05-16168157-013.27 ppb
2017-05-16168157-022.45 ppb
2017-05-16168157-032.77 ppb
2017-05-16168157-042.67 ppb
2017-08-16170793-011.68 ppb
2017-08-16170793-020.820 ppb
2017-08-16170793-032.99 ppb
2017-08-16170793-042.32 ppb
2017-08-17171067-010.330 ppb
2017-08-17171068-014.61 ppb
2017-08-17171069-01ND
2017-08-17171070-010.310 ppb
2017-08-17171071-011.06 ppb
2017-11-08173640-011.46 ppb
2017-11-08173640-022.44 ppb
2017-11-08173640-032.56 ppb
2017-11-08173640-04ND
2018-02-22176146-011.65 ppb
2018-02-22176146-022.93 ppb
2018-02-22176146-032.40 ppb
2018-02-22176146-041.89 ppb
2018-05-14178624-010.330 ppb
2018-05-14178624-020.250 ppb
2018-05-14178624-030.370 ppb
2018-05-14178624-042.16 ppb
2018-08-13181781-011.56 ppb
2018-08-13181781-023.02 ppb
2018-08-13181781-030.970 ppb
2018-08-13181781-042.29 ppb
2018-11-19184617-012.55 ppb
2018-11-19184617-021.74 ppb
2018-11-19184617-03ND
2018-11-19184617-041.63 ppb
2019-02-07187264-011.19 ppb
2019-02-07187264-021.76 ppb
2019-02-07187264-030.210 ppb
2019-02-07187264-041.60 ppb
2019-06-25190281-011.51 ppb
2019-06-25190281-022.25 ppb
2019-06-25190281-030.270 ppb
2019-06-25190281-042.64 ppb
2019-08-08193791-013.56 ppb
2019-08-28193791-022.80 ppb
2019-08-28193791-031.89 ppb
2019-08-28193791-043.61 ppb
2019-12-03197733-011.82 ppb
2019-12-03197733-021.80 ppb
2019-12-03197733-032.31 ppb
2019-12-03197733-041.36 ppb