Know Your Environment. Protect Your Health.

Bromodichloromethane

Bear Mountain Water Supply

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

22

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20184.75 ppb43ND - 9.40 ppb
20195.74 ppb552.60 ppb - 11.0 ppb
20205.55 ppb43ND - 11.0 ppb
20217.29 ppb445.47 ppb - 10.00 ppb
20227.58 ppb226.80 ppb - 8.35 ppb
20235.66 ppb552.08 ppb - 7.51 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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 02061811:35.70 ppb
2018-05-07DBP 05071819-13.90 ppb
2018-07-25TTHM 07251829-19.40 ppb
2018-11-13TTHM 11151803:1ND
2019-02-05TTHM 02061903A:12.60 ppb
2019-02-05TTHMS 02061903A:12.60 ppb
2019-05-08TTHMS 050819054.80 ppb
2019-08-07TTHM 0814190711.0 ppb
2019-11-04TTHMS QB1927477.70 ppb
2020-02-05DBP 02062004:13.70 ppb
2020-05-13DBP9 05132006:1ND
2020-08-13TTHM 0813201311.0 ppb
2020-11-04DBP 11042008-17.50 ppb
2021-02-16TTHM 11042008:15.57 ppb
2021-05-05DBP 05052105:15.47 ppb
2021-08-04TTHMS 08042105C10.00 ppb
2021-11-17TTHMS 11172114-18.10 ppb
2022-05-25TTHMS 052622036.80 ppb
2022-10-25TTHMS 10262215B:48.35 ppb
2023-01-27TTHMS 01272306-102.08 ppb
2023-06-15TTHM 06152304:17.51 ppb
2023-10-02TTHM 10042313B:16.90 ppb
2023-10-13TTHMS 12132334:15.90 ppb
2023-12-13TTHM 12132334-15.90 ppb