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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

City of Bozeman

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane 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

 

66

Samples

0

Samples exceeding legal limit (MCL)

64

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.00 ppb1817ND - 1.60 ppb
20151.09 ppb11110.510 ppb - 1.60 ppb
20161.23 ppb990.620 ppb - 2.00 ppb
20171.44 ppb109ND - 2.80 ppb
20181.32 ppb990.780 ppb - 1.90 ppb
20191.17 ppb990.610 ppb - 1.50 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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 Lab ID Result
2014-01-15B14011094-004A1.50 ppb
2014-01-15B14011094-003A1.000 ppb
2014-01-15B14011094-002A0.730 ppb
2014-01-15B14011094-001A1.10 ppb
2014-04-08B14040837-001A1.20 ppb
2014-04-08B14040837-002A0.900 ppb
2014-04-08B14040837-003A0.890 ppb
2014-04-08B14040837-004A1.50 ppb
2014-07-15B14071475-004A1.40 ppb
2014-07-15B14071475-003A1.20 ppb
2014-07-15B14071475-002A0.500 ppb
2014-07-15B14071475-001A1.20 ppb
2014-07-16B14071638-002FND
2014-07-16B14071638-001E0.620 ppb
2014-10-07B14100743-003A0.900 ppb
2014-10-07B14100743-001A1.20 ppb
2014-10-07B14100743-002A0.630 ppb
2014-10-07B14100743-004A1.60 ppb
2015-01-13B15010726-004A1.50 ppb
2015-01-13B15010726-003A0.770 ppb
2015-01-13B15010726-002A0.640 ppb
2015-01-13B15010726-001A1.10 ppb
2015-04-14B15041223-002A1.60 ppb
2015-04-14B15041223-001A1.000 ppb
2015-06-16B15061643-001C0.510 ppb
2015-07-15B15071536-002A1.40 ppb
2015-07-15B15071536-001A1.10 ppb
2015-10-13B15101095-002A1.60 ppb
2015-10-13B15101095-001A0.810 ppb
2016-01-13B16010896-002A1.20 ppb
2016-01-13B16010896-001A0.620 ppb
2016-04-13B16041216-001A1.000 ppb
2016-04-13B16041216-002A1.40 ppb
2016-06-14B16061279-001C0.750 ppb
2016-07-13B16071041-002A1.30 ppb
2016-07-13B16071041-001A1.20 ppb
2016-10-12B16101087-002A2.00 ppb
2016-10-12B16101087-001A1.60 ppb
2017-01-09B17010461-002A1.40 ppb
2017-01-09B17010461-001A1.10 ppb
2017-04-12B17041131-002A2.30 ppb
2017-04-12B17041131-001A1.70 ppb
2017-06-14B17061576-002FND
2017-06-14B17061576-001E0.640 ppb
2017-07-10B17070710-002A1.30 ppb
2017-07-10B17070710-001A1.000 ppb
2017-10-11B17101181-002A2.80 ppb
2017-10-11B17101181-001A2.20 ppb
2018-01-08B18010599-002A1.60 ppb
2018-01-08B18010599-001A1.20 ppb
2018-04-09B18040724-002A1.90 ppb
2018-04-09B18040724-001A1.40 ppb
2018-06-05B18060567-001C0.780 ppb
2018-07-10B18070820-002A1.20 ppb
2018-07-10B18070820-001A1.10 ppb
2018-10-09B18101006-002A1.50 ppb
2018-10-09B18101006-001A1.20 ppb
2019-01-09B19010776-002A1.10 ppb
2019-01-09B19010776-001A0.890 ppb
2019-04-10B19041014-002A1.50 ppb
2019-04-10B19041014-001A1.30 ppb
2019-07-10B19071149-001C0.610 ppb
2019-07-10B19071084-002A1.40 ppb
2019-07-10B19071084-001A1.10 ppb
2019-10-09B19101048-001A1.20 ppb
2019-10-09B19101048-002A1.40 ppb