Dibromochloromethane
Dibromochloromethane (DBCM) is one of the four trihalomethanes regulated as part of TTHM (limit 80 ppb), favored when source water contains bromide. Its EPA health goal (MCLG) is 0.06 mg/L.
EPA MCLG Level
0.06 mg/L
Maximum level that poses minimal health risk based on the latest science
Health Effects
Long-term exposure is associated with an increased risk of bladder cancer at the population level; the EPA and IARC classify it as a possible or probable human carcinogen. Liver, kidney, and central-nervous-system effects have been observed at high doses. The risk is chronic and lifetime, not acute.
Common Sources
- Byproduct of disinfecting drinking water with chlorine
- Formed when chlorine reacts with natural organic matter such as decaying leaves, runoff, and algae
- Elevated when the source water contains naturally occurring bromide
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The EPA MCLG for Dibromochloromethane is 0.06 mg/L. Upload your water test (PDF or a photo) and we'll email a plain-English reading of where your result lands — and every other number — free. Educational only, no medical claims.
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Where is Dibromochloromethane Found?
Dibromochloromethane has been detected above EPA health guidelines in 944 cities serving 27.2M people across the US.
and 939 more cities
EPA MCLG Level
The EPA MCLG represents the maximum level that poses minimal health risk based on the latest scientific research. It's often more protective than federal legal limits.
Contaminant Type
Dibromochloromethane is classified as a Disinfection Byproducts contaminant.
Related Disinfection Byproducts Contaminants
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