The Power of Information

National Drinking Water Database


Sioux City Water Supply Utilities - Sioux City, IA


Serves 85,028 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
14 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
17 days
Tests ConductedNumber of individual tests done for this contaminant
61 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.2.02 ppb
8.67 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
2007-09-251 ppb101 ppb
2007-09-153 ppb201 to 5 ppb
2007-09-078.67 ppb310 to 19 ppb
2007-07-203 ppb103 ppb
2007-07-191 ppb101 ppb
2007-07-130.67 ppb320 to 2 ppb
2007-07-121 ppb210 to 2 ppb
2007-07-110.87 ppb1580 to 3 ppb
2007-06-270 ppb110 ppb
2007-06-162 ppb102 ppb
2004-08-090.17 ppb650 to 1 ppb
2004-08-084 ppb104 ppb
2004-08-050.5 ppb210 to 1 ppb
2004-08-040 ppb880 ppb
2004-08-030.91 ppb1180 to 4 ppb
2004-08-027.5 ppb202 to 13 ppb
2004-07-140 ppb110 ppb