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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

City of Madison

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

 

90

Samples

0

Samples exceeding legal limit (MCL)

62

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.81 ppb1610ND - 7.78 ppb
20154.44 ppb1612ND - 14.2 ppb
20165.18 ppb1613ND - 12.2 ppb
20172.68 ppb147ND - 9.30 ppb
20182.90 ppb129ND - 7.15 ppb
20191.73 ppb1611ND - 5.21 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
2014-01-30140131-004THND
2014-01-30140131-003THND
2014-01-30140131-002TH1.47 ppb
2014-01-30140131-001TH1.11 ppb
2014-04-30140501-020TH4.25 ppb
2014-04-30140501-019TH1.63 ppb
2014-04-30140501-016TH1.74 ppb
2014-04-30140501-015THND
2014-07-30140731-014TH2.34 ppb
2014-07-30140731-013TH3.90 ppb
2014-07-30140731-022THND
2014-07-30140731-023TH1.54 ppb
2014-10-29141030-012THND
2014-10-29141030-011TH3.15 ppb
2014-10-29141030-010TH7.78 ppb
2014-10-29141030-009THND
2015-01-28150129-008TH7.63 ppb
2015-01-28150129-007TH7.15 ppb
2015-01-28150129-006TH7.81 ppb
2015-01-28150129-005THND
2015-04-29150430-019THND
2015-04-29150430-009THND
2015-04-29150430-010TH1.86 ppb
2015-04-29150430-020THND
2015-07-29150730-012TH1.86 ppb
2015-07-29150730-011TH11.9 ppb
2015-07-29150730-004TH9.02 ppb
2015-07-29150730-003TH14.2 ppb
2015-10-28151029-010TH1.04 ppb
2015-10-28151029-009TH3.55 ppb
2015-10-28151029-008TH3.16 ppb
2015-10-28151029-007TH1.79 ppb
2016-02-01160202-027THND
2016-02-01160202-023TH4.64 ppb
2016-02-01160202-024TH1.68 ppb
2016-02-01160202-028TH1.85 ppb
2016-04-20160421-004TH4.60 ppb
2016-04-20160421-003THND
2016-04-20160421-002TH5.75 ppb
2016-04-20160421-001TH6.34 ppb
2016-07-18160719-007TH6.54 ppb
2016-07-18160719-006THND
2016-07-18160719-005TH8.80 ppb
2016-07-18160719-004TH11.1 ppb
2016-10-24161025-004TH10.5 ppb
2016-10-24161025-003TH12.2 ppb
2016-10-24161025-002TH6.40 ppb
2016-10-24161025-001TH2.41 ppb
2017-04-17170418-006TH6.08 ppb
2017-04-17170418-005THND
2017-04-17170418-004THND
2017-04-17170418-003THND
2017-06-20170621-003THND
2017-07-17170718-002TH9.30 ppb
2017-07-17170718-001TH7.28 ppb
2017-07-17170718-005THND
2017-07-17170718-006TH6.48 ppb
2017-08-22170823-006THND
2017-10-25171026-016TH2.69 ppb
2017-10-25171026-015THND
2017-10-25171026-014TH3.01 ppb
2017-10-25171026-013TH2.70 ppb
2018-01-18180119-004TH2.04 ppb
2018-01-18180119-003TH1.61 ppb
2018-01-18180119-002TH6.87 ppb
2018-01-18180119-001THND
2018-07-23180724-003TH5.45 ppb
2018-07-23180724-001THND
2018-07-23180724-002TH7.15 ppb
2018-09-17180918-005TH1.45 ppb
2018-10-15181016-004TH2.71 ppb
2018-10-15181016-003TH2.74 ppb
2018-10-15181016-002TH4.81 ppb
2018-10-15181016-001THND
2019-02-06190207-001TH1.74 ppb
2019-02-06190207-011TH2.41 ppb
2019-02-06190207-012TH2.27 ppb
2019-02-06190207-017TH1.18 ppb
2019-04-25190426-015TH2.32 ppb
2019-04-25190426-014TH2.41 ppb
2019-04-25190426-013TH2.50 ppb
2019-04-25190426-012THND
2019-07-16190717-004TH5.21 ppb
2019-07-16190717-003TH3.30 ppb
2019-07-16190717-002TH3.11 ppb
2019-07-16190717-001THND
2019-11-19191121-012THND
2019-11-19191121-013THND
2019-11-19191121-014TH1.22 ppb
2019-11-19191121-011THND