The Power of Information

National Drinking Water Database


Charlotte-Mecklenburg Utilities Utilities - Charlotte, NC


Serves 761,830 people

Chloroform

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.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
33 days
Test Days Exceeding Legal LimitsNumber of days in which the samples taken in that day exceed the Maximum Contaminant Level (Depending on the contaminant and its MCL, that may or may not trigger an MCL violation. Some MCLs are based on averages spanning several months to a year)
0 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
35 days
Tests ConductedNumber of individual tests done for this contaminant
453 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
ChloroformChloroform 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.27.78 ppb
62.65 ppb
Yes
5.7 ppb
No
80 ppb
NOTE: Each dot in the above graph represents one month.
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Health Based and Legal Limits for Chloroform

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

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2008-08-060 ppb770 ppb
2008-02-040 ppb440 ppb
2007-12-1815.75 ppb4012 to 22 ppb
2007-11-1332 ppb1032 ppb
2007-08-2049.88 ppb3041.49 to 58.68 ppb
2007-08-0146.38 ppb24036 to 69 ppb
2007-05-0333.63 ppb24021 to 47 ppb
2007-05-0237.05 ppb5028.24 to 48.16 ppb
2007-02-1515.04 ppb720 to 23.8 ppb
2007-02-0821 ppb22016 to 26 ppb
2006-11-1624.04 ppb5020.4 to 29.3 ppb
2006-11-0234.83 ppb24019 to 210 ppb
2006-08-1836 ppb1036 ppb
2006-08-1062.65 ppb23029 to 510 ppb
2006-06-0624.36 ppb720 to 42.7 ppb
2006-05-0436.38 ppb24029 to 48 ppb
2006-02-1021.63 ppb24018 to 29 ppb
2006-02-0922.2 ppb5018.2 to 25.7 ppb
2005-11-0327.24 ppb29020 to 40 ppb
2005-09-1230 ppb5020 to 40 ppb
2005-08-1843.75 ppb24030 to 60 ppb
2005-06-2318 ppb5010 to 20 ppb
2005-06-0832.5 ppb24020 to 50 ppb
2005-03-2215 ppb2010 to 20 ppb
2005-03-0920 ppb3020 ppb
2005-02-0922.92 ppb24010 to 30 ppb
2004-12-0133.45 ppb29020 to 40 ppb
2004-08-2326 ppb5020 to 40 ppb
2004-08-1150 ppb22020 to 80 ppb
2004-05-2030 ppb1030 ppb
2004-05-1728 ppb5010 to 40 ppb
2004-05-0530.42 ppb24020 to 50 ppb
2004-03-1218 ppb5010 to 20 ppb
2004-03-0118.75 ppb8010 to 20 ppb
2004-02-0415.42 ppb24010 to 20 ppb