The Power of Information

National Drinking Water Database

Bonney Lake Water Department, City Utilities - Tacoma, WA

Serves 30,920 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
21 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)
1 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
26 days
Tests ConductedNumber of individual tests done for this contaminant
130 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.530.04 ppb
1275 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
2006-09-1515 ppb420 to 40 ppb
2006-06-16430 ppb10430 ppb
2006-06-15473.33 ppb6070 to 800 ppb
2006-06-14717.5 ppb2010 to 1500 ppb
2006-06-13824.55 ppb1110 to 1400 ppb
2006-06-09668 ppb50460 to 980 ppb
2006-06-08618.75 ppb16040 to 1300 ppb
2006-06-07355 ppb20120 to 590 ppb
2005-12-1230 ppb1030 ppb
2005-12-09590 ppb40190 to 960 ppb
2005-12-081275 ppb201050 to 1500 ppb
2005-12-07604.17 ppb120190 to 1340 ppb
2005-12-06874 ppb50500 to 1600 ppb
2005-12-05780 ppb20760 to 800 ppb
2005-12-04800 ppb20650 to 950 ppb
2005-12-03785 ppb20570 to 1000 ppb
2005-12-02577 ppb10030 to 1120 ppb
2005-12-01340 ppb10340 ppb
2005-11-30527.5 ppb40470 to 630 ppb
2005-11-29740 ppb10740 ppb
2005-11-23490 ppb610 to 1000 ppb
2005-11-22780 ppb10780 ppb
2005-10-21472.86 ppb7060 to 1030 ppb
2005-06-230 ppb110 ppb
2005-06-0613.33 ppb320 to 40 ppb
2004-02-230 ppb110 ppb