The Power of Information

National Drinking Water Database

Joliet Utilities - Joliet, IL

Serves 145,000 people

Combined Uranium (pCi/L)

Uranium is a radioactive element commonly found in most rocks; processed ore is used for power generation and weapons manufacture.
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
0 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
34 days
Tests ConductedNumber of individual tests done for this contaminant
247 tests

Testing Summary

Health Limit
Legal Limit

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
Combined Uranium (pCi/L)Uranium is a radioactive element commonly found in most rocks; processed ore is used for power generation and weapons manufacture.2.13 pCi/L
4.5 pCi/L
15 pCi/L
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 Combined Uranium (pCi/L)

Health Based Limits for Combined Uranium (pCi/L)

Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.15 pCi/L

Testing Results

Testing DateAverage
Samples taken that dayNumber of Non-DetectsRange of Results
2009-01-272.6 pCi/L900.8 to 4.8 pCi/L
2009-01-263 pCi/L103 pCi/L
2008-08-132 pCi/L201.9 to 2.1 pCi/L
2008-08-122.64 pCi/L800.5 to 4.8 pCi/L
2008-05-122.16 pCi/L900.5 to 4.2 pCi/L
2008-02-190.93 pCi/L400.3 to 1.5 pCi/L
2008-02-181.65 pCi/L201.4 to 1.9 pCi/L
2008-02-112.4 pCi/L102.4 pCi/L
2008-02-102.3 pCi/L102.3 pCi/L
2008-02-083.2 pCi/L103.2 pCi/L
2008-02-071.45 pCi/L200.9 to 2 pCi/L
2007-10-112 pCi/L1201 to 4 pCi/L
2007-10-103 pCi/L103 pCi/L
2007-07-181.63 pCi/L810 to 4 pCi/L
2007-07-172 pCi/L501 to 3 pCi/L
2007-04-122.64 pCi/L1110 to 5 pCi/L
2007-04-114.5 pCi/L204 to 5 pCi/L
2007-02-141.86 pCi/L710 to 3 pCi/L
2007-02-122.83 pCi/L601 to 5 pCi/L
2006-11-172.1 pCi/L1200.5 to 3.4 pCi/L
2006-07-191.91 pCi/L1300.7 to 4.1 pCi/L
2006-04-242.02 pCi/L1310 to 4.2 pCi/L
2006-02-141.69 pCi/L700.9 to 2.8 pCi/L
2006-02-132.49 pCi/L700.5 to 4.1 pCi/L
2005-11-282.12 pCi/L1301 to 4.1 pCi/L
2005-08-102.1 pCi/L1101.1 to 4.1 pCi/L
2005-05-182.74 pCi/L1300.9 to 4.6 pCi/L
2005-02-162.32 pCi/L1301 to 4 pCi/L
2004-12-062.71 pCi/L1301.2 to 4.2 pCi/L
2004-05-312.33 pCi/L1400.3 to 5 pCi/L
2004-04-080.18 pCi/L600.11 to 0.24 pCi/L
2004-04-070.4 pCi/L400.27 to 0.5 pCi/L
2004-03-222.19 pCi/L1400.3 to 4.2 pCi/L
2004-02-200.29 pCi/L200.2 to 0.38 pCi/L