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National Drinking Water Database


Total trihalomethanes (TTHMs) in Kentucky


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

The Most Polluted Communities in Kentucky

213 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)
1Wallins Water System
Baxter, KY
1,6502 of 2125.5 ppb
(46 to 205 ppb)
2Rosedale Water District Llc
Independence, KY
3462 of 293.5 ppb
(81 to 106 ppb)
3Letcher County Water District
Whitesburg, KY
2,97011 of 1192.18 ppb
(23 to 194 ppb)
4Dawson Springs Water & Sewer
Dawson Springs, KY
3,89410 of 1086.08 ppb
(37 to 130.75 ppb)
5Providence Water Works
Providence, KY
5,34910 of 1085.6 ppb
(42 to 163 ppb)
6Sturgis Water Works
Sturgis, KY
4,0869 of 983.44 ppb
(45 to 149 ppb)
7Beattyville Water Works
Beattyville, KY
7,3529 of 982.89 ppb
(27 to 164 ppb)
8Salyersville Municipal Water
Salyersville, KY
3,25010 of 1081.83 ppb
(18.5 to 202 ppb)
9Booneville Water and Sewer
Booneville, KY
5,77510 of 1080.2 ppb
(10 to 175 ppb)
10Mckee Water Works
Mckee, KY
2,2119 of 979.56 ppb
(18 to 134 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 Kentucky

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

Violation TypeNumber of Violations
Over maximum contaminant level, Average152
Monitoring and Reporting Disinfection Byproduct Rule95