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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

City of Patterson

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane 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

 

114

Samples

0

Samples exceeding legal limit (MCL)

34

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.405 ppb2112ND - 0.900 ppb
20150.667 ppb1814ND - 1.20 ppb
20160.120 ppb204ND - 0.700 ppb
2017ND180ND
2018ND170ND
20190.200 ppb204ND - 1.000 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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
2014-03-115867-018-0928ND
2014-03-195867-900-09500.500 ppb
2014-03-195867-901-07550.600 ppb
2014-03-195867-902-10040.600 ppb
2014-03-195867-903-10150.600 ppb
2014-05-135867-012-0900ND
2014-06-105867-018-0930ND
2014-06-175867-900-07270.600 ppb
2014-06-175867-901-07120.700 ppb
2014-06-175867-902-07500.700 ppb
2014-06-175867-903-08180.700 ppb
2014-07-155867-900-0749ND
2014-07-155867-901-0732ND
2014-07-155867-902-0804ND
2014-07-155867-903-0813ND
2014-09-095867-018-1005ND
2014-10-075867-900-08390.800 ppb
2014-10-075867-901-07500.900 ppb
2014-10-075867-902-10010.900 ppb
2014-10-075867-903-10120.900 ppb
2014-12-095867-018-1146ND
2015-01-205867-900-09111.10 ppb
2015-01-205867-901-08001.20 ppb
2015-01-205867-902-08421.20 ppb
2015-01-205867-903-08161.20 ppb
2015-03-125867-018-1224ND
2015-04-145867-900-0819ND
2015-04-145867-901-09100.700 ppb
2015-04-145867-902-08330.600 ppb
2015-04-145867-903-08540.600 ppb
2015-07-145867-900-0839ND
2015-07-145867-901-08330.900 ppb
2015-07-145867-902-08200.900 ppb
2015-07-145867-903-08090.900 ppb
2015-10-135867-014-0847ND
2015-10-135867-900-09120.500 ppb
2015-10-135867-901-08090.600 ppb
2015-10-135867-902-09270.800 ppb
2015-10-135867-903-09380.800 ppb
2016-01-125867-900-0936ND
2016-01-125867-901-0948ND
2016-01-125867-902-0921ND
2016-01-125867-903-1000ND
2016-02-025867-016-0835ND
2016-04-185867-900-08100.700 ppb
2016-04-185867-901-07530.500 ppb
2016-04-185867-902-08250.500 ppb
2016-04-185867-903-08400.700 ppb
2016-07-125867-900-0818ND
2016-07-125867-901-0854ND
2016-07-125867-902-0904ND
2016-07-125867-903-0914ND
2016-08-165867-002-1011ND
2016-08-165867-005-0909ND
2016-08-165867-009-0952ND
2016-10-185867-901-1053ND
2016-10-185867-902-1030ND
2016-10-185867-903-1043ND
2016-10-195867-900-1126ND
2017-01-105867-900-0921ND
2017-01-105867-901-0939ND
2017-01-105867-902-1002ND
2017-01-105867-903-1012ND
2017-04-115867-900-0714ND
2017-04-115867-901-0754ND
2017-04-115867-902-0818ND
2017-04-115867-903-0807ND
2017-05-025867-012-0957ND
2017-06-065867-018-0950ND
2017-07-115867-900-0830ND
2017-07-115867-901-0715ND
2017-07-115867-902-0736ND
2017-07-115867-903-0900ND
2017-10-035867-900-0807ND
2017-10-035867-901-0821ND
2017-10-035867-902-0754ND
2017-10-035867-903-0926ND
2018-01-095867-900-1120ND
2018-01-095867-901-1132ND
2018-01-095867-902-1103ND
2018-01-095867-903-1048ND
2018-04-035867-900-0822ND
2018-04-035867-901-0752ND
2018-04-035867-902-0838ND
2018-04-035867-903-0850ND
2018-07-035867-900-0815ND
2018-07-035867-901-0730ND
2018-07-035867-902-0800ND
2018-07-035867-903-0745ND
2018-10-025867-014-1130ND
2018-10-025867-900-1000ND
2018-10-025867-901-0943ND
2018-10-025867-902-0838ND
2018-10-025867-903-0810ND
2019-01-085867-900-0945ND
2019-01-085867-901-1000ND
2019-01-085867-902-1015ND
2019-01-085867-903-1030ND
2019-02-055867-016-0945ND
2019-04-025867-900-0950ND
2019-04-025867-901-0753ND
2019-04-025867-902-1010ND
2019-04-025867-903-1025ND
2019-07-025867-900-0810ND
2019-07-025867-901-0825ND
2019-07-025867-902-0850ND
2019-07-025867-903-0905ND
2019-08-065867-002-0725ND
2019-08-065867-005-0830ND
2019-08-065867-009-0800ND
2019-10-015867-900-09001.000 ppb
2019-10-015867-901-08301.000 ppb
2019-10-015867-902-09251.000 ppb
2019-10-015867-903-09501.000 ppb