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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

St. Charles

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

 

100

Samples

0

Samples exceeding legal limit (MCL)

76

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.51 ppb1716ND - 2.47 ppb
20151.49 ppb1615ND - 2.26 ppb
20160.906 ppb1612ND - 1.82 ppb
20170.731 ppb1710ND - 1.68 ppb
20180.656 ppb1712ND - 1.60 ppb
20190.776 ppb1711ND - 1.70 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
2014-02-24AC182302.47 ppb
2014-02-24AC182311.69 ppb
2014-02-24AC182322.27 ppb
2014-02-24AC182332.18 ppb
2014-05-28AC232411.65 ppb
2014-05-28AC232401.81 ppb
2014-05-28AC232391.21 ppb
2014-05-28AC232381.83 ppb
2014-08-25AC33747ND
2014-09-15AC334621.19 ppb
2014-09-15AC334610.800 ppb
2014-09-15AC334601.58 ppb
2014-09-15AC334632.08 ppb
2014-11-25AC382861.30 ppb
2014-11-25AC382870.780 ppb
2014-11-25AC382881.44 ppb
2014-11-25AC382891.40 ppb
2015-02-24AC420141.40 ppb
2015-02-24AC420161.99 ppb
2015-02-24AC420132.14 ppb
2015-02-24AC420152.05 ppb
2015-05-27AC465751.44 ppb
2015-05-27AC465760.650 ppb
2015-05-27AC465771.32 ppb
2015-05-27AC465781.78 ppb
2015-09-02AC575572.26 ppb
2015-09-02AC57558ND
2015-09-02AC575601.37 ppb
2015-09-02AC575592.09 ppb
2015-11-30AC628420.640 ppb
2015-11-30AC628431.17 ppb
2015-11-30AC628411.97 ppb
2015-11-30AC628441.58 ppb
2016-03-02AC663901.17 ppb
2016-03-02AC66388ND
2016-03-02AC663891.18 ppb
2016-03-02AC663871.30 ppb
2016-06-07AC720841.37 ppb
2016-06-07AC720820.540 ppb
2016-06-07AC720831.64 ppb
2016-06-07AC720811.66 ppb
2016-08-25AC817270.620 ppb
2016-08-25AC817261.82 ppb
2016-08-25AC817281.63 ppb
2016-08-25AC81729ND
2016-11-07AC86981ND
2016-11-07AC86983ND
2016-11-07AC869820.780 ppb
2016-11-07AC869800.780 ppb
2017-02-24AC90830ND
2017-02-24AC90832ND
2017-02-24AC90833ND
2017-02-24AC90831ND
2017-04-28AC95136ND
2017-05-25AC958080.960 ppb
2017-05-25AC958101.49 ppb
2017-05-25AC958091.64 ppb
2017-05-25AC958071.68 ppb
2017-09-07AD035610.610 ppb
2017-09-07AD03563ND
2017-09-07AD035601.68 ppb
2017-09-07AD035621.57 ppb
2017-11-27AD095221.01 ppb
2017-11-27AD09521ND
2017-11-27AD095200.910 ppb
2017-11-27AD095230.870 ppb
2018-03-05AD14307ND
2018-03-05AD143081.60 ppb
2018-03-05AD143061.30 ppb
2018-03-05AD14309ND
2018-05-09AD18737ND
2018-06-04AD205400.600 ppb
2018-06-04AD205391.18 ppb
2018-06-04AD20538ND
2018-06-04AD205371.04 ppb
2018-08-28AD313491.07 ppb
2018-08-28AD313500.630 ppb
2018-08-28AD313511.09 ppb
2018-08-28AD31352ND
2018-12-04AD357470.670 ppb
2018-12-04AD357480.780 ppb
2018-12-04AD357490.610 ppb
2018-12-04AD357500.590 ppb
2019-02-25AD394161.05 ppb
2019-02-25AD394181.31 ppb
2019-02-25AD394151.41 ppb
2019-02-25AD394171.16 ppb
2019-04-24AD46837ND
2019-05-21AD474931.20 ppb
2019-05-21AD47494ND
2019-05-21AD474951.06 ppb
2019-05-21AD47496ND
2019-09-05AD540840.960 ppb
2019-09-05AD54085ND
2019-09-05AD540861.12 ppb
2019-09-05AD54087ND
2019-12-18AD581291.56 ppb
2019-12-18AD58130ND
2019-12-18AD581311.70 ppb
2019-12-18AD581320.660 ppb