Know Your Environment. Protect Your Health.

Dibromochloromethane

Bear Mountain Water Supply

Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

 

24

Samples

0

Samples exceeding legal limit (MCL)

22

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.000 ppb440.500 ppb - 1.40 ppb
20191.04 ppb550.700 ppb - 2.20 ppb
20200.825 ppb43ND - 1.80 ppb
20211.19 ppb440.860 ppb - 1.70 ppb
20221.17 ppb221.10 ppb - 1.23 ppb
20230.810 ppb54ND - 1.10 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.1 ppb

The EWG Health Guideline of 0.1 ppb for dibromochloromethane was based on the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer and harm to fetal growth and development.

ppb = parts per billion

All test results

Date Lab ID Result
2018-02-05TTHMS 02061811:31.000 ppb
2018-05-07DBP 05071819-10.500 ppb
2018-07-25TTHM 07251829-11.40 ppb
2018-11-13TTHM 11151803:11.10 ppb
2019-02-05TTHMS 02061903A:10.700 ppb
2019-02-05TTHM 02061903A:10.700 ppb
2019-05-08TTHMS 050819050.800 ppb
2019-08-07TTHM 081419072.20 ppb
2019-11-04TTHMS QB1927470.800 ppb
2020-02-05DBP 02062004:10.700 ppb
2020-05-13DBP9 05132006:1ND
2020-08-13TTHM 081320131.80 ppb
2020-11-04DBP 11042008-10.800 ppb
2021-02-16TTHM 11042008:10.990 ppb
2021-05-05DBP 05052105:10.860 ppb
2021-08-04TTHMS 08042105C1.70 ppb
2021-11-17TTHMS 11172114-11.20 ppb
2022-05-25TTHMS 052622031.10 ppb
2022-10-25TTHMS 10262215B:41.23 ppb
2023-01-27TTHMS 01272306-10ND
2023-06-15TTHM 06152304:11.05 ppb
2023-10-02TTHM 10042313B:10.800 ppb
2023-10-13TTHMS 12132334:11.10 ppb
2023-12-13TTHM 12132334-11.10 ppb