Bromodichloromethane

Bromodichloromethane is a byproduct formed when chlorine disinfectants react with organic matter in water. It's found in chlorinated tap water and may increase cancer risk.

Bromodichloromethane is one of several trihalomethanes (THMs) created when chlorine-based disinfectants react with organic matter in water. This colorless, sweet-smelling liquid is not naturally present in water sources but forms during the treatment process. The EPA regulates it as part of total THMs, measured in parts per billion (ppb). While health concerns exist, ongoing research aims to better understand its effects. Water utilities work to balance disinfection needs with minimizing THM formation.

People affected
9.9M
Utilities with this contaminant
447
States with this contaminant
28

Utilities with the highest levels of this contaminant

UtilityService AreasLevelPopulation Served
Fosters-Ralph Water Authority
Ralph, AL

1350.000 ppb

11,799

Pike County Water Authority
Troy, AL

610.000 ppb

12,021

Weir River Water System
Hingham, MA

26.700 ppb

45,339

Sudbury Water District
Sudbury, MA

24.500 ppb

18,815

Somerset Water Department
Somerset, MA

19.800 ppb

18,303

Maynard Dpw, Water Division
Maynard, MA

19.580 ppb

10,750

Swansea Water District
Swansea, MA

19.550 ppb

17,144

Owosso, City Of
Owosso, MI

18.000 ppb

16,353

Chelmsford Water District
Chelmsford, MA

14.500 ppb

28,750

Billerica Water Works
Billerica, MA

14.000 ppb

42,119

Sources