Bromoform

Billerica Water Works

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

170

Samples

Samples exceeding legal limit (MCL)

138

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	N/A	0	0	N/A
2014	ND	2	0	ND
2015	2.18 ppb	32	30	ND - 9.00 ppb
2016	1.04 ppb	24	24	0.0520 ppb - 1.70 ppb
2017	1.61 ppb	40	38	ND - 4.10 ppb
2018	1.49 ppb	40	22	ND - 6.70 ppb
2019	0.884 ppb	32	26	ND - 2.30 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	Result
2014-12-13	ND
2014-12-13	ND
2015-02-17	1.60 ppb
2015-02-17	1.60 ppb
2015-02-17	1.20 ppb
2015-02-17	1.20 ppb
2015-02-17	1.70 ppb
2015-02-17	1.70 ppb
2015-02-17	ND
2015-02-17	ND
2015-02-17	1.30 ppb
2015-02-17	1.30 ppb
2015-05-20	3.00 ppb
2015-05-20	3.00 ppb
2015-05-20	2.90 ppb
2015-05-20	2.90 ppb
2015-05-20	2.40 ppb
2015-05-20	2.40 ppb
2015-05-20	1.80 ppb
2015-05-20	1.80 ppb
2015-05-20	2.80 ppb
2015-05-20	2.80 ppb
2015-08-19	9.00 ppb
2015-08-19	9.00 ppb
2015-11-18	1.50 ppb
2015-11-18	1.50 ppb
2015-11-18	1.40 ppb
2015-11-18	1.40 ppb
2015-11-18	1.50 ppb
2015-11-18	1.50 ppb
2015-11-18	1.10 ppb
2015-11-18	1.10 ppb
2015-11-18	1.60 ppb
2015-11-18	1.60 ppb
2016-02-17	0.0520 ppb
2016-02-17	0.0520 ppb
2016-05-18	0.680 ppb
2016-05-18	0.680 ppb
2016-08-04	1.50 ppb
2016-08-04	1.50 ppb
2016-08-17	1.10 ppb
2016-08-17	1.10 ppb
2016-08-17	0.700 ppb
2016-08-17	0.700 ppb
2016-08-17	0.800 ppb
2016-08-17	0.800 ppb
2016-08-17	1.000 ppb
2016-08-17	1.000 ppb
2016-11-16	1.70 ppb
2016-11-16	1.70 ppb
2016-11-16	1.20 ppb
2016-11-16	1.20 ppb
2016-11-16	1.20 ppb
2016-11-16	1.20 ppb
2016-11-16	1.30 ppb
2016-11-16	1.30 ppb
2016-11-16	1.20 ppb
2016-11-16	1.20 ppb
2017-02-15	1.70 ppb
2017-02-15	1.70 ppb
2017-02-15	1.60 ppb
2017-02-15	1.60 ppb
2017-02-15	1.40 ppb
2017-02-15	1.40 ppb
2017-02-15	ND
2017-02-15	ND
2017-02-15	1.60 ppb
2017-02-15	1.60 ppb
2017-05-16	0.770 ppb
2017-05-16	0.770 ppb
2017-05-16	0.640 ppb
2017-05-16	0.640 ppb
2017-05-16	0.640 ppb
2017-05-16	0.640 ppb
2017-05-16	0.920 ppb
2017-05-16	0.920 ppb
2017-05-16	0.680 ppb
2017-05-16	0.680 ppb
2017-08-16	1.30 ppb
2017-08-16	1.30 ppb
2017-08-16	1.30 ppb
2017-08-16	1.30 ppb
2017-08-16	1.20 ppb
2017-08-16	1.20 ppb
2017-08-16	1.20 ppb
2017-08-16	1.20 ppb
2017-08-16	1.30 ppb
2017-08-16	1.30 ppb
2017-11-16	4.10 ppb
2017-11-16	4.10 ppb
2017-11-16	2.20 ppb
2017-11-16	2.20 ppb
2017-11-16	3.40 ppb
2017-11-16	3.40 ppb
2017-11-16	2.60 ppb
2017-11-16	2.60 ppb
2017-11-16	3.70 ppb
2017-11-16	3.70 ppb
2018-02-13	0.900 ppb
2018-02-13	0.900 ppb
2018-02-14	1.80 ppb
2018-02-14	1.80 ppb
2018-02-14	2.10 ppb
2018-02-14	2.10 ppb
2018-02-14	1.70 ppb
2018-02-14	1.70 ppb
2018-02-14	2.20 ppb
2018-02-14	2.20 ppb
2018-05-16	ND
2018-05-16	ND
2018-05-17	ND
2018-05-17	ND
2018-05-17	ND
2018-05-17	ND
2018-05-17	0.540 ppb
2018-05-17	0.540 ppb
2018-05-17	ND
2018-05-17	ND
2018-08-15	2.00 ppb
2018-08-15	2.00 ppb
2018-08-15	6.70 ppb
2018-08-15	6.70 ppb
2018-08-15	4.20 ppb
2018-08-15	4.20 ppb
2018-08-15	1.90 ppb
2018-08-15	1.90 ppb
2018-08-15	5.70 ppb
2018-08-15	5.70 ppb
2018-11-15	ND
2018-11-15	ND
2018-11-15	ND
2018-11-15	ND
2018-11-15	ND
2018-11-15	ND
2018-11-15	ND
2018-11-15	ND
2018-11-15	ND
2018-11-15	ND
2019-02-14	0.560 ppb
2019-02-14	0.560 ppb
2019-02-14	0.830 ppb
2019-02-14	0.830 ppb
2019-02-14	0.830 ppb
2019-02-14	0.830 ppb
2019-02-14	ND
2019-02-14	ND
2019-02-14	0.890 ppb
2019-02-14	0.890 ppb
2019-05-16	0.780 ppb
2019-05-16	0.780 ppb
2019-05-16	0.590 ppb
2019-05-16	0.590 ppb
2019-05-16	ND
2019-05-16	ND
2019-05-16	0.700 ppb
2019-05-16	0.700 ppb
2019-05-16	0.760 ppb
2019-05-16	0.760 ppb
2019-08-15	2.30 ppb
2019-08-15	2.30 ppb
2019-08-15	2.30 ppb
2019-08-15	2.30 ppb
2019-08-15	1.40 ppb
2019-08-15	1.40 ppb
2019-08-15	ND
2019-08-15	ND
2019-08-15	1.40 ppb
2019-08-15	1.40 ppb
2019-12-09	0.800 ppb
2019-12-09	0.800 ppb