Bromoform

Athol DPW Water Division

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

130

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	ND	10	0	ND
2015	0.517 ppb	20	12	ND - 0.980 ppb
2016	1.04 ppb	26	16	ND - 3.30 ppb
2017	0.853 ppb	20	12	ND - 3.10 ppb
2018	0.483 ppb	28	12	ND - 1.50 ppb
2019	0.422 ppb	26	16	ND - 0.820 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
2014-02-04	ND
2014-02-04	ND
2014-02-04	ND
2014-02-04	ND
2014-06-03	ND
2014-06-03	ND
2014-08-05	ND
2014-08-05	ND
2014-10-21	ND
2014-10-21	ND
2015-02-17	0.900 ppb
2015-02-17	0.900 ppb
2015-02-17	0.640 ppb
2015-02-17	0.640 ppb
2015-04-20	ND
2015-04-20	ND
2015-04-21	ND
2015-04-21	ND
2015-05-19	0.900 ppb
2015-05-19	0.900 ppb
2015-05-19	0.980 ppb
2015-05-19	0.980 ppb
2015-07-21	ND
2015-07-21	ND
2015-10-20	ND
2015-10-20	ND
2015-11-17	0.920 ppb
2015-11-17	0.920 ppb
2015-11-17	0.830 ppb
2015-11-17	0.830 ppb
2016-02-16	1.000 ppb
2016-02-16	1.000 ppb
2016-02-16	ND
2016-02-16	ND
2016-02-16	ND
2016-02-16	ND
2016-02-17	0.980 ppb
2016-02-17	0.980 ppb
2016-05-17	1.40 ppb
2016-05-17	1.40 ppb
2016-05-17	1.80 ppb
2016-05-17	1.80 ppb
2016-05-17	ND
2016-05-17	ND
2016-08-16	2.50 ppb
2016-08-16	2.50 ppb
2016-08-16	3.30 ppb
2016-08-16	3.30 ppb
2016-08-16	ND
2016-08-16	ND
2016-10-18	ND
2016-10-18	ND
2016-11-15	1.20 ppb
2016-11-15	1.20 ppb
2016-11-15	1.30 ppb
2016-11-15	1.30 ppb
2017-01-03	ND
2017-01-03	ND
2017-02-21	1.10 ppb
2017-02-21	1.10 ppb
2017-02-21	0.830 ppb
2017-02-21	0.830 ppb
2017-02-21	ND
2017-02-21	ND
2017-05-16	0.720 ppb
2017-05-16	0.720 ppb
2017-05-16	0.880 ppb
2017-05-16	0.880 ppb
2017-05-16	ND
2017-05-16	ND
2017-10-16	ND
2017-10-16	ND
2017-11-21	1.90 ppb
2017-11-21	1.90 ppb
2017-11-21	3.10 ppb
2017-11-21	3.10 ppb
2018-02-20	1.30 ppb
2018-02-20	1.30 ppb
2018-02-20	1.10 ppb
2018-02-20	1.10 ppb
2018-02-20	ND
2018-02-20	ND
2018-03-05	ND
2018-03-05	ND
2018-05-15	1.10 ppb
2018-05-15	1.10 ppb
2018-05-15	1.50 ppb
2018-05-15	1.50 ppb
2018-05-15	ND
2018-05-15	ND
2018-05-15	ND
2018-05-15	ND
2018-07-17	ND
2018-07-17	ND
2018-08-21	ND
2018-08-21	ND
2018-08-21	1.20 ppb
2018-08-21	1.20 ppb
2018-10-23	ND
2018-10-23	ND
2018-11-19	ND
2018-11-19	ND
2018-11-19	0.560 ppb
2018-11-19	0.560 ppb
2019-02-05	ND
2019-02-05	ND
2019-02-05	ND
2019-02-05	ND
2019-02-19	0.820 ppb
2019-02-19	0.820 ppb
2019-02-19	0.740 ppb
2019-02-19	0.740 ppb
2019-05-07	ND
2019-05-07	ND
2019-05-21	0.600 ppb
2019-05-21	0.600 ppb
2019-05-21	0.520 ppb
2019-05-21	0.520 ppb
2019-07-16	ND
2019-07-16	ND
2019-08-20	0.820 ppb
2019-08-20	0.820 ppb
2019-08-20	0.710 ppb
2019-08-20	0.710 ppb
2019-11-19	0.650 ppb
2019-11-19	0.650 ppb
2019-11-19	0.630 ppb
2019-11-19	0.630 ppb
2019-11-19	ND
2019-11-19	ND