The Power of Information

National Drinking Water Database

Village of Bancroft Utilities - Bancroft, NE

Serves 500 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
18 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)
5 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
20 days
Tests ConductedNumber of individual tests done for this contaminant
91 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.782.54 ppb
1387.25 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
2008-05-07807 ppb20807 ppb
2008-05-06448 ppb40225 to 671 ppb
2008-05-05763.33 ppb120319 to 1650 ppb
2008-05-04575 ppb20575 ppb
2008-03-10774 ppb40704 to 844 ppb
2008-03-09964 ppb20964 ppb
2008-03-08882 ppb40866 to 898 ppb
2008-03-07839 ppb20839 ppb
2008-03-06693 ppb20693 ppb
2008-03-04520.33 ppb60240 to 910 ppb
2008-02-011140 ppb201140 ppb
2008-01-301127.5 ppb40875 to 1380 ppb
2008-01-29925.67 ppb120587 to 1980 ppb
2007-06-07788 ppb20788 ppb
2007-06-061387.25 ppb80889 to 2220 ppb
2007-06-051032.2 ppb100557 to 2040 ppb
2006-07-171160 ppb201160 ppb
2006-07-12824.5 ppb80383 to 1890 ppb
2006-04-120 ppb220 ppb
2004-07-270 ppb110 ppb