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National Drinking Water Database


Total haloacetic acids (HAAs) in Wyoming


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 Wyoming

141 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)
1Town of Rock River
Rock River, WY
23515 of 1548.36 ppb
(2.19 to 132 ppb)
2Downer Neighborhood I&s District
Sheridan, WY
4001 of 144 ppb
(44 ppb)
3Town of Granger
Moorcroft, WY
16010 of 1043.93 ppb
(18 to 72 ppb)
4City of Evanston
Evanston, WY
12,00025 of 2542.5 ppb
(22 to 107.05 ppb)
5Bridger Valley Joint Powers Board
Granger, WY
1,65020 of 2040.4 ppb
(13.1 to 82 ppb)
6City of Sheridan
Sheridan, WY
15,50021 of 2132.46 ppb
(14 to 57.5 ppb)
7Town of Baggs
Baggs, WY
49011 of 1130.69 ppb
(2.08 to 83 ppb)
8Town of LA Barge
La Barge, WY
5105 of 528.66 ppb
(15.6 to 56.9 ppb)
9South Laramie W&s District
Laramie, WY
5501 of 128.5 ppb
(28.5 ppb)
10Town of Meeteetse
Meeteetsee, WY
3504 of 426.91 ppb
(2.62 to 60 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 Wyoming

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

Violation TypeNumber of Violations
Monitoring and Reporting Disinfection Byproduct Rule20
Over maximum contaminant level, Average3