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National Drinking Water Database


Bromoform in California


Bromoform is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water. [read more]

The Most Polluted Communities in California

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

Ranked by highest average Bromoform level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Venture Estates Mwc
Hollister, CA
532 of 360.67 ppb
(0 to 110 ppb)
2Seventh Standard Mutual
Bakersfield, CA
601 of 142.95 ppb
(42.95 ppb)
3Ellwood Mutual Water Co.
Goleta, CA
1862 of 241.65 ppb
(41.3 to 42 ppb)
4Hills Ranch Mutual Water Company
Mendocino, CA
3511 of 1338.48 ppb
(0 to 59 ppb)
5Jacumba Community Sd
Jacumba, CA
5004 of 427.13 ppb
(14.6 to 35.6 ppb)
6Rancho Colina Mobile Home Park
Morro Bay, CA
2502 of 225 ppb
(16 to 34 ppb)
7City of Avenal
Avenal, CA
16,3493 of 321.83 ppb
(16 to 25.73 ppb)
8Rancho San Joaquin Mwc
Hollister, CA
771 of 121 ppb
(21 ppb)
9Palomino Lakes Mutual Water Co.
Cloverdale, CA
4154 of 420.13 ppb
(6.5 to 35 ppb)
10Sutter Co. Wwd#1 (Robbins)
Robbins, CA
1201 of 120 ppb
(20 ppb)

Health Based Limits for Bromoform

StandardDescriptionLevel
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.0 ppb
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.4.3 ppb
One in one million (10-6) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 1,000,000. Source: U.S. Environmental Protection Agency.8 ppb
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.80 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.200 ppb
One in ten thousand (10-4) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 10,000. Source: U.S. Environmental Protection Agency.800 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.1000 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.5000 ppb

Violation Summary for Bromoform in California

There are no violations reported for this contaminant in California