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National Drinking Water Database


National Drinking Water Database - Chemical Contaminants

Dibromomethane


Status: Unregulated - EPA has not established a maximum legal limit in tapwater for this contaminant.

Dibromomethane is an unregulated byproduct of tap water disinfection and a manufactured chemical used in chemical synthesis and as an ingredient in fire extinguishing fluids.

 
Detected
Found above
health guidelines
Found above
legal limit
States
22
-
-
Water utilities
125
-
-
People Served
5,411,995
-
-

Health Concerns for Dibromomethane:


Dibromomethane Exposure by State

Water utilities in 22 states have reported detecting Dibromomethane in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with Dibromomethane contamination
SystemsPopulation
Texas333,175,945
California7704,290
Nebraska1506,420
Massachusetts12299,951
Wisconsin12202,689
Rhode Island278,969
New York1176,509
New Jersey474,703
Arkansas873,487
New Mexico658,093
Indiana432,708
Delaware227,606
North Carolina527,378
Iowa326,881
Washington220,690
Minnesota514,657
Alabama19,000
Michigan21,034
Missouri1464
Alaska1295
Montana2148
Virginia178
Total1255,411,995

The Most Polluted Communities

125 water utilities reported detecting Dibromomethane in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Dibromomethane level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1City of Miles
Miles, TX
7911 of 15.6 ppb
(5.6 ppb)
2Andover Water Dept
Andover, MA
31,3442 of 34.37 ppb
(0 to 7.2 ppb)
3Cambridge Water Department
Cambridge, MA
101,3551 of 13.5 ppb
(3.5 ppb)
4Black Stump
Greensboro, VA
781 of 13.2 ppb
(3.2 ppb)
5Brownsville Waterworks
Brownsville, WI
5611 of 12.1 ppb
(2.1 ppb)
6Lisbon Water Association
El Dorado, AR
39910 of 161.98 ppb
(0 to 5.96 ppb)
7Brayton Water System
Brayton, IA
1451 of 11.5 ppb
(1.5 ppb)
8Ironwood Township
Ironwood, MI
9331 of 11.3 ppb
(1.3 ppb)
9Clearlake Oaks County Water District
Clearlake Oaks, CA
2,4581 of 11 ppb
(1 ppb)
10Shan D Water Supply
Tatum, TX
1441 of 30.99 ppb
(0 to 2.98 ppb)

Testing Summary for Dibromomethane

Are tests routinely required for Dibromomethane by federal law?No
Water suppliers reporting tests for Dibromomethane (2004-2009):21,159 of 47,576
Average testing rate for water supplier reporting tests (2004-2009):0.6 per year

Occupational hazards

Type of concern: Reference:
Allowed workplace exposures restricted to low doses European Union - Classification & Labelling

Cancer

Type of concern: Reference:
One or more in vitro tests on mammalian cells show positive mutation results RTECS®- Toxicological and Environmental Chemistry 1987
Mutagen - limited evidence EPA Water Disinfection By-Products Carcinogenicity
One or more in vitro tests non-mammalian cells show positive mutation results RTECS®- Bulletin of Environmental Contamination and Toxicology 1980
One or more in vitro tests non-mammalian cells show positive mutation results RTECS®- Toxicological and Environmental Chemistry 1987
One or more in vitro tests non-mammalian cells show positive mutation results RTECS®- Chemical Research in Toxicology 2004

Organ system toxicity (non-reproductive)

Type of concern: Reference:
One or more animal studies show classified as toxic effects at moderate doses (low dose studies may be unavailable for this ingredient) EPA Toxic Release Inventory PBTs
Classified as not expected to be potentially toxic or harmful Environment Canada Domestic Substance List

Ecotoxicology

Type of concern: Reference:
Wildlife and environmental toxicity European Union - Classification & Labelling
Not suspected to be an environmental toxin Environment Canada Domestic Substance List

Persistence and bioaccumulation

Type of concern: Reference:
Not suspected to be bioaccumulative Environment Canada Domestic Substance List



Government, industry, academic studies and classifications

government/industry list/academic study appears on list as classification(s)
European Union - Classification & LabellingDIBROMOMETHANE•Harmful
•Harmful by inhalation
•Harmful to aquatic organisms
EPA Water Disinfection By-Products CarcinogenicityDIBROMOMETHANE•Moderate concern for potential carcinogenicity
EPA Toxic Release Inventory PBTsDIBROMOMETHANE•Toxic, U.S. Environmental Protection Agency Toxics Release Inventory programs
Environment Canada Domestic Substance ListMETHANE, DIBROMO-•This chemical was NOT flagged by CEPA for further attention. The chemical was flagged for suspected persistence.
RTECS®- Bulletin of Environmental Contamination and Toxicology 1980DIBROMOMETHANE• mutagenic - Positive mutation assay: Mutation in Micro-organism (Salmonella typhimurium )
RTECS®- Chemical Research in Toxicology 2004DIBROMOMETHANE• mutagenic - Positive mutation assay: Mutation in Micro-organism (Escherichia coli )
RTECS®- Toxicological and Environmental Chemistry 1987DIBROMOMETHANE• mutagenic - Positive mutation assay: Mutation in Micro-organism (Salmonella typhimurium )
• mutagenic - Positive mutation assay: Cytogenetic Analysis (hamster lng)



references

government/industry list/academic study reference
European Union - Classification & LabellingCPS&Q (Consumer Products Safety & Quality) formely known as ECB (European Chemicals Bureau). 2008. Classification and Labelling: Chemicals: Annex VI of Directive 67/548/EEC through the 31st ATP.
EPA Water Disinfection By-Products CarcinogenicityEPA (U.S. Environmental Protection Agency). 2006. EPA Water Disinfection By-Products with Carcinogenicity Estimates. Last updated: 10 April 2006.
EPA Toxic Release Inventory PBTsEPA (U.S. Environmental Protection Agency). 1999. Toxics Release Inventory Program. PBT Chemical Rule.
Environment Canada Domestic Substance ListEC (Environment Canada). 2008. Domestic Substances List Categorization. Canadian Environmental Protection Act (CEPA) Environmental Registry.
RTECS®- Bulletin of Environmental Contamination and Toxicology 1980RTECS®- Bulletin of Environmental Contamination and Toxicology. (Springer-Verlag New York, Inc., Service Center, 44 Hartz Way, Secaucus, NJ 07094) V.1- 24,590,1980
RTECS®- Chemical Research in Toxicology 2004RTECS®- Chemical Research in Toxicology. (American Chemical Soc., Distribution Office Dept. 223, POB 57/36, West End Station, Washington, DC 20037) V.1- 17,742,2004
RTECS®- Toxicological and Environmental Chemistry 1987RTECS®- Toxicological and Environmental Chemistry. (Gordon & Breach Science Pub. Inc., 1 Park Ave., New York, NY 10016) V.3(3/4)- 13,205,1987

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