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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

West Delta Water Supply Corporation

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.

 

17

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201414.4 ppb221.80 ppb - 27.0 ppb
20158.30 ppb31ND - 24.9 ppb
20168.47 ppb31ND - 25.4 ppb
20174.18 ppb32ND - 10.6 ppb
20183.60 ppb31ND - 10.8 ppb
20192.99 ppb31ND - 8.98 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
2014-09-24Q144765400327.0 ppb
2014-09-24Q14476540021.80 ppb
2015-09-22Q153714700324.9 ppb
2015-09-22Q1537147002ND
2015-10-15Q1540550002ND
2016-06-09Q162330300725.4 ppb
2016-06-09Q1623303006ND
2016-06-09Q1623303002ND
2017-08-22Q173750900710.6 ppb
2017-08-22Q17375090021.94 ppb
2017-08-22Q1737509004ND
2018-06-21Q182488100110.8 ppb
2018-06-21Q1824881006ND
2018-06-21Q1824881002ND
2019-08-26Q1959454002ND
2019-08-26Q19594540078.98 ppb
2019-08-26Q1959454006ND