The Power of Information

National Drinking Water Database


City of Raleigh Public Utilities Department Utilities - Raleigh, NC


Serves 409,542 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
32 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
33 days
Tests ConductedNumber of individual tests done for this contaminant
244 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.33.83 ppb
74.1 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
2009-01-070 ppb110 ppb
2007-11-1330.6 ppb2019.6 to 41.6 ppb
2007-08-1648.44 ppb14039.5 to 57.6 ppb
2007-08-0653.7 ppb1053.7 ppb
2007-06-1133.78 ppb18027 to 43 ppb
2007-03-3054.5 ppb6036.7 to 64.9 ppb
2007-03-2956.3 ppb19023 to 85.1 ppb
2007-02-0925.56 ppb18023 to 28 ppb
2007-01-2628.5 ppb4023 to 31 ppb
2007-01-1621.55 ppb2019.2 to 23.9 ppb
2006-11-1326.89 ppb18021 to 39 ppb
2006-10-1942.13 ppb4032 to 58.1 ppb
2006-08-2666.8 ppb1066.8 ppb
2006-08-1063.45 ppb2061.1 to 65.8 ppb
2006-08-0767.88 ppb17057 to 120.6 ppb
2006-07-2774.1 ppb4055.9 to 107 ppb
2006-05-3018.1 ppb1018.1 ppb
2006-05-2327.9 ppb2027.2 to 28.6 ppb
2006-05-1643 ppb1043 ppb
2006-05-0825.48 ppb16018.1 to 50.4 ppb
2006-02-2016.9 ppb1016.9 ppb
2006-02-0617.49 ppb15014.6 to 23.9 ppb
2005-11-1721 ppb10020 to 30 ppb
2005-08-2230 ppb1030 ppb
2005-08-1134 ppb10020 to 50 ppb
2005-05-1820 ppb1020 ppb
2005-05-1736 ppb10030 to 40 ppb
2005-02-0120 ppb10020 ppb
2004-11-0320 ppb8020 ppb
2004-08-3121.25 ppb8020 to 30 ppb
2004-08-0620 ppb1020 ppb
2004-05-1130 ppb9030 ppb
2004-02-1621.11 ppb9020 to 30 ppb