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National Drinking Water Database

Dibromomethane in California

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.

The Most Polluted Communities in California

7 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
1Clearlake Oaks County Water District
Clearlake Oaks, CA
2,4581 of 11 ppb
(1 ppb)
2Coastside County Water District
Half Moon Bay, CA
12,0001 of 310.39 ppb
(0 to 12 ppb)
3City of Riverside Public Utilities
Riverside, CA
280,832143 of 2560.18 ppb
(0 to 0.6 ppb)
4Calleguas Municipal Water Dist
Thousand Oaks, CA
02 of 110.08 ppb
(0 to 0.7 ppb)
5Yucaipa Valley WD Id-A&2
Yucaipa, CA
34,0001 of 490.05 ppb
(0 to 2.6 ppb)
6Glendale-City, Water Dept.
Glendale, CA
200,0001 of 317< 0.01 ppb
(0 to 0.8 ppb)
7San Bernardino City
San Bernardin0, CA
175,0001 of 210< 0.01 ppb
(0 to 0.09 ppb)

Health Based Limits for Dibromomethane

There are no health based standards that EWG is using for this chemical

Violation Summary for Dibromomethane in California

There are no violations reported for this contaminant in California