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National Drinking Water Database


Chloroform in Alabama


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 Alabama

149 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)
1Gadsden Water Works
Gadsden, AL
47,2892 of 252 ppb
(41.9 to 62.1 ppb)
2Upper Bear Creek Water Authority
Haleyville, AL
1002 of 249.85 ppb
(46.1 to 53.6 ppb)
3Millbrook Utilities
Millbrook, AL
4,2933 of 339.1 ppb
(26 to 59 ppb)
4Athens Utilities
Athens, AL
27,5342 of 239 ppb
(25 to 53 ppb)
5Arab Water Works Board
Arab, AL
31,9992 of 234 ppb
(32 to 36 ppb)
6US Army Aviation & Missile Command
Redstone Arsenal, AL
28,5002 of 233.5 ppb
(32.1 to 34.9 ppb)
7Opelika Water Works Board
Opelika, AL
30,0001 of 133 ppb
(33 ppb)
8Pine Hill Water Department
Pine Hill, AL
2,4181 of 133 ppb
(33 ppb)
9Section-Dutton Water System
Rainsville, AL
28,8002 of 232.1 ppb
(15.4 to 48.8 ppb)
10Five Star Water Supply District
Auburn, AL
1002 of 231 ppb
(15 to 47 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 Alabama

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

Violation TypeNumber of Violations
Failure to monitor regularly4