Bromoform

Hanover 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

186

Samples

Samples exceeding legal limit (MCL)

168

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	1.23 ppb	6	4	ND - 2.60 ppb
2015	4.07 ppb	30	28	ND - 9.30 ppb
2016	8.31 ppb	38	36	ND - 18.6 ppb
2017	5.23 ppb	36	34	ND - 14.3 ppb
2018	3.61 ppb	38	36	ND - 8.80 ppb
2019	3.05 ppb	38	32	ND - 8.60 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
2014-03-11	1.10 ppb
2014-03-11	1.10 ppb
2014-03-11	2.60 ppb
2014-03-11	2.60 ppb
2014-04-15	ND
2014-04-15	ND
2015-02-10	1.40 ppb
2015-02-10	1.40 ppb
2015-02-10	3.30 ppb
2015-02-10	3.30 ppb
2015-03-03	7.00 ppb
2015-03-03	7.00 ppb
2015-03-03	9.30 ppb
2015-03-03	9.30 ppb
2015-03-03	5.60 ppb
2015-03-03	5.60 ppb
2015-03-03	0.600 ppb
2015-03-03	0.600 ppb
2015-04-24	ND
2015-04-24	ND
2015-06-05	6.60 ppb
2015-06-05	6.60 ppb
2015-06-05	4.90 ppb
2015-06-05	4.90 ppb
2015-06-05	1.80 ppb
2015-06-05	1.80 ppb
2015-06-05	0.500 ppb
2015-06-05	0.500 ppb
2015-09-10	6.20 ppb
2015-09-10	6.20 ppb
2015-09-10	8.40 ppb
2015-09-10	8.40 ppb
2015-09-10	4.20 ppb
2015-09-10	4.20 ppb
2015-09-10	1.30 ppb
2015-09-10	1.30 ppb
2016-03-01	13.3 ppb
2016-03-01	13.3 ppb
2016-03-01	8.80 ppb
2016-03-01	8.80 ppb
2016-03-01	4.70 ppb
2016-03-01	4.70 ppb
2016-03-01	3.10 ppb
2016-03-01	3.10 ppb
2016-03-22	3.40 ppb
2016-03-22	3.40 ppb
2016-03-22	18.6 ppb
2016-03-22	18.6 ppb
2016-04-12	ND
2016-04-12	ND
2016-06-07	8.80 ppb
2016-06-07	8.80 ppb
2016-06-07	2.80 ppb
2016-06-07	2.80 ppb
2016-06-07	4.30 ppb
2016-06-07	4.30 ppb
2016-06-07	3.50 ppb
2016-06-07	3.50 ppb
2016-09-07	14.5 ppb
2016-09-07	14.5 ppb
2016-09-07	9.60 ppb
2016-09-07	9.60 ppb
2016-09-07	13.5 ppb
2016-09-07	13.5 ppb
2016-09-07	5.70 ppb
2016-09-07	5.70 ppb
2016-12-09	13.2 ppb
2016-12-09	13.2 ppb
2016-12-09	13.4 ppb
2016-12-09	13.4 ppb
2016-12-09	12.5 ppb
2016-12-09	12.5 ppb
2016-12-09	4.20 ppb
2016-12-09	4.20 ppb
2017-01-17	1.000 ppb
2017-01-17	1.000 ppb
2017-03-07	10.2 ppb
2017-03-07	10.2 ppb
2017-03-07	1.90 ppb
2017-03-07	1.90 ppb
2017-03-07	9.80 ppb
2017-03-07	9.80 ppb
2017-03-07	3.50 ppb
2017-03-07	3.50 ppb
2017-06-07	4.80 ppb
2017-06-07	4.80 ppb
2017-06-07	1.90 ppb
2017-06-07	1.90 ppb
2017-06-07	4.50 ppb
2017-06-07	4.50 ppb
2017-06-07	3.20 ppb
2017-06-07	3.20 ppb
2017-06-28	ND
2017-06-28	ND
2017-09-06	14.3 ppb
2017-09-06	14.3 ppb
2017-09-06	9.20 ppb
2017-09-06	9.20 ppb
2017-09-06	4.00 ppb
2017-09-06	4.00 ppb
2017-09-06	11.5 ppb
2017-09-06	11.5 ppb
2017-12-06	5.00 ppb
2017-12-06	5.00 ppb
2017-12-06	3.90 ppb
2017-12-06	3.90 ppb
2017-12-06	3.10 ppb
2017-12-06	3.10 ppb
2017-12-06	2.40 ppb
2017-12-06	2.40 ppb
2018-03-07	1.30 ppb
2018-03-07	1.30 ppb
2018-03-07	8.80 ppb
2018-03-07	8.80 ppb
2018-03-07	4.10 ppb
2018-03-07	4.10 ppb
2018-03-07	1.90 ppb
2018-03-07	1.90 ppb
2018-03-07	1.80 ppb
2018-03-07	1.80 ppb
2018-03-07	4.10 ppb
2018-03-07	4.10 ppb
2018-06-06	1.40 ppb
2018-06-06	1.40 ppb
2018-06-06	2.20 ppb
2018-06-06	2.20 ppb
2018-06-06	1.40 ppb
2018-06-06	1.40 ppb
2018-06-07	ND
2018-06-07	ND
2018-06-07	2.80 ppb
2018-06-07	2.80 ppb
2018-09-06	7.40 ppb
2018-09-06	7.40 ppb
2018-09-06	7.20 ppb
2018-09-06	7.20 ppb
2018-09-06	8.00 ppb
2018-09-06	8.00 ppb
2018-09-06	7.50 ppb
2018-09-06	7.50 ppb
2018-12-04	3.30 ppb
2018-12-04	3.30 ppb
2018-12-04	3.60 ppb
2018-12-04	3.60 ppb
2018-12-04	1.000 ppb
2018-12-04	1.000 ppb
2018-12-04	0.800 ppb
2018-12-04	0.800 ppb
2019-02-19	0.600 ppb
2019-02-19	0.600 ppb
2019-02-19	6.00 ppb
2019-02-19	6.00 ppb
2019-03-05	4.80 ppb
2019-03-05	4.80 ppb
2019-03-05	3.70 ppb
2019-03-05	3.70 ppb
2019-03-05	1.40 ppb
2019-03-05	1.40 ppb
2019-03-05	4.10 ppb
2019-03-05	4.10 ppb
2019-05-14	ND
2019-05-14	ND
2019-06-04	7.00 ppb
2019-06-04	7.00 ppb
2019-06-04	1.10 ppb
2019-06-04	1.10 ppb
2019-06-04	ND
2019-06-04	ND
2019-06-04	0.600 ppb
2019-06-04	0.600 ppb
2019-09-12	8.30 ppb
2019-09-12	8.30 ppb
2019-09-12	2.10 ppb
2019-09-12	2.10 ppb
2019-09-12	1.000 ppb
2019-09-12	1.000 ppb
2019-09-12	3.80 ppb
2019-09-12	3.80 ppb
2019-12-10	4.10 ppb
2019-12-10	4.10 ppb
2019-12-10	0.800 ppb
2019-12-10	0.800 ppb
2019-12-10	ND
2019-12-10	ND
2019-12-10	8.60 ppb
2019-12-10	8.60 ppb