The Power of Information

National Drinking Water Database

Louisville Water Company Utilities - Louisville, KY

Serves 836,926 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
0 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
46 days
Tests ConductedNumber of individual tests done for this contaminant
190 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.78.41 ppb
290 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
2008-10-069.75 ppb401.5 to 18 ppb
2008-07-07110.5 ppb4037 to 184 ppb
2008-07-0563 ppb2063 ppb
2008-07-03290 ppb40142 to 438 ppb
2008-07-02284 ppb20284 ppb
2008-07-01194.6 ppb10027 to 403 ppb
2008-06-2573 ppb2073 ppb
2008-06-1960 ppb2060 ppb
2008-06-16197 ppb20197 ppb
2008-06-1468 ppb2068 ppb
2008-06-1360 ppb4039 to 81 ppb
2008-06-12160.5 ppb40151 to 170 ppb
2008-06-1134 ppb6021 to 54 ppb
2008-06-10239.6 ppb10047 to 473 ppb
2008-06-0999.67 ppb18030 to 138 ppb
2008-06-0896.5 ppb4063 to 130 ppb
2008-06-0790 ppb6048 to 124 ppb
2008-06-06106.33 ppb24033 to 223 ppb
2008-04-074.8 ppb401.6 to 8 ppb
2007-10-087.4 ppb401.8 to 13 ppb
2007-04-093.2 ppb401.5 to 4.9 ppb
2006-10-170 ppb220 ppb
2006-04-180 ppb220 ppb
2005-09-1470 ppb1070 ppb
2005-09-13120 ppb10120 ppb
2005-08-23230 ppb10230 ppb
2005-08-1810 ppb1010 ppb
2005-08-1620 ppb1020 ppb
2005-08-1570 ppb1070 ppb
2005-08-1130 ppb1030 ppb
2005-08-1062 ppb5030 to 110 ppb
2005-08-0970 ppb1070 ppb
2005-08-0830 ppb1030 ppb
2005-08-0520 ppb1020 ppb
2005-08-0335 ppb4020 to 50 ppb
2005-08-02190 ppb10190 ppb
2005-08-0150 ppb2030 to 70 ppb
2005-07-3155 ppb2050 to 60 ppb
2005-07-3010 ppb1010 ppb
2005-07-2947.14 ppb7010 to 100 ppb
2005-07-2865.71 ppb7020 to 150 ppb
2005-07-2762 ppb10010 to 210 ppb
2005-07-2665.71 ppb7010 to 160 ppb
2005-07-2542.5 ppb410 to 120 ppb
2004-10-120 ppb220 ppb
2004-04-140 ppb220 ppb