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Dibromochloromethane

South Hero Fire District 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.

 

32

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2010ND70ND
2011ND50ND
2012ND50ND
2013ND50ND
2014ND50ND
2015ND50ND

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 0.1 ppb

The 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.

EPA Maximum Contaminant
Level Goal (MCLG)60.0 ppb

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppb = parts per billion.

All test results

Date Lab ID Result
2010-02-0410V234ND
2010-02-0410V235ND
2010-02-0410V236ND
2010-04-0610V267ND
2010-06-1810V296ND
2010-09-1411V052ND
2010-12-1411V098ND
2011-03-2711V206ND
2011-03-2811V207ND
2011-06-2611V254ND
2011-09-2312V081ND
2011-12-0512V116ND
2012-03-0712V170ND
2012-03-1312V174ND
2012-05-1412V207ND
2012-09-1713V00078ND
2012-12-1113V00127ND
2013-03-0613V00161ND
2013-03-0613V00160ND
2013-05-1413V00199ND
2013-08-1814V00033ND
2013-11-0714V00086ND
2014-02-0414V00116ND
2014-02-1114V00131ND
2014-05-2214V00193ND
2014-08-1915V00081ND
2014-11-0515V00132ND
2015-02-0415V00164ND
2015-03-2515V00185ND
2015-05-2615V00206ND
2015-08-0616V00028ND
2015-11-111511-24726-001ND