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National Drinking Water Database


Chloroform in Alaska


Chloroform 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 Alaska

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

Ranked by highest average Chloroform level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Golovin Community Water System
Golovin, AK
1504 of 4185.75 ppb
(141 to 233 ppb)
2Gulkana Village
Gakona, AK
8314 of 14138.24 ppb
(14 to 240 ppb)
3Thorne Bay
Thorne Bay, AK
95715 of 15136.93 ppb
(14.3 to 230 ppb)
4Selawik Safewater Facility
Selawik, AK
8008 of 8133.86 ppb
(99.85 to 190 ppb)
5Saxman
Ketchikan, AK
45019 of 19122.57 ppb
(55 to 202 ppb)
6Kasaan
Ketchikan, AK
4613 of 13109.67 ppb
(22.8 to 229 ppb)
7Newtok Water System
Newtok, AK
2151 of 1105 ppb
(105 ppb)
8Buckland Water System
Buckland, AK
4178 of 8104.18 ppb
(15.1 to 240 ppb)
9Chalkyitsik Village Water
Chalkyitsik, AK
1107 of 785.92 ppb
(3.35 to 180 ppb)
10Emmonak Water System
Emmonak, AK
82015 of 1585.29 ppb
(30.5 to 181 ppb)

Health Based Limits for Chloroform

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.5.7 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.35 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.70 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.70 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 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.4000 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.4000 ppb

Violation Summary for Chloroform in Alaska

There are no violations reported for this contaminant in Alaska