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EWG's Tap Water Database — 2019 UPDATE

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Dibromochloromethane

Holliston Water Department

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.

 

59

Samples

0

Samples exceeding legal limit (MCL)

48

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.660 ppb220.650 ppb - 0.670 ppb
20130.550 ppb110.550 ppb
20140.688 ppb96ND - 1.30 ppb
20155.27 ppb1916ND - 11.0 ppb
20165.61 ppb2219ND - 12.0 ppb
20170.687 ppb64ND - 2.09 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 Result
2012-04-230.670 ppb
2012-12-190.650 ppb
2013-05-220.550 ppb
2014-03-121.000 ppb
2014-06-12ND
2014-06-120.700 ppb
2014-06-16ND
2014-06-16ND
2014-06-161.20 ppb
2014-06-160.890 ppb
2014-09-091.30 ppb
2014-11-041.10 ppb
2015-03-108.10 ppb
2015-03-106.80 ppb
2015-03-105.00 ppb
2015-03-1011.0 ppb
2015-05-050.960 ppb
2015-05-05ND
2015-05-120.810 ppb
2015-05-19ND
2015-05-19ND
2015-05-190.820 ppb
2015-06-0911.0 ppb
2015-06-095.30 ppb
2015-06-097.80 ppb
2015-06-105.40 ppb
2015-09-086.10 ppb
2015-09-085.90 ppb
2015-09-088.70 ppb
2015-09-089.60 ppb
2015-12-106.80 ppb
2016-03-083.80 ppb
2016-03-0811.0 ppb
2016-03-085.00 ppb
2016-03-085.80 ppb
2016-05-031.80 ppb
2016-05-03ND
2016-05-030.610 ppb
2016-05-03ND
2016-05-240.780 ppb
2016-05-24ND
2016-06-149.70 ppb
2016-06-1411.0 ppb
2016-06-147.50 ppb
2016-06-146.80 ppb
2016-09-133.80 ppb
2016-09-137.10 ppb
2016-09-1312.0 ppb
2016-09-139.70 ppb
2016-12-133.70 ppb
2016-12-135.70 ppb
2016-12-1312.0 ppb
2016-12-135.70 ppb
2017-05-160.730 ppb
2017-05-162.09 ppb
2017-05-160.610 ppb
2017-05-16ND
2017-05-160.690 ppb
2017-05-16ND