The Power of Information

National Drinking Water Database


City of Modesto Utilities - Modesto, CA


Serves 190,106 people

Alpha particle activity

Alpha particles are a form of radiation released from mining waste pollutants and natural sources.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
196 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)
22 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
204 days
Tests ConductedNumber of individual tests done for this contaminant
594 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
Alpha particle activityAlpha particles are a form of radiation released from mining waste pollutants and natural sources.8.11 pCi/L
29.1 pCi/L
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 pCi/L
Yes
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

Health Based Limits for Alpha particle activity

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 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
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-03-247.4 pCi/L107.4 pCi/L
2009-02-2412 pCi/L1012 pCi/L
2009-01-270 pCi/L110 pCi/L
2008-12-236.8 pCi/L106.8 pCi/L
2008-11-254.35 pCi/L210 to 8.7 pCi/L
2008-11-180 pCi/L110 pCi/L
2008-11-1222 pCi/L1022 pCi/L
2008-10-2211 pCi/L1011 pCi/L
2008-09-244.6 pCi/L104.6 pCi/L
2008-09-109.51 pCi/L810 to 19 pCi/L
2008-08-2610 pCi/L1010 pCi/L
2008-07-298.7 pCi/L108.7 pCi/L
2008-06-2414 pCi/L1014 pCi/L
2008-06-1221 pCi/L1021 pCi/L
2008-06-1117.9 pCi/L308.7 to 28 pCi/L
2008-06-1019 pCi/L6014 to 34 pCi/L
2008-06-0910 pCi/L1010 pCi/L
2008-05-2712 pCi/L1012 pCi/L
2008-05-226 pCi/L106 pCi/L
2008-05-190 pCi/L110 pCi/L
2008-05-050 pCi/L110 pCi/L
2008-04-2912 pCi/L1012 pCi/L
2008-04-236 pCi/L106 pCi/L
2008-02-2610.1 pCi/L1010.1 pCi/L
2008-02-191.07 pCi/L101.07 pCi/L
2008-02-040.66 pCi/L100.66 pCi/L
2008-01-298.3 pCi/L108.3 pCi/L
2008-01-221.56 pCi/L101.56 pCi/L
2008-01-098.3 pCi/L108.3 pCi/L
2007-12-267.22 pCi/L107.22 pCi/L
2007-12-1122.52 pCi/L204.14 to 40.9 pCi/L
2007-11-2711.2 pCi/L2011 to 11.4 pCi/L
2007-11-155.1 pCi/L105.1 pCi/L
2007-11-1321.2 pCi/L205.4 to 37 pCi/L
2007-11-050 pCi/L110 pCi/L
2007-10-236.64 pCi/L204.98 to 8.3 pCi/L
2007-10-0314.05 pCi/L2014 to 14.1 pCi/L
2007-10-016.58 pCi/L206.35 to 6.8 pCi/L
2007-09-255.44 pCi/L204.38 to 6.5 pCi/L
2007-09-0429.1 pCi/L1029.1 pCi/L
2007-08-2815.1 pCi/L1015.1 pCi/L
2007-08-0612.2 pCi/L1012.2 pCi/L
2007-07-2412.9 pCi/L1012.9 pCi/L
2007-07-173.15 pCi/L103.15 pCi/L
2007-07-0210.9 pCi/L1010.9 pCi/L
2007-06-2612.5 pCi/L1012.5 pCi/L
2007-06-2013.25 pCi/L2012 to 14.5 pCi/L
2007-06-1318.15 pCi/L2017.1 to 19.2 pCi/L
2007-06-1114 pCi/L1014 pCi/L
2007-06-0621.95 pCi/L2013.9 to 30 pCi/L
2007-06-058.91 pCi/L108.91 pCi/L
2007-05-226.98 pCi/L106.98 pCi/L
2007-05-156.97 pCi/L106.97 pCi/L
2007-05-078.99 pCi/L108.99 pCi/L
2007-04-242.9 pCi/L102.9 pCi/L
2007-04-170 pCi/L220 pCi/L
2007-04-0220.4 pCi/L1020.4 pCi/L
2007-03-0722.2 pCi/L1022.2 pCi/L
2007-02-1410.3 pCi/L1010.3 pCi/L
2007-02-072.66 pCi/L102.66 pCi/L
2007-02-0616.6 pCi/L1016.6 pCi/L
2007-01-170 pCi/L110 pCi/L
2007-01-032.32 pCi/L102.32 pCi/L
2007-01-0225.8 pCi/L1025.8 pCi/L
2006-12-1912.9 pCi/L1012.9 pCi/L
2006-12-070 pCi/L110 pCi/L
2006-12-0518.7 pCi/L1018.7 pCi/L
2006-11-0715.85 pCi/L2014.1 to 17.6 pCi/L
2006-10-1816.1 pCi/L1016.1 pCi/L
2006-10-036.65 pCi/L106.65 pCi/L
2006-09-261.21 pCi/L101.21 pCi/L
2006-09-2023.2 pCi/L1023.2 pCi/L
2006-09-193.07 pCi/L103.07 pCi/L
2006-09-068.45 pCi/L108.45 pCi/L
2006-09-0515.93 pCi/L207.56 to 24.3 pCi/L
2006-08-308.69 pCi/L108.69 pCi/L
2006-08-237.72 pCi/L107.72 pCi/L
2006-08-226.06 pCi/L106.06 pCi/L
2006-08-1611.88 pCi/L306.94 to 20 pCi/L
2006-08-150.76 pCi/L100.76 pCi/L
2006-08-099.43 pCi/L206.95 to 11.9 pCi/L
2006-08-036.51 pCi/L106.51 pCi/L
2006-08-0110.7 pCi/L306.95 to 17.8 pCi/L
2006-07-279.55 pCi/L205.9 to 13.2 pCi/L
2006-07-184.52 pCi/L310 to 12.3 pCi/L
2006-07-0512.15 pCi/L205 to 19.3 pCi/L
2006-06-0727.5 pCi/L1027.5 pCi/L
2006-06-0616.3 pCi/L1016.3 pCi/L
2006-05-239.67 pCi/L109.67 pCi/L
2006-05-178.29 pCi/L108.29 pCi/L
2006-05-160.95 pCi/L100.95 pCi/L
2006-05-0813.6 pCi/L1013.6 pCi/L
2006-05-035.58 pCi/L204.83 to 6.33 pCi/L
2006-05-0214.5 pCi/L1014.5 pCi/L
2006-04-054.63 pCi/L104.63 pCi/L
2006-04-0411.2 pCi/L1011.2 pCi/L
2006-03-212.19 pCi/L102.19 pCi/L
2006-03-0714.7 pCi/L1014.7 pCi/L
2006-03-027.2 pCi/L107.2 pCi/L
2006-03-014.82 pCi/L104.82 pCi/L
2006-02-2814.2 pCi/L1014.2 pCi/L
2006-02-210.53 pCi/L100.53 pCi/L
2006-02-153.55 pCi/L103.55 pCi/L
2006-02-0812.1 pCi/L1012.1 pCi/L
2006-02-0716.7 pCi/L1016.7 pCi/L
2006-02-015.72 pCi/L304.63 to 7.51 pCi/L
2005-12-205.74 pCi/L105.74 pCi/L
2005-11-239.96 pCi/L206.82 to 13.1 pCi/L
2005-11-228.61 pCi/L602.19 to 24.2 pCi/L
2005-11-167.46 pCi/L107.46 pCi/L
2005-11-155.78 pCi/L402.91 to 10.6 pCi/L
2005-11-093.34 pCi/L200.86 to 5.82 pCi/L
2005-11-0811.77 pCi/L3010.5 to 13.2 pCi/L
2005-11-022.96 pCi/L202.04 to 3.88 pCi/L
2005-11-016.83 pCi/L303.72 to 10.2 pCi/L
2005-10-263.85 pCi/L103.85 pCi/L
2005-10-255.26 pCi/L200.31 to 10.2 pCi/L
2005-10-198.07 pCi/L200.64 to 15.5 pCi/L
2005-10-188.54 pCi/L308.08 to 9.1 pCi/L
2005-10-124.88 pCi/L600.36 to 15.3 pCi/L
2005-10-115.21 pCi/L501.96 to 7.3 pCi/L
2005-10-049.73 pCi/L403.88 to 13.8 pCi/L
2005-09-285.65 pCi/L301.47 to 11.4 pCi/L
2005-09-273.88 pCi/L500.15 to 6.34 pCi/L
2005-09-225.38 pCi/L105.38 pCi/L
2005-09-213.7 pCi/L300.66 to 6.14 pCi/L
2005-09-206.15 pCi/L203.35 to 8.94 pCi/L
2005-09-146.11 pCi/L401.22 to 15 pCi/L
2005-09-138.69 pCi/L201.38 to 16 pCi/L
2005-09-077.84 pCi/L300.87 to 13.5 pCi/L
2005-09-065.7 pCi/L302.34 to 9.95 pCi/L
2005-07-275.25 pCi/L105.25 pCi/L
2005-07-200.64 pCi/L100.64 pCi/L
2005-07-122.7 pCi/L102.7 pCi/L
2005-07-060.93 pCi/L100.93 pCi/L
2005-07-0514.6 pCi/L1014.6 pCi/L
2005-06-304.74 pCi/L500.45 to 15 pCi/L
2005-06-2912.95 pCi/L2011.6 to 14.3 pCi/L
2005-06-286.94 pCi/L1002.35 to 12.6 pCi/L
2005-06-224.55 pCi/L300.35 to 7.7 pCi/L
2005-06-217.66 pCi/L500.64 to 13.2 pCi/L
2005-06-156.73 pCi/L400.31 to 12.5 pCi/L
2005-06-145.63 pCi/L401.99 to 8.86 pCi/L
2005-06-136.08 pCi/L204.74 to 7.41 pCi/L
2005-06-080.71 pCi/L100.71 pCi/L
2005-06-0711.05 pCi/L701.03 to 28.8 pCi/L
2005-05-251.51 pCi/L101.51 pCi/L
2005-05-245.75 pCi/L204.66 to 6.83 pCi/L
2005-05-175.08 pCi/L402.85 to 7.12 pCi/L
2005-05-112.94 pCi/L200.27 to 5.61 pCi/L
2005-05-1010.54 pCi/L205.88 to 15.2 pCi/L
2005-05-037.63 pCi/L107.63 pCi/L
2005-04-275.09 pCi/L105.09 pCi/L
2005-04-265.11 pCi/L304.16 to 6.68 pCi/L
2005-04-203.83 pCi/L301.54 to 5.87 pCi/L
2005-04-198.24 pCi/L502.62 to 16.2 pCi/L
2005-04-125.65 pCi/L105.65 pCi/L
2005-04-063.64 pCi/L800.28 to 13 pCi/L
2005-04-056.79 pCi/L303.56 to 12 pCi/L
2005-03-246.76 pCi/L306.18 to 7.19 pCi/L
2005-03-175.15 pCi/L700.32 to 9.81 pCi/L
2005-03-106.07 pCi/L205.38 to 6.76 pCi/L
2005-03-035.56 pCi/L400.31 to 11 pCi/L
2005-02-246.8 pCi/L701.88 to 12.2 pCi/L
2005-02-174.02 pCi/L600.74 to 6.03 pCi/L
2005-02-105.8 pCi/L401.38 to 7.85 pCi/L
2005-02-036.27 pCi/L300.58 to 11.4 pCi/L
2005-01-273.71 pCi/L403.14 to 4.3 pCi/L
2005-01-204.27 pCi/L800.04 to 11.5 pCi/L
2005-01-135.56 pCi/L700.15 to 14.2 pCi/L
2005-01-067.62 pCi/L1700.37 to 24.7 pCi/L
2004-12-3011.8 pCi/L207.69 to 15.9 pCi/L
2004-12-233.81 pCi/L400.07 to 7.03 pCi/L
2004-12-165.63 pCi/L105.63 pCi/L
2004-12-092.86 pCi/L301.74 to 5.03 pCi/L
2004-11-184.65 pCi/L104.65 pCi/L
2004-11-048.58 pCi/L1600.57 to 18.4 pCi/L
2004-10-215.11 pCi/L700.71 to 13.1 pCi/L
2004-10-144.97 pCi/L302.62 to 6.77 pCi/L
2004-10-078.73 pCi/L2601.05 to 19.4 pCi/L
2004-09-163.16 pCi/L500.58 to 5.83 pCi/L
2004-09-098.72 pCi/L307.32 to 9.82 pCi/L
2004-08-127 pCi/L1601 to 30.5 pCi/L
2004-08-0510.82 pCi/L1001.95 to 24.2 pCi/L
2004-07-2211.77 pCi/L400.27 to 24 pCi/L
2004-07-152.72 pCi/L910 to 7.46 pCi/L
2004-07-0812.72 pCi/L1200.93 to 29.2 pCi/L
2004-06-106.49 pCi/L200.87 to 12.1 pCi/L
2004-06-071.15 pCi/L101.15 pCi/L
2004-06-034.23 pCi/L201.02 to 7.43 pCi/L
2004-05-139.91 pCi/L803.62 to 24.1 pCi/L
2004-05-1112.4 pCi/L1012.4 pCi/L
2004-05-067.9 pCi/L1400.58 to 14.5 pCi/L
2004-04-290.89 pCi/L100.89 pCi/L
2004-04-159.05 pCi/L602.77 to 22.3 pCi/L
2004-04-087.88 pCi/L1300.07 to 15.6 pCi/L
2004-03-185.45 pCi/L105.45 pCi/L
2004-03-113.28 pCi/L103.28 pCi/L
2004-03-045.43 pCi/L105.43 pCi/L
2004-02-127.83 pCi/L1203.83 to 14.6 pCi/L
2004-02-055.21 pCi/L1400.04 to 13.7 pCi/L
2004-01-227.64 pCi/L800.17 to 27.7 pCi/L
2004-01-153.34 pCi/L500.07 to 5.39 pCi/L
2004-01-086.1 pCi/L704.01 to 10.1 pCi/L