Bromoform

Quonnipaug Hills - Main System

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.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	0.650 ppb	2	1	ND - 1.30 ppb
2015	0.543 ppb	3	2	ND - 1.000 ppb
2016	0.697 ppb	6	4	ND - 1.20 ppb
2017	1.04 ppb	5	4	ND - 1.90 ppb
2018	0.468 ppb	5	2	ND - 1.70 ppb
2019	0.765 ppb	6	4	ND - 1.50 ppb

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	Lab ID	Result
2014-01-21	BG01464VOC1	ND
2014-08-22	BG98408TTHM	1.30 ppb
2015-07-10	BJ44754VOC1	0.630 ppb
2015-08-10	BJ71581TTHM	1.000 ppb
2015-12-11	BK35925VOC1	ND
2016-01-07	BK49383VOC1	ND
2016-02-11	BK64593VOC1	1.000 ppb
2016-04-11	BN11225VOC1	1.000 ppb
2016-07-11	BN70336VOC1	0.980 ppb
2016-08-04	BN86146TTHM	1.20 ppb
2016-10-20	BV59931VOC1	ND
2017-01-13	BX22532VOC1	1.10 ppb
2017-04-13	BY03996VOC1	1.90 ppb
2017-07-17	BY61053VOC1	1.10 ppb
2017-08-17	BY86137TTHM	1.10 ppb
2017-10-06	BZ17191VOC1	ND
2018-01-12	BZ72130VOC1	0.640 ppb
2018-04-09	CA16218VOC1	ND
2018-08-10	CB09066	1.70 ppb
2018-08-10	CB09067	ND
2018-10-01	CB61937	ND
2019-02-19	CC53974	ND
2019-04-01	CC78540	1.20 ppb
2019-07-08	CD51641	ND
2019-08-05	CD73340	0.980 ppb
2019-10-08	CE28860	0.910 ppb
2019-10-08	CE28859	1.50 ppb