The Power of Information

National Drinking Water Database

Edwards Afb - Main Base Utilities - Bakersfield, CA

Serves 14,913 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
25 days
Tests ConductedNumber of individual tests done for this contaminant
193 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.19.84 ppb
120.95 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
2009-01-280 ppb330 ppb
2008-01-0813.61 ppb750 to 69 ppb
2007-01-18105 ppb10105 ppb
2007-01-100 ppb660 ppb
2006-01-090 ppb770 ppb
2005-07-130 ppb770 ppb
2005-07-120 ppb660 ppb
2005-07-1144.21 ppb1060 to 132 ppb
2005-04-200 ppb770 ppb
2005-04-1151.25 ppb16110 to 232 ppb
2005-01-310 ppb550 ppb
2005-01-2519.63 ppb870 to 157 ppb
2005-01-24120.95 ppb1050 to 581 ppb
2004-10-190 ppb880 ppb
2004-10-1335.94 ppb1070 to 249 ppb
2004-10-127.21 ppb760 to 50.5 ppb
2004-07-2014.03 ppb430 to 56.1 ppb
2004-07-196.18 ppb13120 to 80.3 ppb
2004-07-130 ppb440 ppb
2004-07-1217.98 ppb430 to 71.9 ppb
2004-04-260 ppb440 ppb
2004-04-190 ppb14140 ppb
2004-04-1444.42 ppb640 to 181 ppb
2004-01-2615.59 ppb13110 to 116 ppb
2004-01-120 ppb13130 ppb