The Power of Information

National Drinking Water Database


Artesian Water Company Utilities - Wilmington, DE


Serves 201,000 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
144 days
Tests ConductedNumber of individual tests done for this contaminant
678 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.4.19 ppb
65.6 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
2007-12-1717.49 ppb1610 to 36 ppb
2007-12-040.45 ppb430 to 1.8 ppb
2007-11-271.8 ppb101.8 ppb
2007-11-0816.4 ppb1016.4 ppb
2007-11-0212.9 ppb1012.9 ppb
2007-11-010.6 ppb100.6 ppb
2007-10-1712.37 ppb2860 to 54.4 ppb
2007-10-100 ppb220 ppb
2007-10-040 ppb330 ppb
2007-09-060 ppb330 ppb
2007-08-070 ppb110 ppb
2007-08-031.1 ppb101.1 ppb
2007-08-020 ppb330 ppb
2007-08-010.3 ppb210 to 0.6 ppb
2007-07-310 ppb110 ppb
2007-07-250 ppb220 ppb
2007-07-192 ppb102 ppb
2007-07-1315.77 ppb1210 to 48.7 ppb
2007-07-050 ppb440 ppb
2007-06-290 ppb330 ppb
2007-06-131.05 ppb200.6 to 1.5 ppb
2007-05-290 ppb220 ppb
2007-05-230.4 ppb640 to 1.7 ppb
2007-05-091.6 ppb101.6 ppb
2007-05-020 ppb110 ppb
2007-04-2612.63 ppb1210 to 38.9 ppb
2007-04-250 ppb440 ppb
2007-04-051.6 ppb101.6 ppb
2007-03-290 ppb220 ppb
2007-03-200.3 ppb320 to 0.9 ppb
2007-03-131.5 ppb101.5 ppb
2007-02-2711.88 ppb1210 to 32 ppb
2007-02-223.33 ppb320 to 10 ppb
2007-02-210 ppb550 ppb
2007-02-080.6 ppb100.6 ppb
2007-01-090 ppb110 ppb
2007-01-040 ppb220 ppb
2007-01-030 ppb330 ppb
2006-01-300 ppb330 ppb
2006-01-290 ppb110 ppb
2006-01-280.38 ppb540 to 1.9 ppb
2006-01-278.62 ppb24130 to 31 ppb
2006-01-2611.91 ppb1410 to 30.3 ppb
2006-01-250.17 ppb980 to 1.5 ppb
2006-01-2412.12 ppb1540 to 28.4 ppb
2006-01-230.35 ppb430 to 1.4 ppb
2006-01-220 ppb440 ppb
2006-01-212.38 ppb640 to 13.1 ppb
2006-01-2012.23 ppb301.2 to 34.3 ppb
2006-01-180 ppb10100 ppb
2006-01-170 ppb110 ppb
2006-01-158.03 ppb320 to 24.1 ppb
2006-01-148.15 ppb430 to 32.6 ppb
2006-01-130.4 ppb320 to 1.2 ppb
2006-01-120 ppb880 ppb
2006-01-111.8 ppb101.8 ppb
2006-01-0930.5 ppb1030.5 ppb
2006-01-080 ppb770 ppb
2006-01-070.35 ppb430 to 1.4 ppb
2006-01-0613.75 ppb401.7 to 29.8 ppb
2006-01-050.36 ppb750 to 1.3 ppb
2006-01-030.57 ppb320 to 1.7 ppb
2006-01-010 ppb220 ppb
2005-01-280 ppb220 ppb
2005-01-270 ppb220 ppb
2005-01-2626.46 ppb2300.7 to 63.1 ppb
2005-01-2518.87 ppb33120 to 78.3 ppb
2005-01-234.25 ppb430 to 17 ppb
2005-01-220 ppb110 ppb
2005-01-210.3 ppb430 to 1.2 ppb
2005-01-200.3 ppb320 to 0.9 ppb
2005-01-190.3 ppb320 to 0.9 ppb
2005-01-1853.1 ppb1053.1 ppb
2005-01-175.8 ppb540 to 29 ppb
2005-01-160.55 ppb210 to 1.1 ppb
2005-01-150 ppb990 ppb
2005-01-140 ppb880 ppb
2005-01-134.6 ppb300.8 to 11.9 ppb
2005-01-120 ppb220 ppb
2005-01-1165.6 ppb1065.6 ppb
2005-01-100.58 ppb100.58 ppb
2005-01-080.8 ppb200.7 to 0.9 ppb
2005-01-0717 ppb1017 ppb
2005-01-050.37 ppb320 to 1.1 ppb
2005-01-030.29 ppb210 to 0.57 ppb
2005-01-010.7 ppb100.7 ppb
2004-12-280 ppb110 ppb
2004-12-150 ppb110 ppb
2004-12-090.7 ppb100.7 ppb
2004-11-020.57 ppb310 to 0.9 ppb
2004-10-260 ppb110 ppb
2004-10-190 ppb330 ppb
2004-10-1319.97 ppb1210 to 41 ppb
2004-09-140.4 ppb210 to 0.8 ppb
2004-08-050.2 ppb430 to 0.8 ppb
2004-07-150 ppb110 ppb
2004-07-1420.33 ppb1230 to 49 ppb
2004-07-090.18 ppb540 to 0.9 ppb
2004-06-210 ppb110 ppb
2004-06-150 ppb220 ppb
2004-06-043.5 ppb103.5 ppb
2004-05-200 ppb220 ppb
2004-05-130.45 ppb210 to 0.9 ppb
2004-04-290 ppb110 ppb
2004-04-2717 ppb1017 ppb
2004-04-150 ppb110 ppb
2004-04-140.45 ppb210 to 0.9 ppb
2004-04-1311.88 ppb1230 to 32 ppb
2004-03-300 ppb110 ppb
2004-03-240 ppb220 ppb
2004-03-180 ppb220 ppb
2004-03-081 ppb101 ppb
2004-02-2511.45 ppb200.9 to 22 ppb
2004-02-190 ppb110 ppb
2004-02-100 ppb110 ppb
2004-02-040.6 ppb100.6 ppb
2004-02-030 ppb110 ppb
2004-01-300 ppb330 ppb
2004-01-290 ppb110 ppb
2004-01-280 ppb660 ppb
2004-01-2717 ppb1017 ppb
2004-01-260 ppb330 ppb
2004-01-2511.45 ppb200.9 to 22 ppb
2004-01-240 ppb440 ppb
2004-01-2215 ppb2460 to 61 ppb
2004-01-210 ppb330 ppb
2004-01-200.44 ppb740 to 1.7 ppb
2004-01-190 ppb550 ppb
2004-01-180.5 ppb320 to 1.5 ppb
2004-01-177.6 ppb107.6 ppb
2004-01-160 ppb440 ppb
2004-01-150 ppb330 ppb
2004-01-1410.82 ppb25130 to 49 ppb
2004-01-1310.15 ppb38140 to 41 ppb
2004-01-120.06 ppb980 to 0.54 ppb
2004-01-110 ppb110 ppb
2004-01-100.67 ppb650 to 3.99 ppb
2004-01-090.43 ppb960 to 2.3 ppb
2004-01-081 ppb101 ppb
2004-01-060 ppb110 ppb
2004-01-050.16 ppb970 to 0.8 ppb
2004-01-042.05 ppb200.6 to 3.5 ppb
2004-01-030 ppb550 ppb
2004-01-028.94 ppb510 to 22 ppb