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EWG's Tap Water Database — 2019 UPDATE

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Bromoform

Holliston Water Department

Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

 

112

Samples

0

Samples exceeding legal limit (MCL)

52

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
2014ND180ND
20151.10 ppb3826ND - 2.60 ppb
20161.04 ppb4426ND - 3.00 ppb
2017ND120ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for bromoform 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
2014-03-12ND
2014-03-12ND
2014-06-12ND
2014-06-12ND
2014-06-12ND
2014-06-12ND
2014-06-16ND
2014-06-16ND
2014-06-16ND
2014-06-16ND
2014-06-16ND
2014-06-16ND
2014-06-16ND
2014-06-16ND
2014-09-09ND
2014-09-09ND
2014-11-04ND
2014-11-04ND
2015-03-101.40 ppb
2015-03-101.40 ppb
2015-03-101.40 ppb
2015-03-101.40 ppb
2015-03-102.60 ppb
2015-03-102.60 ppb
2015-03-102.00 ppb
2015-03-102.00 ppb
2015-05-05ND
2015-05-05ND
2015-05-05ND
2015-05-05ND
2015-05-12ND
2015-05-12ND
2015-05-19ND
2015-05-19ND
2015-05-19ND
2015-05-19ND
2015-05-19ND
2015-05-19ND
2015-06-090.880 ppb
2015-06-090.880 ppb
2015-06-092.20 ppb
2015-06-092.20 ppb
2015-06-091.70 ppb
2015-06-091.70 ppb
2015-06-101.40 ppb
2015-06-101.40 ppb
2015-09-081.10 ppb
2015-09-081.10 ppb
2015-09-081.30 ppb
2015-09-081.30 ppb
2015-09-081.50 ppb
2015-09-081.50 ppb
2015-09-081.30 ppb
2015-09-081.30 ppb
2015-12-102.10 ppb
2015-12-102.10 ppb
2016-03-082.00 ppb
2016-03-082.00 ppb
2016-03-080.660 ppb
2016-03-080.660 ppb
2016-03-083.00 ppb
2016-03-083.00 ppb
2016-03-08ND
2016-03-08ND
2016-05-03ND
2016-05-03ND
2016-05-030.560 ppb
2016-05-030.560 ppb
2016-05-03ND
2016-05-03ND
2016-05-03ND
2016-05-03ND
2016-05-24ND
2016-05-24ND
2016-05-24ND
2016-05-24ND
2016-06-142.30 ppb
2016-06-142.30 ppb
2016-06-141.40 ppb
2016-06-141.40 ppb
2016-06-141.60 ppb
2016-06-141.60 ppb
2016-06-142.00 ppb
2016-06-142.00 ppb
2016-09-131.80 ppb
2016-09-131.80 ppb
2016-09-132.40 ppb
2016-09-132.40 ppb
2016-09-132.30 ppb
2016-09-132.30 ppb
2016-09-13ND
2016-09-13ND
2016-12-13ND
2016-12-13ND
2016-12-130.580 ppb
2016-12-130.580 ppb
2016-12-132.30 ppb
2016-12-132.30 ppb
2016-12-13ND
2016-12-13ND
2017-05-16ND
2017-05-16ND
2017-05-16ND
2017-05-16ND
2017-05-16ND
2017-05-16ND
2017-05-16ND
2017-05-16ND
2017-05-16ND
2017-05-16ND
2017-05-16ND
2017-05-16ND