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EWG's Tap Water Database — 2019 UPDATE

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Bromodichloromethane

Holliston Water Department

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.

 

60

Samples

0

Samples exceeding legal limit (MCL)

45

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.887 ppb330.510 ppb - 1.60 ppb
20132.70 ppb112.70 ppb
20140.719 ppb94ND - 4.90 ppb
20156.62 ppb1915ND - 17.0 ppb
20169.37 ppb2219ND - 22.0 ppb
20171.46 ppb63ND - 4.34 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 Result
2012-04-230.550 ppb
2012-05-161.60 ppb
2012-12-190.510 ppb
2013-05-222.70 ppb
2014-03-12ND
2014-06-12ND
2014-06-120.510 ppb
2014-06-16ND
2014-06-16ND
2014-06-160.530 ppb
2014-06-164.90 ppb
2014-09-090.530 ppb
2014-11-04ND
2015-03-106.50 ppb
2015-03-107.70 ppb
2015-03-103.30 ppb
2015-03-1011.0 ppb
2015-05-050.740 ppb
2015-05-05ND
2015-05-124.30 ppb
2015-05-19ND
2015-05-19ND
2015-05-19ND
2015-06-0913.0 ppb
2015-06-098.90 ppb
2015-06-0915.0 ppb
2015-06-104.80 ppb
2015-09-087.40 ppb
2015-09-085.20 ppb
2015-09-0817.0 ppb
2015-09-0816.0 ppb
2015-12-104.90 ppb
2016-03-0813.0 ppb
2016-03-0811.0 ppb
2016-03-087.30 ppb
2016-03-083.60 ppb
2016-05-031.20 ppb
2016-05-03ND
2016-05-033.60 ppb
2016-05-03ND
2016-05-240.820 ppb
2016-05-24ND
2016-06-1420.0 ppb
2016-06-1416.0 ppb
2016-06-149.20 ppb
2016-06-144.60 ppb
2016-09-1320.0 ppb
2016-09-135.80 ppb
2016-09-1322.0 ppb
2016-09-1311.0 ppb
2016-12-1316.0 ppb
2016-12-1311.0 ppb
2016-12-1317.0 ppb
2016-12-1313.0 ppb
2017-05-160.920 ppb
2017-05-163.49 ppb
2017-05-16ND
2017-05-16ND
2017-05-164.34 ppb
2017-05-16ND