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National Drinking Water Database


Dichlorodifluoromethane in Alaska


Dichlorodifluoromethane (Freon 12) is a chlorofluorocarbon refrigerant and aerosol spray propellant; it was banned under the Montreal Protocol as of 2000 because of its ozone-depleting properties.

The Most Polluted Communities in Alaska

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

Ranked by highest average Dichlorodifluoromethane level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Ykhc Hospital - Bethel
Bethel, AK
5102 of 211.55 ppb
(8.1 to 15 ppb)
2Maranatha Water Utilities
Eagle River, AK
2201 of 12.1 ppb
(2.1 ppb)
3South Naknek Water System
South Nakn, AK
661 of 12.05 ppb
(2.05 ppb)
4Tanana Safewater Facility
Tanana, AK
3511 of 21.52 ppb
(0 to 3.04 ppb)
5Gulkana Village
Gakona, AK
832 of 31.09 ppb
(0 to 2.64 ppb)
6Nsbu - Kaktovik (Barter Is)
Barrow, AK
3031 of 21.04 ppb
(0 to 2.08 ppb)
7Emmonak Water System
Emmonak, AK
8201 of 40.3 ppb
(0 to 1.2 ppb)

Health Based Limits for Dichlorodifluoromethane

StandardDescriptionLevel
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.1000 ppb
Health-Based Screening LevelA benchmark concentration of contaminants in water that may be of potential concern for human health, if exceeded. For noncarcinogens, the HBSL represents the contaminant concentration in drinking water that is not expected to cause any adverse effects over a lifetime of exposure. For carcinogens, the HBSL range represents the contaminant concentration in drinking water that corresponds to an excess estimated lifetime cancer risk of 1 chance in 1 million to 1 chance in 10 thousand. Source: U.S. Geological Survey.1000 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.5000 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.40000 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.40000 ppb

Violation Summary for Dichlorodifluoromethane in Alaska

There are no violations reported for this contaminant in Alaska