EWG's Tap Water Database — 2021 UPDATE



Entranosa Water and Wastewater Co-op

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.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20150.750 ppb220.400 ppb - 1.10 ppb
20160.490 ppb220.290 ppb - 0.690 ppb
20170.605 ppb220.360 ppb - 0.850 ppb
20180.605 ppb220.210 ppb - 1.000 ppb
20190.295 ppb21ND - 0.590 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
2015-08-1220150232431.10 ppb
2015-08-1220150232420.400 ppb
2016-08-0520160225480.690 ppb
2016-08-0520160225490.290 ppb
2017-08-1520170235830.850 ppb
2017-08-1520170235820.360 ppb
2018-08-0920180222780.210 ppb
2018-08-0920180222791.000 ppb
2019-08-1920190231570.590 ppb