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EWG's Tap Water Database — 2019 UPDATE

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Dibromochloromethane

Clarksville Waterworks

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.

 

31

Samples

0

Samples exceeding legal limit (MCL)

22

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20125.12 ppb43ND - 11.1 ppb
20131.14 ppb64ND - 3.00 ppb
20141.67 ppb660.570 ppb - 2.60 ppb
20151.49 ppb86ND - 2.80 ppb
20161.63 ppb41ND - 6.50 ppb
20170.677 ppb32ND - 1.30 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
2012-01-0412006010901ND
2012-05-291215200620211.1 ppb
2012-07-03121870120033.71 ppb
2012-10-03122780169035.67 ppb
2013-02-05130380020010.690 ppb
2013-04-0113094014201ND
2013-05-0713128000902ND
2013-07-01131840101011.99 ppb
2013-10-01132770013013.00 ppb
2013-11-18133250063011.15 ppb
2014-02-26140580023010.640 ppb
2014-03-10140720074010.570 ppb
2014-05-05141280127021.50 ppb
2014-11-10143170043022.40 ppb
2014-11-10143170044022.60 ppb
2014-12-02143380029022.30 ppb
2015-03-10150700020021.30 ppb
2015-03-10150700021021.10 ppb
2015-05-2015141008902ND
2015-05-2015141008002ND
2015-08-05152180071031.74 ppb
2015-08-10152230001022.60 ppb
2015-08-10152230002022.80 ppb
2015-10-20152950050032.40 ppb
2016-01-0516008005301ND
2016-02-0116035000101ND
2016-05-0916133001402ND
2016-08-09162230052026.50 ppb
2017-01-04170050186010.730 ppb
2017-05-3017153000102ND
2017-07-19172010054021.30 ppb