The Power of Information

National Drinking Water Database

United Water New Jersey Utilities - Mahwah, NJ

Serves 773,458 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
2 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
33 days
Tests ConductedNumber of individual tests done for this contaminant
67 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.62.35 ppb
455 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
2006-09-2722 ppb1022 ppb
2006-09-2626 ppb1026 ppb
2006-09-2580.25 ppb4022 to 130 ppb
2006-09-2462 ppb1062 ppb
2006-09-2327 ppb1027 ppb
2006-09-2223 ppb6011 to 30 ppb
2006-09-2131 ppb2022 to 40 ppb
2006-09-18120 ppb10120 ppb
2006-09-1447.67 ppb3015 to 95 ppb
2006-09-1353.33 ppb3045 to 60 ppb
2006-09-11120 ppb3046 to 250 ppb
2006-09-1055 ppb1055 ppb
2006-09-0944.5 ppb2034 to 55 ppb
2006-09-08330 ppb10330 ppb
2006-09-0761 ppb1061 ppb
2006-09-0641 ppb1041 ppb
2006-09-0419 ppb1019 ppb
2006-09-015 ppb105 ppb
2006-08-3135 ppb1035 ppb
2006-08-3032.2 ppb5017 to 63 ppb
2006-08-2962 ppb3033 to 110 ppb
2006-08-2839.5 ppb2028 to 51 ppb
2006-08-2742.67 ppb3022 to 79 ppb
2006-08-2628 ppb2015 to 41 ppb
2006-08-25455 ppb20310 to 600 ppb
2006-08-2478.25 ppb4062 to 100 ppb
2006-08-2311 ppb208 to 14 ppb
2006-08-2230.25 ppb4021 to 37 ppb
2006-08-2145 ppb1045 ppb
2006-08-1921 ppb1021 ppb
2005-07-150 ppb110 ppb
2005-07-140 ppb110 ppb
2004-07-2210 ppb1010 ppb