The Power of Information

National Drinking Water Database

Artesian Water Company Utilities - Wilmington, DE

Serves 201,000 people


Copper is a naturally occuring metal and drinking water contaminant that enters tap water by corrosion of household plumbing systems and erosion of natural deposits.
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
6 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
51 days
Tests ConductedNumber of individual tests done for this contaminant
132 tests

Testing Summary

Health Limit
Legal Limit

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
CopperCopper is a naturally occuring metal and drinking water contaminant that enters tap water by corrosion of household plumbing systems and erosion of natural deposits.72.65 ppb
882 ppb
300 ppb
1000 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 Copper

Health Based Limits for Copper

California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.300 ppb
National Secondary Drinking Water RegulationsA National Secondary Drinking Water Regulation is a non-enforceable guideline regarding contaminants that may cause cosmetic effects (such as taste, odor, or color). Some states choose to adopt them as enforceable standards. Source: U.S. Environmental Protection Agency. 1000 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.1300 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.1300 ppb

Testing Results

Testing DateAverage
Samples taken that dayNumber of Non-DetectsRange of Results
2007-08-070 ppb110 ppb
2007-08-0219.67 ppb308 to 28 ppb
2007-07-2510 ppb1010 ppb
2007-06-13316 ppb10316 ppb
2007-05-236.17 ppb630 to 18 ppb
2007-05-16882 ppb10882 ppb
2007-04-2535.25 ppb410 to 80 ppb
2007-03-20172.67 ppb310 to 376 ppb
2007-02-220 ppb330 ppb
2007-02-214.6 ppb520 to 9 ppb
2007-02-03382 ppb10382 ppb
2007-01-0911 ppb1011 ppb
2007-01-0354 ppb1054 ppb
2006-01-3020 ppb1020 ppb
2006-01-2835 ppb1035 ppb
2006-01-2722 ppb1022 ppb
2006-01-26256 ppb10256 ppb
2006-01-2515.5 ppb407 to 40 ppb
2006-01-2410 ppb1010 ppb
2006-01-22381 ppb10381 ppb
2006-01-215 ppb105 ppb
2006-01-188.67 ppb320 to 26 ppb
2006-01-140 ppb220 ppb
2006-01-120.7 ppb1090 to 7 ppb
2006-01-074 ppb420 to 8 ppb
2006-01-068 ppb108 ppb
2006-01-0515.43 ppb720 to 84 ppb
2005-01-287 ppb107 ppb
2005-01-2719 ppb2015 to 23 ppb
2005-01-2513 ppb605 to 27 ppb
2005-01-233 ppb310 to 6 ppb
2005-01-2210 ppb1010 ppb
2005-01-20326 ppb10326 ppb
2005-01-171 ppb430 to 4 ppb
2005-01-1683 ppb2048 to 118 ppb
2005-01-1569.22 ppb910 to 412 ppb
2005-01-13<0.01 ppb10< .01 to 0.007 ppb
2005-01-030 ppb110 ppb
2004-01-30319 ppb10319 ppb
2004-01-294 ppb104 ppb
2004-01-2829 ppb2028 to 30 ppb
2004-01-2710 ppb1010 ppb
2004-01-2522.5 ppb2012 to 33 ppb
2004-01-246 ppb205 to 7 ppb
2004-01-2011 ppb607 to 18 ppb
2004-01-191.5 ppb210 to 3 ppb
2004-01-180 ppb220 ppb
2004-01-1556.25 ppb410 to 180 ppb
2004-01-0920.33 ppb320 to 61 ppb
2004-01-0512 ppb1012 ppb
2004-01-037.6 ppb510 to 17 ppb