Bromoform

Granger - Hunter Improvement 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

215

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	0.715 ppb	43	17	ND - 9.30 ppb
2015	0.256 ppb	37	9	ND - 3.50 ppb
2016	0.273 ppb	37	10	ND - 1.93 ppb
2017	0.733 ppb	39	12	ND - 8.01 ppb
2018	0.714 ppb	26	9	ND - 3.14 ppb
2019	1.01 ppb	33	12	ND - 7.99 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
2014-02-19	0.946 ppb
2014-02-19	0.537 ppb
2014-02-19	0.948 ppb
2014-02-19	1.92 ppb
2014-02-19	1.07 ppb
2014-02-19	0.830 ppb
2014-02-19	ND
2014-02-19	0.980 ppb
2014-05-14	0.595 ppb
2014-05-14	0.504 ppb
2014-05-14	ND
2014-05-14	0.543 ppb
2014-05-14	ND
2014-05-14	ND
2014-05-14	0.510 ppb
2014-05-14	ND
2014-07-09	ND
2014-07-09	ND
2014-07-09	ND
2014-07-09	ND
2014-07-09	9.30 ppb
2014-07-09	ND
2014-07-09	ND
2014-07-09	9.30 ppb
2014-07-09	ND
2014-07-09	ND
2014-07-09	ND
2014-08-21	ND
2014-08-21	0.518 ppb
2014-08-21	ND
2014-08-21	ND
2014-08-21	ND
2014-08-21	ND
2014-08-21	ND
2014-08-21	ND
2014-11-20	ND
2014-11-20	ND
2014-11-20	0.710 ppb
2014-11-20	ND
2014-11-20	ND
2014-11-20	ND
2014-11-20	0.743 ppb
2014-11-20	0.772 ppb
2015-02-19	ND
2015-02-19	ND
2015-02-19	0.600 ppb
2015-02-19	ND
2015-02-19	ND
2015-02-19	ND
2015-02-19	0.700 ppb
2015-02-19	0.600 ppb
2015-05-14	ND
2015-05-14	ND
2015-05-14	ND
2015-05-14	ND
2015-05-14	ND
2015-05-14	0.933 ppb
2015-05-14	ND
2015-05-14	0.989 ppb
2015-07-30	ND
2015-07-30	3.50 ppb
2015-07-30	ND
2015-07-30	ND
2015-07-30	ND
2015-08-20	ND
2015-08-20	ND
2015-08-20	ND
2015-08-20	ND
2015-08-20	ND
2015-08-20	ND
2015-08-20	0.559 ppb
2015-08-20	ND
2015-11-12	0.900 ppb
2015-11-12	ND
2015-11-12	ND
2015-11-12	ND
2015-11-12	ND
2015-11-12	ND
2015-11-12	0.700 ppb
2015-11-12	ND
2016-02-18	ND
2016-02-18	ND
2016-02-18	0.500 ppb
2016-02-18	ND
2016-02-18	ND
2016-02-18	ND
2016-02-18	ND
2016-02-18	ND
2016-05-19	ND
2016-05-19	ND
2016-05-19	ND
2016-05-19	ND
2016-05-19	ND
2016-05-19	ND
2016-05-19	ND
2016-05-19	ND
2016-07-19	ND
2016-07-19	ND
2016-07-19	ND
2016-07-19	ND
2016-07-19	ND
2016-08-24	ND
2016-08-24	ND
2016-08-24	ND
2016-08-24	0.610 ppb
2016-08-24	0.520 ppb
2016-08-24	ND
2016-08-24	0.640 ppb
2016-08-24	ND
2016-11-16	1.93 ppb
2016-11-16	1.01 ppb
2016-11-16	1.75 ppb
2016-11-16	1.02 ppb
2016-11-16	ND
2016-11-16	ND
2016-11-16	1.28 ppb
2016-11-16	0.830 ppb
2017-01-11	ND
2017-02-16	1.64 ppb
2017-02-16	0.810 ppb
2017-02-16	ND
2017-02-16	1.10 ppb
2017-02-16	1.83 ppb
2017-02-16	0.890 ppb
2017-02-16	ND
2017-02-16	1.04 ppb
2017-05-17	6.83 ppb
2017-05-17	0.690 ppb
2017-05-17	3.89 ppb
2017-05-17	1.12 ppb
2017-05-17	ND
2017-05-17	ND
2017-05-17	ND
2017-05-17	ND
2017-06-21	ND
2017-06-21	ND
2017-06-21	ND
2017-06-21	ND
2017-06-21	ND
2017-06-28	ND
2017-08-17	ND
2017-08-17	ND
2017-08-17	ND
2017-08-17	ND
2017-08-17	ND
2017-08-17	ND
2017-08-17	ND
2017-08-17	ND
2017-11-09	ND
2017-11-09	ND
2017-11-09	ND
2017-11-09	8.01 ppb
2017-11-09	0.720 ppb
2017-11-09	ND
2017-11-09	ND
2017-11-09	ND
2018-02-26	ND
2018-05-16	ND
2018-05-16	1.08 ppb
2018-05-16	ND
2018-05-16	2.28 ppb
2018-05-16	ND
2018-05-16	1.93 ppb
2018-05-16	3.14 ppb
2018-05-16	ND
2018-07-30	ND
2018-08-16	ND
2018-08-16	ND
2018-08-16	ND
2018-08-16	ND
2018-08-16	ND
2018-08-16	ND
2018-08-16	ND
2018-08-16	ND
2018-11-15	1.50 ppb
2018-11-15	ND
2018-11-15	2.05 ppb
2018-11-15	2.14 ppb
2018-11-15	ND
2018-11-15	ND
2018-11-15	2.06 ppb
2018-11-15	2.38 ppb
2019-02-19	ND
2019-02-19	ND
2019-02-19	ND
2019-02-19	ND
2019-02-19	ND
2019-02-19	ND
2019-02-19	ND
2019-02-19	ND
2019-05-02	0.630 ppb
2019-05-02	ND
2019-05-02	1.21 ppb
2019-05-02	ND
2019-05-02	ND
2019-05-02	ND
2019-05-02	1.34 ppb
2019-05-02	1.21 ppb
2019-07-23	ND
2019-08-21	ND
2019-08-21	ND
2019-08-21	ND
2019-08-21	ND
2019-08-21	ND
2019-08-21	ND
2019-08-21	ND
2019-08-21	ND
2019-11-18	0.650 ppb
2019-11-18	0.790 ppb
2019-11-18	0.680 ppb
2019-11-18	6.14 ppb
2019-11-18	7.99 ppb
2019-11-18	5.58 ppb
2019-11-18	0.740 ppb
2019-11-18	6.21 ppb