Know Your Environment. Protect Your Health.

Bromodichloromethane

Monona Waterworks

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.

 

17

Samples

0

Samples exceeding legal limit (MCL)

12

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20182.06 ppb220.220 ppb - 3.90 ppb
20191.85 ppb21ND - 3.70 ppb
20202.10 ppb112.10 ppb
20212.18 ppb551.000 ppb - 6.50 ppb
20221.87 ppb32ND - 4.70 ppb
20231.55 ppb41ND - 6.20 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
2018-07-113936040010.220 ppb
2018-09-254101340013.90 ppb
2019-04-24442084001ND
2019-09-054678100013.70 ppb
2020-07-205154260012.10 ppb
2021-02-115473620011.20 ppb
2021-02-115473620021.000 ppb
2021-02-115473620011.20 ppb
2021-02-115473620021.000 ppb
2021-09-175843340016.50 ppb
2022-03-226106160010.900 ppb
2022-03-23610869001ND
2022-09-136420920014.70 ppb
2023-03-17668942001ND
2023-03-21669257001ND
2023-03-21669257002ND
2023-07-116879580016.20 ppb