Bromoform

Danvers 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.

MORE ABOUT THIS CONTAMINANT

270

Samples

Samples exceeding legal limit (MCL)

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	0.793 ppb	8	8	0.740 ppb - 0.850 ppb
2015	0.357 ppb	88	42	ND - 1.08 ppb
2016	0.201 ppb	38	12	ND - 0.830 ppb
2017	0.124 ppb	44	6	ND - 1.04 ppb
2018	0.208 ppb	52	8	ND - 1.79 ppb
2019	0.0620 ppb	40	2	ND - 1.24 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
2014-01-15	0.850 ppb
2014-01-15	0.850 ppb
2014-04-09	0.740 ppb
2014-04-09	0.740 ppb
2014-07-14	0.840 ppb
2014-07-14	0.840 ppb
2014-11-12	0.740 ppb
2014-11-12	0.740 ppb
2015-01-20	0.520 ppb
2015-01-20	0.520 ppb
2015-03-05	ND
2015-03-05	ND
2015-03-05	ND
2015-03-05	ND
2015-03-05	ND
2015-03-05	ND
2015-03-05	ND
2015-03-05	ND
2015-04-08	ND
2015-04-08	ND
2015-04-08	ND
2015-04-08	ND
2015-04-08	ND
2015-04-08	ND
2015-04-08	ND
2015-04-08	ND
2015-04-17	0.580 ppb
2015-04-17	0.580 ppb
2015-05-06	0.560 ppb
2015-05-06	0.560 ppb
2015-05-06	ND
2015-05-06	ND
2015-05-06	ND
2015-05-06	ND
2015-05-06	0.640 ppb
2015-05-06	0.640 ppb
2015-06-03	0.570 ppb
2015-06-03	0.570 ppb
2015-06-03	0.520 ppb
2015-06-03	0.520 ppb
2015-06-03	ND
2015-06-03	ND
2015-06-03	0.630 ppb
2015-06-03	0.630 ppb
2015-07-13	0.660 ppb
2015-07-13	0.660 ppb
2015-07-15	ND
2015-07-15	ND
2015-07-15	ND
2015-07-15	ND
2015-07-15	ND
2015-07-15	ND
2015-07-15	ND
2015-07-15	ND
2015-08-05	ND
2015-08-05	ND
2015-08-05	ND
2015-08-05	ND
2015-08-05	ND
2015-08-05	ND
2015-08-05	ND
2015-08-05	ND
2015-09-03	ND
2015-09-03	ND
2015-09-03	ND
2015-09-03	ND
2015-09-03	ND
2015-09-03	ND
2015-09-03	ND
2015-09-03	ND
2015-10-08	0.880 ppb
2015-10-08	0.880 ppb
2015-10-08	0.660 ppb
2015-10-08	0.660 ppb
2015-10-08	0.730 ppb
2015-10-08	0.730 ppb
2015-10-08	0.890 ppb
2015-10-08	0.890 ppb
2015-10-20	0.890 ppb
2015-10-20	0.890 ppb
2015-11-17	1.05 ppb
2015-11-17	1.05 ppb
2015-11-17	0.640 ppb
2015-11-17	0.640 ppb
2015-11-17	1.08 ppb
2015-11-17	1.08 ppb
2015-11-17	0.890 ppb
2015-11-17	0.890 ppb
2015-12-03	0.990 ppb
2015-12-03	0.990 ppb
2015-12-03	0.570 ppb
2015-12-03	0.570 ppb
2015-12-03	0.820 ppb
2015-12-03	0.820 ppb
2015-12-03	0.950 ppb
2015-12-03	0.950 ppb
2016-03-03	ND
2016-03-03	ND
2016-03-03	ND
2016-03-03	ND
2016-03-03	ND
2016-03-03	ND
2016-03-03	ND
2016-03-03	ND
2016-04-28	0.830 ppb
2016-04-28	0.830 ppb
2016-06-02	ND
2016-06-02	ND
2016-06-02	ND
2016-06-02	ND
2016-06-02	ND
2016-06-02	ND
2016-06-02	ND
2016-06-02	ND
2016-09-07	ND
2016-09-07	ND
2016-09-07	ND
2016-09-07	ND
2016-09-07	ND
2016-09-07	ND
2016-09-07	ND
2016-09-07	ND
2016-11-30	0.590 ppb
2016-11-30	0.590 ppb
2016-11-30	0.710 ppb
2016-11-30	0.710 ppb
2016-12-07	0.560 ppb
2016-12-07	0.560 ppb
2016-12-07	ND
2016-12-07	ND
2016-12-07	0.540 ppb
2016-12-07	0.540 ppb
2016-12-07	0.580 ppb
2016-12-07	0.580 ppb
2017-03-08	ND
2017-03-08	ND
2017-03-08	ND
2017-03-08	ND
2017-03-08	ND
2017-03-08	ND
2017-03-08	ND
2017-03-08	ND
2017-05-02	0.650 ppb
2017-05-02	0.650 ppb
2017-06-16	ND
2017-06-16	ND
2017-06-16	ND
2017-06-16	ND
2017-06-16	ND
2017-06-16	ND
2017-06-16	ND
2017-06-16	ND
2017-08-01	1.04 ppb
2017-08-01	1.04 ppb
2017-08-01	ND
2017-08-01	ND
2017-08-01	1.04 ppb
2017-08-01	1.04 ppb
2017-08-01	ND
2017-08-01	ND
2017-09-07	ND
2017-09-07	ND
2017-09-07	ND
2017-09-07	ND
2017-09-07	ND
2017-09-07	ND
2017-09-07	ND
2017-09-07	ND
2017-11-28	ND
2017-11-28	ND
2017-12-06	ND
2017-12-06	ND
2017-12-06	ND
2017-12-06	ND
2017-12-06	ND
2017-12-06	ND
2017-12-06	ND
2017-12-06	ND
2018-01-16	1.11 ppb
2018-01-16	1.11 ppb
2018-01-16	ND
2018-01-16	ND
2018-03-07	ND
2018-03-07	ND
2018-03-07	ND
2018-03-07	ND
2018-03-07	ND
2018-03-07	ND
2018-03-07	ND
2018-03-07	ND
2018-05-10	1.08 ppb
2018-05-10	1.08 ppb
2018-05-10	ND
2018-05-10	ND
2018-06-06	ND
2018-06-06	ND
2018-06-06	ND
2018-06-06	ND
2018-06-06	ND
2018-06-06	ND
2018-06-06	ND
2018-06-06	ND
2018-08-02	ND
2018-08-02	ND
2018-08-13	1.79 ppb
2018-08-13	1.79 ppb
2018-08-13	ND
2018-08-13	ND
2018-09-06	ND
2018-09-06	ND
2018-09-06	ND
2018-09-06	ND
2018-09-06	ND
2018-09-06	ND
2018-09-06	ND
2018-09-06	ND
2018-10-15	ND
2018-10-15	ND
2018-10-15	1.44 ppb
2018-10-15	1.44 ppb
2018-10-15	ND
2018-10-15	ND
2018-12-05	ND
2018-12-05	ND
2018-12-05	ND
2018-12-05	ND
2018-12-05	ND
2018-12-05	ND
2018-12-05	ND
2018-12-05	ND
2019-03-13	ND
2019-03-13	ND
2019-03-13	ND
2019-03-13	ND
2019-03-13	ND
2019-03-13	ND
2019-03-13	ND
2019-03-13	ND
2019-03-26	ND
2019-03-26	ND
2019-03-26	ND
2019-03-26	ND
2019-04-17	1.24 ppb
2019-04-17	1.24 ppb
2019-04-17	ND
2019-04-17	ND
2019-06-06	ND
2019-06-06	ND
2019-06-06	ND
2019-06-06	ND
2019-06-06	ND
2019-06-06	ND
2019-06-06	ND
2019-06-06	ND
2019-09-05	ND
2019-09-05	ND
2019-09-05	ND
2019-09-05	ND
2019-09-05	ND
2019-09-05	ND
2019-09-05	ND
2019-09-05	ND
2019-12-05	ND
2019-12-05	ND
2019-12-05	ND
2019-12-05	ND
2019-12-05	ND
2019-12-05	ND
2019-12-05	ND
2019-12-05	ND