The Power of Information

National Drinking Water Database


Seattle Public Utilities Utilities - Seattle, WA


Serves 629,000 people

Lead (total)

Lead is a metal that enters water by corrosion of household plumbing systems, discharge of industrial pollution and erosion of natural deposits.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
142 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
176 days
Tests ConductedNumber of individual tests done for this contaminant
1,405 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
Lead (total)Lead is a metal that enters water by corrosion of household plumbing systems, discharge of industrial pollution and erosion of natural deposits.2.81 ppb
27.3 ppb
Yes
MCLGA 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.: 0 ppb
No
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 Lead (total)

Health Based Limits for Lead (total)

StandardDescriptionLevel
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.0 ppb
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.0.2 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2006-09-140 ppb330 ppb
2006-08-311.9 ppb1890 to 7 ppb
2006-08-290 ppb110 ppb
2006-08-281.83 ppb320 to 5.5 ppb
2006-08-251.65 ppb210 to 3.3 ppb
2006-08-241.79 ppb16110 to 13.4 ppb
2006-08-210 ppb110 ppb
2006-08-183.6 ppb320 to 10.8 ppb
2006-08-171.47 ppb1590 to 6.4 ppb
2006-08-164.85 ppb420 to 14.7 ppb
2006-08-152.15 ppb1180 to 12 ppb
2006-08-144.36 ppb2580 to 18.9 ppb
2006-08-137.48 ppb840 to 42 ppb
2006-08-114.12 ppb520 to 12.6 ppb
2006-08-100 ppb110 ppb
2006-08-093.53 ppb640 to 16.9 ppb
2006-08-082.06 ppb760 to 14.4 ppb
2006-08-045.73 ppb420 to 12.8 ppb
2006-08-0310.28 ppb1140 to 59.7 ppb
2006-08-022.29 ppb1160 to 14.2 ppb
2006-08-010 ppb110 ppb
2006-07-280 ppb330 ppb
2006-07-260 ppb220 ppb
2006-07-210 ppb220 ppb
2006-07-201.41 ppb22140 to 6.7 ppb
2006-07-193.56 ppb710 to 9.1 ppb
2006-07-181.35 ppb1490 to 6.3 ppb
2006-06-060 ppb220 ppb
2005-10-294.9 ppb104.9 ppb
2005-10-280 ppb110 ppb
2005-10-260 ppb110 ppb
2005-10-202.9 ppb102.9 ppb
2005-10-190.73 ppb320 to 2.2 ppb
2005-10-184 ppb104 ppb
2005-10-163.5 ppb103.5 ppb
2005-10-140 ppb330 ppb
2005-10-131.21 ppb980 to 10.9 ppb
2005-10-120.86 ppb750 to 3.2 ppb
2005-10-112.83 ppb1770 to 12.2 ppb
2005-10-100 ppb110 ppb
2005-10-072.72 ppb610 to 4.7 ppb
2005-10-062.5 ppb32170 to 17.4 ppb
2005-10-051.56 ppb14100 to 11.9 ppb
2005-10-042.89 ppb1980 to 17.2 ppb
2005-10-036.2 ppb106.2 ppb
2005-09-303.13 ppb630 to 10 ppb
2005-09-290.8 ppb14110 to 4.7 ppb
2005-09-284.08 ppb1560 to 15.4 ppb
2005-09-274.57 ppb23100 to 22.4 ppb
2005-09-263.7 ppb310 to 8.4 ppb
2005-09-231.1 ppb320 to 3.3 ppb
2005-09-224.3 ppb1150 to 25.1 ppb
2005-09-212.96 ppb1050 to 18.4 ppb
2005-09-204.96 ppb1670 to 16.7 ppb
2005-09-167.98 ppb610 to 20.3 ppb
2005-09-150 ppb220 ppb
2005-09-142.93 ppb850 to 14.2 ppb
2005-09-134.26 ppb1450 to 19 ppb
2005-09-093.52 ppb610 to 7 ppb
2005-09-082 ppb26140 to 10 ppb
2005-09-070.56 ppb760 to 3.9 ppb
2005-09-060 ppb110 ppb
2005-09-023.4 ppb210 to 6.8 ppb
2005-09-011.7 ppb210 to 3.4 ppb
2005-08-310.81 ppb14110 to 6.8 ppb
2005-08-301.77 ppb1460 to 6.1 ppb
2005-08-263.7 ppb103.7 ppb
2005-08-251.35 ppb1060 to 4.6 ppb
2005-08-241.55 ppb210 to 3.1 ppb
2005-08-235.68 ppb501.6 to 11.4 ppb
2005-08-221.76 ppb1460 to 7.5 ppb
2005-08-190 ppb110 ppb
2005-08-181.73 ppb1370 to 8.6 ppb
2005-08-170 ppb660 ppb
2005-08-161.62 ppb1160 to 5.9 ppb
2005-08-152.6 ppb102.6 ppb
2005-08-120 ppb110 ppb
2005-08-112.3 ppb102.3 ppb
2005-08-100 ppb770 ppb
2005-08-090.8 ppb1290 to 4.2 ppb
2005-05-100 ppb220 ppb
2005-04-295.05 ppb210 to 10.1 ppb
2005-04-281.4 ppb420 to 3.5 ppb
2005-04-277.74 ppb520 to 32.1 ppb
2005-04-263.41 ppb1370 to 13.7 ppb
2005-04-222.35 ppb202.2 to 2.5 ppb
2005-04-212.22 ppb1690 to 8.4 ppb
2005-04-202.15 ppb640 to 8.3 ppb
2005-04-191.65 ppb22140 to 12.6 ppb
2005-04-1827.3 ppb1027.3 ppb
2005-04-150.5 ppb430 to 2 ppb
2005-04-141.37 ppb740 to 4 ppb
2005-04-133.5 ppb740 to 19.7 ppb
2005-04-125.56 ppb37120 to 61.2 ppb
2005-04-116 ppb106 ppb
2005-04-083.45 ppb210 to 6.9 ppb
2005-04-073.02 ppb1370 to 17 ppb
2005-04-064.14 ppb1680 to 24.1 ppb
2005-04-058.37 ppb30130 to 43 ppb
2005-03-312.02 ppb1380 to 8.5 ppb
2005-03-308.11 ppb850 to 30.2 ppb
2005-03-296.95 ppb1250 to 21.1 ppb
2005-03-253.7 ppb103.7 ppb
2005-03-245.18 ppb1110 to 12.3 ppb
2005-03-234.42 ppb910 to 14.8 ppb
2005-03-222.88 ppb630 to 7.5 ppb
2005-03-173.54 ppb1770 to 11.2 ppb
2005-03-162.76 ppb830 to 10.6 ppb
2005-03-152.26 ppb830 to 6.8 ppb
2005-03-140 ppb220 ppb
2005-03-135.1 ppb105.1 ppb
2005-03-112.02 ppb630 to 5.6 ppb
2005-03-101.48 ppb1690 to 5 ppb
2005-03-092.7 ppb210 to 5.4 ppb
2005-03-081.69 ppb1070 to 7.1 ppb
2005-03-070 ppb110 ppb
2005-03-031.08 ppb530 to 3.3 ppb
2005-03-021.52 ppb18110 to 8.5 ppb
2005-03-012.14 ppb20140 to 11.8 ppb
2005-02-240 ppb220 ppb
2005-02-232.15 ppb22140 to 11.2 ppb
2005-02-170.5 ppb540 to 2.5 ppb
2005-02-160 ppb110 ppb
2005-02-150.62 ppb19150 to 3.1 ppb
2004-06-231.9 ppb210 to 3.8 ppb
2004-06-212.1 ppb102.1 ppb
2004-06-091.4 ppb210 to 2.8 ppb
2004-06-040.46 ppb540 to 2.3 ppb
2004-06-030 ppb440 ppb
2004-06-020 ppb220 ppb
2004-05-276.03 ppb650 to 36.2 ppb
2004-05-241.25 ppb210 to 2.5 ppb
2004-05-210 ppb110 ppb
2004-05-202.98 ppb420 to 6.5 ppb
2004-05-142.49 ppb1060 to 12.1 ppb
2004-05-133.74 ppb520 to 9.1 ppb
2004-05-060 ppb440 ppb
2004-05-053.23 ppb410 to 6.7 ppb
2004-05-040 ppb330 ppb
2004-05-033.6 ppb203.3 to 3.9 ppb
2004-04-300.05 ppb210 to 0.1 ppb
2004-04-295.73 ppb29120 to 34.1 ppb
2004-04-270 ppb220 ppb
2004-04-235 ppb830 to 16.8 ppb
2004-04-223.17 ppb1350 to 11.7 ppb
2004-04-215.73 ppb1240 to 16 ppb
2004-04-202.31 ppb1150 to 7.3 ppb
2004-04-166.1 ppb106.1 ppb
2004-04-154.42 ppb1890 to 29.4 ppb
2004-04-144.28 ppb1270 to 31.7 ppb
2004-04-139.08 ppb1240 to 29.5 ppb
2004-04-094.3 ppb104.3 ppb
2004-04-084.89 ppb1240 to 26.8 ppb
2004-04-077.53 ppb310 to 19.7 ppb
2004-04-064.5 ppb1240 to 20.6 ppb
2004-04-050 ppb220 ppb
2004-04-025.9 ppb105.9 ppb
2004-04-014.16 ppb27100 to 14.9 ppb
2004-03-312.23 ppb630 to 6.5 ppb
2004-03-306.42 ppb520 to 24.8 ppb
2004-03-295.8 ppb303.7 to 8.7 ppb
2004-03-250 ppb220 ppb
2004-03-243.24 ppb2090 to 13.5 ppb
2004-03-235 ppb41210 to 39 ppb
2004-03-223.15 ppb210 to 6.3 ppb
2004-03-210 ppb110 ppb
2004-03-193.4 ppb430 to 13.6 ppb
2004-03-181.93 ppb1460 to 6.8 ppb
2004-03-173.45 ppb1350 to 16.5 ppb
2004-03-121.07 ppb320 to 3.2 ppb
2004-03-113.27 ppb302.5 to 3.9 ppb
2004-03-104.19 ppb920 to 13.7 ppb
2004-03-040 ppb220 ppb
2004-03-031.61 ppb1370 to 6.6 ppb
2004-02-242.8 ppb102.8 ppb
2004-01-134 ppb104 ppb