The Power of Information

National Drinking Water Database

City of Phoenix Water Services Department Utilities - Phoenix, AZ

Serves 1,200,000 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
5 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
60 days
Tests ConductedNumber of individual tests done for this contaminant
174 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.135.41 ppb
996 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
2006-09-290 ppb220 ppb
2006-09-280 ppb550 ppb
2006-09-270 ppb770 ppb
2006-09-260 ppb660 ppb
2006-09-250 ppb220 ppb
2006-09-230 ppb330 ppb
2006-09-220 ppb440 ppb
2006-09-210 ppb770 ppb
2006-09-200 ppb440 ppb
2006-09-190 ppb660 ppb
2006-09-180 ppb550 ppb
2006-09-160 ppb220 ppb
2006-09-150 ppb880 ppb
2005-10-10307 ppb10307 ppb
2005-09-2764.6 ppb1064.6 ppb
2005-09-26264 ppb10264 ppb
2005-09-22226 ppb10226 ppb
2005-09-21224 ppb10224 ppb
2005-09-15201 ppb10201 ppb
2005-09-1386.3 ppb1086.3 ppb
2005-09-12150 ppb20122 to 178 ppb
2005-09-1166.9 ppb2049.6 to 84.2 ppb
2005-09-09173 ppb10173 ppb
2005-09-08444 ppb20251 to 637 ppb
2005-09-07118 ppb10118 ppb
2005-09-0679.87 ppb3030.6 to 132 ppb
2005-09-0584.9 ppb1084.9 ppb
2005-09-01116.7 ppb2050.4 to 183 ppb
2005-08-31173 ppb10173 ppb
2005-08-3057.13 ppb4039.5 to 72.8 ppb
2005-08-29120.15 ppb4039.8 to 272 ppb
2005-08-26224.9 ppb6012.3 to 1020 ppb
2005-08-25161.33 ppb3081 to 255 ppb
2005-08-2488.7 ppb6021 to 135 ppb
2005-08-23149.54 ppb12018.1 to 700 ppb
2004-09-19120 ppb2091 to 149 ppb
2004-09-1620.3 ppb1020.3 ppb
2004-09-10192.7 ppb3052.1 to 352 ppb
2004-09-09273 ppb10273 ppb
2004-09-0812 ppb1012 ppb
2004-09-07335 ppb30163 to 670 ppb
2004-09-03130 ppb10130 ppb
2004-08-30130.77 ppb3067.8 to 232 ppb
2004-08-28161 ppb10161 ppb
2004-08-24996 ppb10996 ppb
2004-08-2377.95 ppb2032.9 to 123 ppb
2004-08-2194.9 ppb1094.9 ppb
2004-08-2035.4 ppb1035.4 ppb
2004-08-18188 ppb10188 ppb
2004-08-06200 ppb10200 ppb
2004-08-05370 ppb10370 ppb
2004-08-0273.5 ppb1073.5 ppb
2004-07-30223.88 ppb4043.5 to 444 ppb
2004-07-29149.97 ppb3019.9 to 270 ppb
2004-07-28184.05 ppb4079.2 to 246 ppb
2004-07-2788.23 ppb720 to 193 ppb
2004-07-26193.43 ppb9024.3 to 1100 ppb
2004-07-25130.5 ppb20110 to 151 ppb
2004-07-2444.2 ppb1044.2 ppb
2004-07-23119 ppb10119 ppb