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National Drinking Water Database


Bromodichloromethane in California


Bromodichloromethane 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

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

Ranked by highest average Bromodichloromethane level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Loma Mar Mutual
Loma Mar, CA
1087 of 746.3 ppb
(24.85 to 77.75 ppb)
2City of Huron
Huron, CA
5,8601 of 135.9 ppb
(35.9 ppb)
3LA Jolla Farms
Firebaugh, CA
302 of 235.7 ppb
(23.8 to 47.6 ppb)
4Csa No. 31 Stonegate Ws
Hollister, CA
2521 of 134 ppb
(34 ppb)
5Lanare Community Services Dist
Riverdale, CA
3001 of 232.2 ppb
(0 to 64.4 ppb)
6Fcsa #32/Cantua Creek
Cantua Creek, CA
2301 of 128.1 ppb
(28.1 ppb)
7Oro Loma School
Firebaugh, CA
1007 of 728.07 ppb
(2.45 to 56 ppb)
8Harris Farms South #101-144
Coalinga, CA
1601 of 127.7 ppb
(27.7 ppb)
9Winterhaven Wd
Winterhaven, CA
1,05010 of 1127.55 ppb
(0 to 51 ppb)
10Inverness Public Utility Dist
Inverness, CA
1,20018 of 1826.63 ppb
(14.91 to 44.25 ppb)

Health Based Limits for Bromodichloromethane

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.0.55 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.0.55 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.1 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.60 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
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.100 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.100 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.1000 ppb

Violation Summary for Bromodichloromethane in California

There are no violations reported for this contaminant in California