The Power of Information

National Drinking Water Database

Story City Water Dept Utilities - Ames, IA

Serves 3,228 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
1 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
77 days
Tests ConductedNumber of individual tests done for this contaminant
220 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.72.96 ppb
440 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
2009-05-010 ppb110 ppb
2009-04-30107 ppb1050 to 280 ppb
2009-04-2966.67 ppb960 to 300 ppb
2008-12-19150 ppb20100 to 200 ppb
2008-12-1832.86 ppb750 to 120 ppb
2008-12-17115 ppb20100 to 130 ppb
2008-12-1661.11 ppb950 to 200 ppb
2008-05-130 ppb220 ppb
2008-05-0964 ppb420 to 132 ppb
2008-05-080 ppb110 ppb
2008-05-0740 ppb320 to 120 ppb
2008-05-0659.9 ppb1050 to 159 ppb
2007-12-1160 ppb210 to 120 ppb
2007-12-07110 ppb10110 ppb
2007-12-06165 ppb20160 to 170 ppb
2007-12-050 ppb110 ppb
2007-12-030 ppb110 ppb
2007-12-01145 ppb20140 to 150 ppb
2007-11-30110 ppb1130 to 230 ppb
2007-05-110 ppb110 ppb
2007-05-10130 ppb10130 ppb
2007-05-09130 ppb310 to 210 ppb
2007-05-0665 ppb210 to 130 ppb
2007-05-0578 ppb520 to 160 ppb
2007-05-04100 ppb720 to 160 ppb
2007-05-030 ppb110 ppb
2006-12-060 pCi/L*110 ppb
2006-12-06120 ppb10120 ppb
2006-12-05440 ppb10440 ppb
2006-12-04130 ppb10130 ppb
2006-12-040 pCi/L*110 ppb
2006-12-02100 ppb10100 ppb
2006-12-010 pCi/L*110 ppb
2006-11-300 pCi/L*110 ppb
2006-11-290 pCi/L*110 ppb
2006-11-29152.5 ppb40130 to 180 ppb
2006-11-280 pCi/L*440 ppb
2006-11-28165 ppb20160 to 170 ppb
2006-11-270 pCi/L*110 ppb
2006-06-05190 ppb10190 ppb
2006-06-020 pCi/L*220 ppb
2006-06-02160 ppb10160 ppb
2006-06-01120 ppb10120 ppb
2006-05-30240 ppb10240 ppb
2006-05-26170 ppb10170 ppb
2006-05-260 pCi/L*110 ppb
2006-05-25150 ppb10150 ppb
2006-05-24155 ppb20140 to 170 ppb
2006-05-23148 ppb50100 to 180 ppb
2006-05-230 pCi/L*220 ppb
2006-05-220 pCi/L*110 ppb
2006-05-22170 ppb10170 ppb
2005-11-160 ppb110 ppb
2005-11-100 ppb110 ppb
2005-11-04110 ppb10110 ppb
2005-11-03205 ppb20140 to 270 ppb
2005-11-0290 ppb630 to 250 ppb
2005-11-01155 ppb810 to 290 ppb
2005-10-31190 ppb10190 ppb
2005-03-310 ppb110 ppb
2005-03-290 ppb110 ppb
2005-03-240 ppb330 ppb
2005-03-23117.14 ppb710 to 170 ppb
2005-03-2257.5 ppb850 to 210 ppb
2004-11-090 ppb110 ppb
2004-11-070 ppb110 ppb
2004-11-050 ppb220 ppb
2004-11-040 ppb220 ppb
2004-11-0391.43 ppb730 to 220 ppb
2004-11-020 ppb440 ppb
2004-11-010 ppb330 ppb
2004-05-100 ppb110 ppb
2004-05-070 ppb110 ppb
2004-05-060 ppb220 ppb
2004-05-0522 ppb540 to 110 ppb
2004-05-0470 ppb840 to 170 ppb
2004-05-03110 ppb310 to 170 ppb