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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

City of Hillsboro

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

 

80

Samples

0

Samples exceeding legal limit (MCL)

62

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.82 ppb16161.20 ppb - 2.40 ppb
20150.725 ppb168ND - 2.50 ppb
20161.09 ppb1612ND - 1.90 ppb
20171.28 ppb1614ND - 2.00 ppb
20181.02 ppb86ND - 1.86 ppb
20191.02 ppb86ND - 1.54 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
2014-02-20AC440191.50 ppb
2014-02-20AC440231.50 ppb
2014-02-20AC440251.50 ppb
2014-02-20AC440241.50 ppb
2014-04-23AC515931.70 ppb
2014-04-23AC515881.90 ppb
2014-04-23AC515851.90 ppb
2014-04-23AC515862.10 ppb
2014-08-18AC641301.50 ppb
2014-08-18AC641311.70 ppb
2014-08-18AC641321.80 ppb
2014-08-18AC641341.20 ppb
2014-12-10AC743012.30 ppb
2014-12-10AC743062.30 ppb
2014-12-10AC743072.30 ppb
2014-12-10AC743082.40 ppb
2015-03-04AC826581.50 ppb
2015-03-04AC827052.50 ppb
2015-03-04AC826591.50 ppb
2015-03-04AC826601.40 ppb
2015-06-11AC95761ND
2015-06-11AC95757ND
2015-06-11AC95771ND
2015-06-11AC95762ND
2015-09-02AD053501.10 ppb
2015-09-02AD053131.20 ppb
2015-09-02AD053201.20 ppb
2015-09-02AD053211.20 ppb
2015-11-10AD13344ND
2015-11-10AD13341ND
2015-11-10AD13339ND
2015-11-10AD13340ND
2016-02-02AD21422ND
2016-02-02AD21424ND
2016-02-02AD21450ND
2016-02-02AD21419ND
2016-04-19AD334241.70 ppb
2016-04-19AD334201.20 ppb
2016-04-19AD334231.20 ppb
2016-04-19AD334211.10 ppb
2016-07-20AD449131.40 ppb
2016-07-20AD449111.30 ppb
2016-07-20AD449141.40 ppb
2016-07-20AD449101.30 ppb
2016-11-02AD563131.50 ppb
2016-11-02AD563151.50 ppb
2016-11-02AD563141.90 ppb
2016-11-02AD563121.90 ppb
2017-01-26AD670851.40 ppb
2017-01-26AD671162.00 ppb
2017-01-26AD670881.60 ppb
2017-01-26AD670861.60 ppb
2017-04-19Q17161240041.62 ppb
2017-04-19Q17161240031.70 ppb
2017-04-19Q17161240021.50 ppb
2017-04-19Q17161240011.83 ppb
2017-07-17Q17291850011.20 ppb
2017-07-17Q1729185002ND
2017-07-17Q1729185004ND
2017-07-17Q17291850031.02 ppb
2017-10-05Q17491640061.18 ppb
2017-10-05Q17491640051.29 ppb
2017-10-05Q17491640091.21 ppb
2017-10-05Q17491640041.26 ppb
2018-01-09Q18008070071.11 ppb
2018-01-09Q18008070061.14 ppb
2018-04-11Q18150140031.17 ppb
2018-04-11Q18150140071.16 ppb
2018-07-11Q18272610071.86 ppb
2018-07-11Q18272610061.70 ppb
2018-10-23Q1842308006ND
2018-10-23Q1842308005ND
2019-01-15Q1902309007ND
2019-01-15Q1902309006ND
2019-04-04Q19137650041.18 ppb
2019-04-04Q19137650071.14 ppb
2019-07-10Q19434880071.51 ppb
2019-07-10Q19434880061.54 ppb
2019-10-03Q19710190031.48 ppb
2019-10-03Q19710190041.31 ppb