The Power of Information

National Drinking Water Database


Seattle Public Utilities Utilities - Seattle, WA


Serves 629,000 people

Copper

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
1 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
175 days
Tests ConductedNumber of individual tests done for this contaminant
1,406 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

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.98.31 ppb
302 ppb
Yes
300 ppb
No
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

StandardDescriptionLevel
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
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2006-09-1493.33 ppb3027 to 173 ppb
2006-08-3160.67 ppb1810 to 189 ppb
2006-08-2928 ppb1028 ppb
2006-08-2854 ppb3023 to 105 ppb
2006-08-25141.5 ppb2087 to 196 ppb
2006-08-2480.56 ppb1610 to 161 ppb
2006-08-2135 ppb1035 ppb
2006-08-1871.67 ppb3051 to 94 ppb
2006-08-1792.4 ppb15022 to 447 ppb
2006-08-16103.5 ppb4043 to 164 ppb
2006-08-1569.82 ppb1130 to 153 ppb
2006-08-1472.08 ppb2520 to 176 ppb
2006-08-13104.38 ppb810 to 229 ppb
2006-08-1162.4 ppb5030 to 85 ppb
2006-08-1093 ppb1093 ppb
2006-08-0988.67 ppb620 to 248 ppb
2006-08-08142 ppb7032 to 296 ppb
2006-08-0492.25 ppb4038 to 177 ppb
2006-08-03116 ppb11038 to 285 ppb
2006-08-02143.82 ppb11057 to 288 ppb
2006-08-0122 ppb1022 ppb
2006-07-2833.67 ppb310 to 64 ppb
2006-07-2669 ppb2068 to 70 ppb
2006-07-2128 ppb2025 to 31 ppb
2006-07-2043.09 ppb2250 to 124 ppb
2006-07-1972.43 ppb710 to 167 ppb
2006-07-1880.57 ppb1410 to 211 ppb
2006-06-065.85 ppb203.4 to 8.3 ppb
2005-10-2963 ppb1063 ppb
2005-10-2834 ppb1034 ppb
2005-10-2675 ppb1075 ppb
2005-10-2050 ppb1050 ppb
2005-10-1975.67 ppb3028 to 135 ppb
2005-10-1882 ppb1082 ppb
2005-10-1691 ppb1091 ppb
2005-10-1462.67 ppb3022 to 92 ppb
2005-10-1335.67 ppb920 to 101 ppb
2005-10-1264.29 ppb710 to 95 ppb
2005-10-1181.65 ppb1710 to 195 ppb
2005-10-10102 ppb10102 ppb
2005-10-0761.67 ppb6038 to 112 ppb
2005-10-0672.03 ppb3230 to 307 ppb
2005-10-0561.93 ppb1410 to 163 ppb
2005-10-0477.95 ppb1920 to 214 ppb
2005-10-0372 ppb1072 ppb
2005-09-3068.67 ppb6024 to 123 ppb
2005-09-2961.64 ppb14026 to 134 ppb
2005-09-2894.07 ppb15021 to 272 ppb
2005-09-2785.48 ppb2320 to 258 ppb
2005-09-26123 ppb3069 to 165 ppb
2005-09-2369 ppb3051 to 104 ppb
2005-09-2260.09 ppb1110 to 128 ppb
2005-09-2174.5 ppb10020 to 226 ppb
2005-09-20122.81 ppb16043 to 251 ppb
2005-09-16111.67 ppb610 to 189 ppb
2005-09-15146.5 ppb20107 to 186 ppb
2005-09-14163 ppb8048 to 244 ppb
2005-09-13111.5 ppb14064 to 228 ppb
2005-09-09128.83 ppb6061 to 214 ppb
2005-09-0886.31 ppb2620 to 240 ppb
2005-09-0788.57 ppb7020 to 209 ppb
2005-09-06116 ppb10116 ppb
2005-09-0282 ppb2067 to 97 ppb
2005-09-0155.5 ppb2023 to 88 ppb
2005-08-3170.5 ppb14025 to 228 ppb
2005-08-3072.5 ppb14033 to 148 ppb
2005-08-260 ppb110 ppb
2005-08-2553.7 ppb10024 to 123 ppb
2005-08-2445 ppb2035 to 55 ppb
2005-08-23109.8 ppb510 to 216 ppb
2005-08-2240.14 ppb1460 to 138 ppb
2005-08-1930 ppb1030 ppb
2005-08-1842.62 ppb1310 to 67 ppb
2005-08-1761.83 ppb610 to 163 ppb
2005-08-1650.91 ppb1110 to 135 ppb
2005-08-1547 ppb1047 ppb
2005-08-1239 ppb1039 ppb
2005-08-1182 ppb1082 ppb
2005-08-1038 ppb710 to 65 ppb
2005-08-0952.75 ppb12020 to 142 ppb
2005-05-102.65 ppb201.3 to 4 ppb
2005-04-29188.5 ppb20102 to 275 ppb
2005-04-2898 ppb410 to 191 ppb
2005-04-27201.6 ppb5020 to 344 ppb
2005-04-26151 ppb13032 to 288 ppb
2005-04-22113.5 ppb2095 to 132 ppb
2005-04-2172.75 ppb1610 to 151 ppb
2005-04-20115 ppb6034 to 220 ppb
2005-04-19118.77 ppb2210 to 301 ppb
2005-04-18302 ppb10302 ppb
2005-04-1583.5 ppb4024 to 145 ppb
2005-04-1481.38 ppb8035 to 141 ppb
2005-04-13134 ppb7024 to 302 ppb
2005-04-12144.76 ppb37023 to 377 ppb
2005-04-1163 ppb1063 ppb
2005-04-0888 ppb2079 to 97 ppb
2005-04-07167.23 ppb13020 to 388 ppb
2005-04-06137.69 ppb1620 to 328 ppb
2005-04-05141.17 ppb3010 to 377 ppb
2005-03-31114.31 ppb13024 to 305 ppb
2005-03-30161.11 ppb9062 to 286 ppb
2005-03-29187.5 ppb12065 to 331 ppb
2005-03-25217 ppb10217 ppb
2005-03-2482.27 ppb11026 to 253 ppb
2005-03-23229.22 ppb90129 to 339 ppb
2005-03-22279.33 ppb60218 to 314 ppb
2005-03-17197.65 ppb17060 to 516 ppb
2005-03-16214.63 ppb8054 to 411 ppb
2005-03-15206.63 ppb80108 to 331 ppb
2005-03-14128.5 ppb2026 to 231 ppb
2005-03-13103 ppb10103 ppb
2005-03-1174.67 ppb620 to 216 ppb
2005-03-1073.56 ppb1610 to 181 ppb
2005-03-09150.5 ppb20121 to 180 ppb
2005-03-08131.5 ppb10044 to 354 ppb
2005-03-07101 ppb10101 ppb
2005-03-0394.4 ppb5039 to 199 ppb
2005-03-0282 ppb1810 to 154 ppb
2005-03-0159.3 ppb2070 to 209 ppb
2005-02-2468 ppb210 to 136 ppb
2005-02-2378.73 ppb2220 to 260 ppb
2005-02-1766.2 ppb5045 to 101 ppb
2005-02-1654 ppb1054 ppb
2005-02-1566.21 ppb1940 to 203 ppb
2004-06-2380 ppb2030 to 130 ppb
2004-06-2196 ppb1096 ppb
2004-06-0919.5 ppb210 to 39 ppb
2004-06-0457.6 ppb5026 to 109 ppb
2004-06-0339.25 ppb4034 to 44 ppb
2004-06-02110 ppb2042 to 178 ppb
2004-05-2742.67 ppb610 to 93 ppb
2004-05-2461 ppb2033 to 89 ppb
2004-05-2130 ppb1030 ppb
2004-05-20113 ppb4039 to 203 ppb
2004-05-1474.7 ppb1010 to 271 ppb
2004-05-1392 ppb5024 to 152 ppb
2004-05-06107.75 ppb4035 to 178 ppb
2004-05-0588.5 ppb4027 to 203 ppb
2004-05-042.73 ppb310 to 7 ppb
2004-05-03159 ppb2050 to 268 ppb
2004-04-30128 ppb2055 to 201 ppb
2004-04-29126.34 ppb2960 to 507 ppb
2004-04-2745.5 ppb2026 to 65 ppb
2004-04-23138.88 ppb8045 to 283 ppb
2004-04-2295.08 ppb13028 to 198 ppb
2004-04-21102.58 ppb12020 to 217 ppb
2004-04-20119.45 ppb11020 to 263 ppb
2004-04-1672 ppb1072 ppb
2004-04-15192.78 ppb1810 to 494 ppb
2004-04-14112.67 ppb12028 to 256 ppb
2004-04-13177.42 ppb12091 to 317 ppb
2004-04-09122 ppb10122 ppb
2004-04-0849 ppb12022 to 80 ppb
2004-04-0792 ppb3085 to 99 ppb
2004-04-06142.08 ppb12034 to 302 ppb
2004-04-05150.5 ppb2041 to 260 ppb
2004-04-0289 ppb1089 ppb
2004-04-01191.89 ppb2710 to 513 ppb
2004-03-31274.33 ppb60170 to 369 ppb
2004-03-30222.2 ppb50145 to 330 ppb
2004-03-29254.67 ppb30228 to 306 ppb
2004-03-2531 ppb210 to 62 ppb
2004-03-24207.1 ppb20024 to 497 ppb
2004-03-23149 ppb41036 to 353 ppb
2004-03-22127.5 ppb2068 to 187 ppb
2004-03-21201 ppb10201 ppb
2004-03-19115.75 ppb4052 to 179 ppb
2004-03-1894.64 ppb1410 to 173 ppb
2004-03-1781.77 ppb1310 to 157 ppb
2004-03-1257 ppb3042 to 86 ppb
2004-03-11139.33 ppb3094 to 168 ppb
2004-03-10118 ppb9053 to 230 ppb
2004-03-0449.5 ppb210 to 99 ppb
2004-03-0344 ppb13028 to 72 ppb
2004-02-24144 ppb10144 ppb