Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Dibromochloromethane

Point Roberts Water District No 4

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

 

40

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND80ND
2015ND80ND
2016ND80ND
2017ND80ND
2018ND40ND
2019ND40ND

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
2014-01-0200442ND
2014-01-0200443ND
2014-05-0612376ND
2014-05-0612377ND
2014-07-0219402ND
2014-07-0219401ND
2014-10-2074421ND
2014-10-2074422ND
2015-01-1474709ND
2015-01-1474708ND
2015-05-0416944ND
2015-05-0416945ND
2015-07-0926465ND
2015-07-0926464ND
2015-10-1439345ND
2015-10-1439344ND
2016-01-26ND
2016-01-26ND
2016-05-09ND
2016-05-09ND
2016-07-12ND
2016-07-12ND
2016-10-07ND
2016-10-07ND
2017-01-25ND
2017-01-25ND
2017-04-12ND
2017-04-12ND
2017-07-27ND
2017-07-27ND
2017-10-05ND
2017-10-05ND
2018-01-23ND
2018-04-11ND
2018-07-09ND
2018-10-10ND
2019-01-16ND
2019-04-22ND
2019-08-08ND
2019-10-17ND