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National Drinking Water Database


Total trihalomethanes (TTHMs) in Alabama


Total trihalomethanes constitute the sum of four disinfection byproducts: chloroform, bromodichloromethane, dibromochloromethane, and bromoform. [read more]

The Most Polluted Communities in Alabama

252 water utilities reported detecting Total trihalomethanes (TTHMs) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Total trihalomethanes (TTHMs) level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Blue Hole Water Company, Inc., The
Hayden, AL
3691 of 1156 ppb
(156 ppb)
2Steele Water Works Board
Steele, AL
1,6201 of 1115.7 ppb
(115.7 ppb)
3Dauphin Island Water & Sewer
Dauphin Island, AL
5,7698 of 888.64 ppb
(11 to 220 ppb)
4York Water System/City of York
York, AL
3,70812 of 1288.24 ppb
(26.45 to 191.5 ppb)
5Crossville Water Board
Crossville, AL
1,9501 of 184.5 ppb
(84.5 ppb)
6Sellers Station Water System
Lapine, AL
1,7467 of 866.63 ppb
(0 to 173 ppb)
7Jasper Utilities Board
Jasper, AL
27,9009 of 965.76 ppb
(9.8 to 125 ppb)
8Jackson Water Works & Sewer Board
Jackson, AL
7,60212 of 1264.23 ppb
(17.1 to 130 ppb)
9Goodwater Utilities Board
Goodwater, AL
2,3708 of 861.16 ppb
(16.7 to 137.6 ppb)
10Kushla Water District
Eight Mile, AL
5,1362 of 260 ppb
(55 to 65 ppb)

Health Based Limits for Total trihalomethanes (TTHMs)

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.9.8 ppb
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.11.5 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
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.130 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.980 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.1835 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.4860 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.10600 ppb

Violation Summary for Total trihalomethanes (TTHMs) in Alabama

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

Violation TypeNumber of Violations
Over maximum contaminant level, Average106
Monitoring and Reporting Disinfection Byproduct Rule67