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National Drinking Water Database


Dibromochloromethane in Washington


Dibromochloromethane 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 Washington

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

Ranked by highest average Dibromochloromethane level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Eagle Cove Water Association
Friday Harbor, WA
6010 of 1031.45 ppb
(22.45 to 41.1 ppb)
2Aleck Bay Park Water System
Lopez Island, WA
367 of 731.1 ppb
(23.3 to 39.6 ppb)
3Penn Cove Water and Sewer District
Oak Harbor, WA
4606 of 621.9 ppb
(6.7 to 33.5 ppb)
4Cape San Juan Water District
Friday Harbor, WA
1413 of 421.3 ppb
(0 to 35.9 ppb)
5Mountain View Water Association
Ferndale, WA
1862 of 221 ppb
(17.5 to 24.5 ppb)
6Hannah Heights Owners Association
Friday Harbor, WA
643 of 516.64 ppb
(0 to 34.5 ppb)
7Hillcrest Village Water Co Inc
Oak Harbor, WA
7706 of 715.9 ppb
(0 to 24 ppb)
8Shirona Water System
Oak Harbor, WA
2303 of 315.77 ppb
(4.1 to 27.2 ppb)
9Valley High Park
Oak Harbor, WA
1413 of 314.63 ppb
(12.6 to 16.5 ppb)
10San Juan Fairways Owners Assn
Friday Harbor, WA
353 of 514 ppb
(0 to 30 ppb)

Health Based Limits for Dibromochloromethane

StandardDescriptionLevel
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.0.4 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.0.8 ppb
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.60 ppb
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters 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.80 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.600 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.600 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.700 ppb

Violation Summary for Dibromochloromethane in Washington

There are no violations reported for this contaminant in Washington