Bromoform

Acton Water Supply District

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

366

Samples

Samples exceeding legal limit (MCL)

178

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	0.242 ppb	38	8	ND - 2.00 ppb
2015	0.905 ppb	64	34	ND - 5.06 ppb
2016	1.23 ppb	68	34	ND - 4.08 ppb
2017	1.13 ppb	66	38	ND - 11.2 ppb
2018	0.775 ppb	62	34	ND - 4.17 ppb
2019	0.628 ppb	68	32	ND - 3.67 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
2014-02-20	ND
2014-02-20	ND
2014-05-19	ND
2014-05-19	ND
2014-07-16	0.600 ppb
2014-07-16	0.600 ppb
2014-07-16	ND
2014-07-16	ND
2014-07-16	ND
2014-07-16	ND
2014-08-04	ND
2014-08-04	ND
2014-08-04	0.500 ppb
2014-08-04	0.500 ppb
2014-08-04	ND
2014-08-04	ND
2014-08-04	ND
2014-08-04	ND
2014-08-04	ND
2014-08-04	ND
2014-08-04	ND
2014-08-04	ND
2014-08-04	ND
2014-08-04	ND
2014-08-15	1.49 ppb
2014-08-15	1.49 ppb
2014-08-15	ND
2014-08-15	ND
2014-08-15	ND
2014-08-15	ND
2014-08-15	ND
2014-08-15	ND
2014-08-15	ND
2014-08-15	ND
2014-08-26	2.00 ppb
2014-08-26	2.00 ppb
2014-10-20	ND
2014-10-20	ND
2015-02-18	ND
2015-02-18	ND
2015-02-18	0.510 ppb
2015-02-18	0.510 ppb
2015-02-18	1.13 ppb
2015-02-18	1.13 ppb
2015-02-19	0.750 ppb
2015-02-19	0.750 ppb
2015-05-22	ND
2015-05-22	ND
2015-05-22	5.06 ppb
2015-05-22	5.06 ppb
2015-05-22	1.33 ppb
2015-05-22	1.33 ppb
2015-05-22	1.79 ppb
2015-05-22	1.79 ppb
2015-06-26	0.900 ppb
2015-06-26	0.900 ppb
2015-08-03	1.10 ppb
2015-08-03	1.10 ppb
2015-08-03	ND
2015-08-03	ND
2015-08-03	ND
2015-08-03	ND
2015-08-03	ND
2015-08-03	ND
2015-08-03	ND
2015-08-03	ND
2015-08-17	0.850 ppb
2015-08-17	0.850 ppb
2015-08-17	ND
2015-08-17	ND
2015-08-17	ND
2015-08-17	ND
2015-08-17	ND
2015-08-17	ND
2015-08-17	ND
2015-08-17	ND
2015-08-17	ND
2015-08-17	ND
2015-08-19	0.780 ppb
2015-08-19	0.780 ppb
2015-08-19	2.19 ppb
2015-08-19	2.19 ppb
2015-08-19	1.07 ppb
2015-08-19	1.07 ppb
2015-08-19	2.63 ppb
2015-08-19	2.63 ppb
2015-09-14	ND
2015-09-14	ND
2015-09-14	ND
2015-09-14	ND
2015-09-14	ND
2015-09-14	ND
2015-11-18	4.08 ppb
2015-11-18	4.08 ppb
2015-11-18	2.30 ppb
2015-11-18	2.30 ppb
2015-11-19	ND
2015-11-19	ND
2015-11-19	1.39 ppb
2015-11-19	1.39 ppb
2015-11-30	1.10 ppb
2015-11-30	1.10 ppb
2016-02-10	0.800 ppb
2016-02-10	0.800 ppb
2016-02-17	4.08 ppb
2016-02-17	4.08 ppb
2016-02-17	2.70 ppb
2016-02-17	2.70 ppb
2016-02-17	1.85 ppb
2016-02-17	1.85 ppb
2016-02-17	2.87 ppb
2016-02-17	2.87 ppb
2016-05-17	ND
2016-05-17	ND
2016-05-17	2.73 ppb
2016-05-17	2.73 ppb
2016-05-17	1.17 ppb
2016-05-17	1.17 ppb
2016-05-17	1.42 ppb
2016-05-17	1.42 ppb
2016-06-06	1.40 ppb
2016-06-06	1.40 ppb
2016-07-14	ND
2016-07-14	ND
2016-07-25	ND
2016-07-25	ND
2016-07-29	ND
2016-07-29	ND
2016-07-29	ND
2016-07-29	ND
2016-07-29	ND
2016-07-29	ND
2016-08-08	ND
2016-08-08	ND
2016-08-16	1.62 ppb
2016-08-16	1.62 ppb
2016-08-16	3.95 ppb
2016-08-16	3.95 ppb
2016-08-16	1.83 ppb
2016-08-16	1.83 ppb
2016-08-16	3.13 ppb
2016-08-16	3.13 ppb
2016-09-07	1.57 ppb
2016-09-07	1.57 ppb
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
2016-09-07	ND
2016-09-07	ND
2016-09-22	ND
2016-09-22	ND
2016-09-22	ND
2016-09-22	ND
2016-09-22	ND
2016-09-22	ND
2016-11-15	3.53 ppb
2016-11-15	3.53 ppb
2016-11-15	3.21 ppb
2016-11-15	3.21 ppb
2016-11-16	ND
2016-11-16	ND
2016-11-16	3.86 ppb
2016-11-16	3.86 ppb
2016-11-17	ND
2016-11-17	ND
2017-02-01	1.04 ppb
2017-02-01	1.04 ppb
2017-02-15	ND
2017-02-15	ND
2017-02-15	2.31 ppb
2017-02-15	2.31 ppb
2017-02-15	1.93 ppb
2017-02-15	1.93 ppb
2017-02-15	2.06 ppb
2017-02-15	2.06 ppb
2017-05-03	0.700 ppb
2017-05-03	0.700 ppb
2017-05-17	ND
2017-05-17	ND
2017-05-17	3.01 ppb
2017-05-17	3.01 ppb
2017-05-17	1.17 ppb
2017-05-17	1.17 ppb
2017-05-17	1.20 ppb
2017-05-17	1.20 ppb
2017-07-12	ND
2017-07-12	ND
2017-07-12	ND
2017-07-12	ND
2017-07-12	ND
2017-07-12	ND
2017-07-27	0.600 ppb
2017-07-27	0.600 ppb
2017-07-27	ND
2017-07-27	ND
2017-08-09	0.700 ppb
2017-08-09	0.700 ppb
2017-08-09	ND
2017-08-09	ND
2017-08-09	ND
2017-08-09	ND
2017-08-09	ND
2017-08-09	ND
2017-08-09	ND
2017-08-09	ND
2017-08-09	ND
2017-08-09	ND
2017-08-16	2.60 ppb
2017-08-16	2.60 ppb
2017-08-16	11.2 ppb
2017-08-16	11.2 ppb
2017-08-16	0.600 ppb
2017-08-16	0.600 ppb
2017-08-16	1.03 ppb
2017-08-16	1.03 ppb
2017-11-16	0.610 ppb
2017-11-16	0.610 ppb
2017-11-16	2.56 ppb
2017-11-16	2.56 ppb
2017-11-16	1.30 ppb
2017-11-16	1.30 ppb
2017-11-17	1.77 ppb
2017-11-17	1.77 ppb
2017-12-11	ND
2017-12-11	ND
2017-12-11	0.920 ppb
2017-12-11	0.920 ppb
2017-12-11	ND
2017-12-11	ND
2017-12-11	ND
2017-12-11	ND
2018-02-12	2.32 ppb
2018-02-12	2.32 ppb
2018-02-12	1.60 ppb
2018-02-12	1.60 ppb
2018-02-12	1.12 ppb
2018-02-12	1.12 ppb
2018-02-12	1.52 ppb
2018-02-12	1.52 ppb
2018-03-14	0.730 ppb
2018-03-14	0.730 ppb
2018-05-16	1.35 ppb
2018-05-16	1.35 ppb
2018-05-16	4.17 ppb
2018-05-16	4.17 ppb
2018-05-16	ND
2018-05-16	ND
2018-05-16	0.610 ppb
2018-05-16	0.610 ppb
2018-06-11	ND
2018-06-11	ND
2018-07-26	ND
2018-07-26	ND
2018-07-26	ND
2018-07-26	ND
2018-07-26	ND
2018-07-26	ND
2018-08-15	1.52 ppb
2018-08-15	1.52 ppb
2018-08-15	3.07 ppb
2018-08-15	3.07 ppb
2018-08-15	ND
2018-08-15	ND
2018-08-15	1.43 ppb
2018-08-15	1.43 ppb
2018-09-05	1.30 ppb
2018-09-05	1.30 ppb
2018-09-05	ND
2018-09-05	ND
2018-09-05	ND
2018-09-05	ND
2018-09-19	0.700 ppb
2018-09-19	0.700 ppb
2018-09-19	ND
2018-09-19	ND
2018-09-19	ND
2018-09-19	ND
2018-09-19	ND
2018-09-19	ND
2018-09-19	ND
2018-09-19	ND
2018-09-19	ND
2018-09-19	ND
2018-11-20	ND
2018-11-20	ND
2018-11-20	0.830 ppb
2018-11-20	0.830 ppb
2018-11-20	0.600 ppb
2018-11-20	0.600 ppb
2018-11-20	0.620 ppb
2018-11-20	0.620 ppb
2018-12-10	0.550 ppb
2018-12-10	0.550 ppb
2019-02-21	0.530 ppb
2019-02-21	0.530 ppb
2019-02-21	2.37 ppb
2019-02-21	2.37 ppb
2019-02-21	1.75 ppb
2019-02-21	1.75 ppb
2019-02-21	2.88 ppb
2019-02-21	2.88 ppb
2019-03-26	0.800 ppb
2019-03-26	0.800 ppb
2019-05-14	ND
2019-05-14	ND
2019-05-15	1.000 ppb
2019-05-15	1.000 ppb
2019-05-15	1.000 ppb
2019-05-15	1.000 ppb
2019-05-15	ND
2019-05-15	ND
2019-05-15	ND
2019-05-15	ND
2019-07-24	2.11 ppb
2019-07-24	2.11 ppb
2019-07-24	ND
2019-07-24	ND
2019-07-25	0.770 ppb
2019-07-25	0.770 ppb
2019-07-25	ND
2019-07-25	ND
2019-07-25	ND
2019-07-25	ND
2019-07-25	ND
2019-07-25	ND
2019-07-31	0.580 ppb
2019-07-31	0.580 ppb
2019-07-31	ND
2019-07-31	ND
2019-08-21	ND
2019-08-21	ND
2019-08-21	3.67 ppb
2019-08-21	3.67 ppb
2019-08-21	ND
2019-08-21	ND
2019-08-21	0.650 ppb
2019-08-21	0.650 ppb
2019-09-10	ND
2019-09-10	ND
2019-09-16	ND
2019-09-16	ND
2019-09-16	ND
2019-09-16	ND
2019-09-16	ND
2019-09-16	ND
2019-09-16	ND
2019-09-16	ND
2019-09-16	ND
2019-09-16	ND
2019-09-16	ND
2019-09-16	ND
2019-11-21	ND
2019-11-21	ND
2019-11-21	1.38 ppb
2019-11-21	1.38 ppb
2019-11-21	0.580 ppb
2019-11-21	0.580 ppb
2019-11-21	0.750 ppb
2019-11-21	0.750 ppb
2019-12-11	0.540 ppb
2019-12-11	0.540 ppb