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City of St. Louis Water Division Utilities - Saint Louis, MO

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Serves 370,000 people

Alpha particle activity (suspended)

Alpha particles are a form of radiation released from mining waste polluants and natural sources.

	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	1 days
Tests ConductedNumber of individual tests done for this contaminant	1 tests

Testing Summary

Contaminant	Average/ Maximum Result	Health Limit Exceeded	Legal Limit Exceeded	Testing History -Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
Alpha particle activity (suspended)Alpha particles are a form of radiation released from mining waste polluants and natural sources.	0 pCi/L 0 pCi/L	No	No 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 Alpha particle activity (suspended)

Health Based Limits for Alpha particle activity (suspended)

Standard	Description	Level
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 Date	Average Result	Samples taken that day	Number of Non-Detects	Range of Results
2008-06-01	0 pCi/L	1	0	0 pCi/L

** Sample result taken from systems 2008 Consumer Confidence Report