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National Drinking Water Database


Dichloroacetic acid in Montana


Dichloroacetic acid is a disinfection byproduct regulated by EPA as one of five haloacetic acids that are formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water. [read more]

The Most Polluted Communities in Montana

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

Ranked by highest average Dichloroacetic acid level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Brady County Water and Sewer District
Brady, MT
2258 of 948.24 ppb
(0 to 94 ppb)
2North Havre County Water Dist
Havre, MT
9011 of 1144.73 ppb
(22 to 77 ppb)
3Town of Froid
Froid, MT
1951 of 125 ppb
(25 ppb)
4Power Teton County Water Dist
Power, MT
1673 of 324 ppb
(22 to 25 ppb)
5South Chester County Water Dist
Chester, MT
553 of 323.33 ppb
(17 to 27 ppb)
6Hill County Water Districts
Kremlin, MT
1,72013 of 1423.32 ppb
(0 to 69 ppb)
7Town of Bainville
Bainville, MT
1561 of 123 ppb
(23 ppb)
8Seeley Lake Water District
Seeley Lake, MT
1,57515 of 1521.32 ppb
(3.8 to 58 ppb)
9Mchugh Mobile Home Park
Helena, MT
4901 of 120.2 ppb
(20.2 ppb)
10Pine Hills Youth Correct Facil
Miles City, MT
2501 of 120 ppb
(20 ppb)

Health Based Limits for Dichloroacetic acid

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
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.0.7 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.60 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.70 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.5000 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.5000 ppb

Violation Summary for Dichloroacetic acid in Montana

There are no violations reported for this contaminant in Montana