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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

Hyannis Water System

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

 

131

Samples

0

Samples exceeding legal limit (MCL)

74

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.230 ppb103ND - 0.900 ppb
20150.633 ppb2614ND - 2.10 ppb
20160.920 ppb2915ND - 3.20 ppb
20170.682 ppb2313ND - 2.20 ppb
20180.805 ppb2212ND - 3.90 ppb
20192.60 ppb2117ND - 8.30 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
2014-02-110.900 ppb
2014-04-08ND
2014-07-15ND
2014-07-15ND
2014-07-15ND
2014-07-15ND
2014-07-15ND
2014-07-150.800 ppb
2014-07-15ND
2014-10-150.600 ppb
2015-01-130.900 ppb
2015-02-100.800 ppb
2015-02-101.000 ppb
2015-02-100.800 ppb
2015-02-101.30 ppb
2015-04-210.800 ppb
2015-05-12ND
2015-05-121.60 ppb
2015-05-12ND
2015-05-121.90 ppb
2015-07-14ND
2015-07-14ND
2015-07-14ND
2015-07-14ND
2015-07-14ND
2015-07-141.000 ppb
2015-07-140.600 ppb
2015-08-11ND
2015-08-11ND
2015-08-11ND
2015-08-11ND
2015-11-030.870 ppb
2015-11-101.40 ppb
2015-11-101.40 ppb
2015-11-102.10 ppb
2015-11-10ND
2016-01-141.10 ppb
2016-02-092.90 ppb
2016-02-091.30 ppb
2016-02-093.20 ppb
2016-02-092.10 ppb
2016-04-130.820 ppb
2016-05-10ND
2016-05-101.60 ppb
2016-05-10ND
2016-05-10ND
2016-06-08ND
2016-06-29ND
2016-07-19ND
2016-07-19ND
2016-07-190.670 ppb
2016-07-19ND
2016-07-191.60 ppb
2016-07-191.60 ppb
2016-07-19ND
2016-07-19ND
2016-08-10ND
2016-08-10ND
2016-08-101.10 ppb
2016-08-102.20 ppb
2016-10-11ND
2016-11-232.30 ppb
2016-11-231.20 ppb
2016-11-233.00 ppb
2016-11-23ND
2017-01-19ND
2017-02-021.20 ppb
2017-02-021.10 ppb
2017-02-021.40 ppb
2017-02-02ND
2017-04-19ND
2017-04-19ND
2017-05-091.50 ppb
2017-05-09ND
2017-05-091.30 ppb
2017-05-09ND
2017-07-120.540 ppb
2017-07-12ND
2017-07-120.550 ppb
2017-08-08ND
2017-08-08ND
2017-08-082.20 ppb
2017-08-081.000 ppb
2017-10-18ND
2017-11-141.10 ppb
2017-11-141.60 ppb
2017-11-141.20 ppb
2017-11-141.000 ppb
2018-01-090.890 ppb
2018-02-131.60 ppb
2018-02-13ND
2018-02-13ND
2018-02-13ND
2018-05-030.870 ppb
2018-05-152.10 ppb
2018-05-152.00 ppb
2018-05-151.30 ppb
2018-05-15ND
2018-07-17ND
2018-07-17ND
2018-07-170.540 ppb
2018-08-07ND
2018-08-07ND
2018-08-073.90 ppb
2018-08-071.20 ppb
2018-10-230.500 ppb
2018-11-131.70 ppb
2018-11-131.10 ppb
2018-11-13ND
2018-11-13ND
2019-01-090.620 ppb
2019-02-061.60 ppb
2019-02-06ND
2019-02-061.60 ppb
2019-02-06ND
2019-04-110.730 ppb
2019-05-083.60 ppb
2019-05-080.680 ppb
2019-08-098.30 ppb
2019-08-091.20 ppb
2019-08-097.40 ppb
2019-08-091.60 ppb
2019-08-09ND
2019-08-095.10 ppb
2019-08-090.550 ppb
2019-10-087.40 ppb
2019-10-080.710 ppb
2019-11-077.00 ppb
2019-11-075.40 ppb
2019-11-071.10 ppb
2019-11-07ND