The Power of Information

National Drinking Water Database

Kentucky-American Water Utilities - Lexington, KY

Serves 354,473 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
26 days
Tests ConductedNumber of individual tests done for this contaminant
61 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.60.31 ppb
220 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
2008-02-120 ppb440 ppb
2007-02-050 ppb440 ppb
2006-09-0820 ppb1020 ppb
2006-09-0743.33 ppb3010 to 90 ppb
2006-08-3030 ppb1030 ppb
2006-08-2945 ppb4010 to 90 ppb
2006-08-24123.33 ppb3030 to 290 ppb
2006-08-2264 ppb5030 to 120 ppb
2006-08-2190 ppb1090 ppb
2006-08-1520 ppb3010 to 30 ppb
2006-08-1050 ppb1050 ppb
2006-08-0840 ppb1040 ppb
2006-07-2525 ppb2020 to 30 ppb
2006-07-1835 ppb4010 to 60 ppb
2006-07-1130 ppb2020 to 40 ppb
2006-07-0620 ppb1020 ppb
2006-06-29200 ppb10200 ppb
2006-06-2725 ppb2020 to 30 ppb
2006-06-21120 ppb5030 to 440 ppb
2006-06-20220 ppb10220 ppb
2006-06-1810 ppb1010 ppb
2006-06-14160 ppb10160 ppb
2006-06-1397.5 ppb4030 to 180 ppb
2006-06-06100 ppb3070 to 140 ppb
2006-02-140 ppb220 ppb
2004-02-230 ppb110 ppb