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National Drinking Water Database


Total haloacetic acids (HAAs) in Montana


Total haloacetic acids refers to the sum of the concentrations of five related disinfection byproducts in a water sample: dichloroacetic acid, trichloroacetic acid, monochloroacetic acid, monobromoacetic acid and dibromoacetic acid. [read more]

The Most Polluted Communities in Montana

214 water utilities reported detecting Total haloacetic acids (HAAs) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Total haloacetic acids (HAAs) level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Brady County Water and Sewer District
Brady, MT
2258 of 8104.23 ppb
(2.8 to 170 ppb)
2North Havre County Water Dist
Havre, MT
9014 of 14103.73 ppb
(42 to 161 ppb)
3Seeley Lake Water District
Seeley Lake, MT
1,57523 of 2365.74 ppb
(35 to 130 ppb)
4Town of Fairview
Fairview, MT
70310 of 1051.3 ppb
(22 to 78 ppb)
5Town of Froid
Froid, MT
1951 of 146 ppb
(46 ppb)
6Butte Silverbow Water Dept
Butte, MT
38,00022 of 2245.71 ppb
(18.75 to 75.92 ppb)
7Pine Hills Youth Correct Facil
Miles City, MT
2501 of 145 ppb
(45 ppb)
8Town of Pinesdale
Pinesdale, MT
8008 of 843.13 ppb
(28 to 59 ppb)
9City of Colstrip
Colstrip, MT
2,00022 of 2242.32 ppb
(23 to 97 ppb)
10City of Glendive
Glendive, MT
4,80622 of 2242.3 ppb
(18 to 99 ppb)

Health Based Limits for Total haloacetic acids (HAAs)

StandardDescriptionLevel
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
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
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.450 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.5200 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.5200 ppb

Violation Summary for Total haloacetic acids (HAAs) in Montana

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in Montana since 2004

Violation TypeNumber of Violations
Monitoring and Reporting Disinfection Byproduct Rule163
Over maximum contaminant level, Average26
Over maximum contaminant level, Single Sample1