The Power of Information

National Drinking Water Database


Pomona - City, Water Dept. Utilities - Los Angeles, CA


Serves 156,500 people

Perchlorate

Perchlorate is a synthetic oxygen additive in solid fuel propellant for rockets, missiles, and fireworks, and is primarily used by the military and the space industry; it may occur naturally in certain imported agricultural fertilizers.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
232 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
474 days
Tests ConductedNumber of individual tests done for this contaminant
1,832 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
PerchloratePerchlorate is a synthetic oxygen additive in solid fuel propellant for rockets, missiles, and fireworks, and is primarily used by the military and the space industry; it may occur naturally in certain imported agricultural fertilizers.5.4 ppb
17 ppb
Yes
5 ppb
Legal at any levelThis is the Federal Limit. State Limits may be lower.
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 Perchlorate

Health Based Limits for Perchlorate

StandardDescriptionLevel
Health-Based Screening LevelA benchmark concentration of contaminants in water that may be of potential concern for human health, if exceeded. For noncarcinogens, the HBSL represents the contaminant concentration in drinking water that is not expected to cause any adverse effects over a lifetime of exposure. For carcinogens, the HBSL range represents the contaminant concentration in drinking water that corresponds to an excess estimated lifetime cancer risk of 1 chance in 1 million to 1 chance in 10 thousand. Source: U.S. Geological Survey.5 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.6 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-04-024.65 ppb210 to 9.3 ppb
2009-04-016.65 ppb1230 to 14 ppb
2009-03-312.9 ppb630 to 8.2 ppb
2009-03-253.5 ppb520 to 7.4 ppb
2009-03-186.5 ppb210 to 13 ppb
2009-03-163.14 ppb520 to 7.3 ppb
2009-03-114.53 ppb830 to 9.9 ppb
2009-03-037.63 ppb810 to 12 ppb
2009-03-023.36 ppb520 to 7.8 ppb
2009-02-260 ppb110 ppb
2009-02-233.87 ppb610 to 7.8 ppb
2009-02-200 ppb220 ppb
2009-02-194.4 ppb104.4 ppb
2009-02-113.17 ppb320 to 9.5 ppb
2009-02-104.8 ppb502.1 to 8.2 ppb
2009-02-058.2 ppb206.5 to 9.9 ppb
2009-02-049.53 ppb606 to 13 ppb
2009-02-023.08 ppb830 to 8.9 ppb
2009-01-270 ppb110 ppb
2009-01-264.98 ppb503.1 to 8.2 ppb
2009-01-234 ppb210 to 8 ppb
2009-01-215 ppb210 to 10 ppb
2009-01-203.9 ppb310 to 7.7 ppb
2009-01-159.3 ppb109.3 ppb
2009-01-144.6 ppb310 to 10 ppb
2009-01-133.7 ppb720 to 8.2 ppb
2009-01-073.43 ppb420 to 8.7 ppb
2009-01-064.08 ppb1140 to 11 ppb
2009-01-055 ppb502.8 to 8.2 ppb
2008-12-304.39 ppb710 to 8.8 ppb
2008-12-233.99 ppb720 to 11 ppb
2008-12-171.25 ppb210 to 2.5 ppb
2008-12-162.9 ppb820 to 7.5 ppb
2008-12-116.15 ppb410 to 12 ppb
2008-12-102.2 ppb102.2 ppb
2008-12-084.42 ppb502 to 8.2 ppb
2008-12-030 ppb110 ppb
2008-12-028.2 ppb505.9 to 10 ppb
2008-12-014.18 ppb502.1 to 7.4 ppb
2008-11-243.95 ppb602.3 to 7.3 ppb
2008-11-201.5 ppb210 to 3 ppb
2008-11-190.67 ppb320 to 2 ppb
2008-11-174.16 ppb502 to 7.1 ppb
2008-11-125.24 ppb510 to 13 ppb
2008-11-104.24 ppb502 to 7.7 ppb
2008-11-033.86 ppb510 to 6.5 ppb
2008-10-301.3 ppb210 to 2.6 ppb
2008-10-284.25 ppb210 to 8.5 ppb
2008-10-273.74 ppb502 to 6.1 ppb
2008-10-210 ppb220 ppb
2008-10-203.67 ppb610 to 7.9 ppb
2008-10-165.77 ppb310 to 12 ppb
2008-10-151.8 ppb520 to 4.3 ppb
2008-10-134.76 ppb502.8 to 7.7 ppb
2008-10-083.59 ppb730 to 9.8 ppb
2008-10-064.54 ppb502.8 to 7.5 ppb
2008-09-293.75 ppb610 to 8 ppb
2008-09-230 ppb110 ppb
2008-09-224.8 ppb502.5 to 8.3 ppb
2008-09-163.67 ppb730 to 13 ppb
2008-09-153.88 ppb502.1 to 7.7 ppb
2008-09-100 ppb110 ppb
2008-09-083.44 ppb510 to 6.7 ppb
2008-09-051.55 ppb210 to 3.1 ppb
2008-09-037.05 ppb1102 to 10 ppb
2008-09-025.08 ppb503.9 to 8.3 ppb
2008-08-260 ppb330 ppb
2008-08-252.8 ppb510 to 5.9 ppb
2008-08-194.3 ppb104.3 ppb
2008-08-143.3 ppb203.3 ppb
2008-08-133.08 ppb530 to 11 ppb
2008-08-123.5 ppb103.5 ppb
2008-08-113.98 ppb502.1 to 6.9 ppb
2008-08-0710 ppb207 to 13 ppb
2008-08-066.25 ppb410 to 10 ppb
2008-08-056.9 ppb503.8 to 10 ppb
2008-08-044.98 ppb503.2 to 8.3 ppb
2008-07-283.23 ppb620 to 7.7 ppb
2008-07-230 ppb110 ppb
2008-07-222.7 ppb102.7 ppb
2008-07-214.54 ppb502.3 to 7.5 ppb
2008-07-152.95 ppb840 to 11 ppb
2008-07-143.18 ppb510 to 6.1 ppb
2008-07-097 ppb107 ppb
2008-07-086.5 ppb210 to 13 ppb
2008-07-074.14 ppb502.5 to 7 ppb
2008-07-022.1 ppb1050 to 7 ppb
2008-07-016.61 ppb1002.4 to 9.6 ppb
2008-06-240 ppb110 ppb
2008-06-232.92 ppb510 to 5.7 ppb
2008-06-180 ppb330 ppb
2008-06-175.62 ppb520 to 13 ppb
2008-06-164 ppb502.5 to 6.5 ppb
2008-06-118.3 ppb108.3 ppb
2008-06-102.4 ppb310 to 3.8 ppb
2008-06-093.88 ppb510 to 7.1 ppb
2008-06-048.92 ppb505.5 to 13 ppb
2008-06-023.84 ppb502 to 6.6 ppb
2008-05-287.33 ppb310 to 14 ppb
2008-05-273.2 ppb510 to 6.4 ppb
2008-05-200 ppb110 ppb
2008-05-192.98 ppb620 to 8.2 ppb
2008-05-143.5 ppb430 to 14 ppb
2008-05-124.96 ppb502.7 to 9.1 ppb
2008-05-0810 ppb1010 ppb
2008-05-0710.5 ppb209 to 12 ppb
2008-05-068.03 ppb910 to 13 ppb
2008-05-053.96 ppb510 to 7.6 ppb
2008-05-017.43 ppb304.9 to 12 ppb
2008-04-290 ppb110 ppb
2008-04-284.14 ppb502.1 to 7.5 ppb
2008-04-230 ppb110 ppb
2008-04-213.92 ppb510 to 7.7 ppb
2008-04-162.5 ppb310 to 4.7 ppb
2008-04-150 ppb110 ppb
2008-04-144.84 ppb502.9 to 7.5 ppb
2008-04-080 ppb220 ppb
2008-04-075.89 ppb702.3 to 11 ppb
2008-04-025.93 ppb1220 to 11 ppb
2008-04-014.1 ppb720 to 9.9 ppb
2008-03-2613 ppb1013 ppb
2008-03-255 ppb210 to 10 ppb
2008-03-245 ppb503.1 to 8.1 ppb
2008-03-182.7 ppb420 to 6.4 ppb
2008-03-175.02 ppb503.5 to 7.3 ppb
2008-03-115.5 ppb210 to 11 ppb
2008-03-103.9 ppb510 to 8.5 ppb
2008-03-057.74 ppb504.3 to 10 ppb
2008-03-047.25 ppb410 to 13 ppb
2008-03-034.72 ppb502.5 to 8.2 ppb
2008-02-264.3 ppb410 to 9.3 ppb
2008-02-254.08 ppb510 to 6.7 ppb
2008-02-200 ppb330 ppb
2008-02-194.84 ppb503.5 to 7.6 ppb
2008-02-1310.35 ppb207.7 to 13 ppb
2008-02-120 ppb110 ppb
2008-02-113.94 ppb502.6 to 6.4 ppb
2008-02-067.34 ppb503.3 to 10 ppb
2008-02-043.93 ppb720 to 10 ppb
2008-01-310 ppb110 ppb
2008-01-291.75 ppb210 to 3.5 ppb
2008-01-283.48 ppb610 to 7.3 ppb
2008-01-240 ppb110 ppb
2008-01-233.2 ppb103.2 ppb
2008-01-224.12 ppb502 to 6.8 ppb
2008-01-144.36 ppb510 to 7.7 ppb
2008-01-091.2 ppb210 to 2.4 ppb
2008-01-086.83 ppb410 to 10 ppb
2008-01-073.74 ppb510 to 7 ppb
2008-01-027.63 ppb603.8 to 13 ppb
2007-12-314.88 ppb502.6 to 8.4 ppb
2007-12-275.6 ppb105.6 ppb
2007-12-263.76 ppb510 to 8.9 ppb
2007-12-174.76 ppb502.9 to 7.9 ppb
2007-12-104.68 ppb502.5 to 7.6 ppb
2007-12-056.3 ppb106.3 ppb
2007-12-047.93 ppb1020 to 13 ppb
2007-12-035.04 ppb502.2 to 8.1 ppb
2007-11-264.13 ppb303.3 to 5 ppb
2007-11-202.77 ppb302.1 to 3.1 ppb
2007-11-194.03 ppb303.5 to 4.6 ppb
2007-11-144.3 ppb104.3 ppb
2007-11-133.8 ppb203.4 to 4.2 ppb
2007-11-064.03 ppb920 to 8.9 ppb
2007-11-027.45 ppb604 to 10 ppb
2007-10-303.5 ppb103.5 ppb
2007-10-294.4 ppb204 to 4.8 ppb
2007-10-244 ppb104 ppb
2007-10-234.23 ppb304 to 4.6 ppb
2007-10-172.15 ppb210 to 4.3 ppb
2007-10-163.77 ppb310 to 5.7 ppb
2007-10-104.77 ppb304.3 to 5.6 ppb
2007-10-097.66 ppb503.6 to 12 ppb
2007-10-035.85 ppb403.9 to 7.8 ppb
2007-10-026.87 ppb702.2 to 11 ppb
2007-09-254.45 ppb410 to 7 ppb
2007-09-190 ppb110 ppb
2007-09-185.27 ppb303.8 to 6.3 ppb
2007-09-1310.88 ppb408 to 15 ppb
2007-09-114.43 ppb303.3 to 6.4 ppb
2007-09-057.18 ppb1210 to 12 ppb
2007-08-303.7 ppb210 to 7.4 ppb
2007-08-295.53 ppb303.1 to 7.2 ppb
2007-08-223.08 ppb420 to 6.9 ppb
2007-08-162 ppb102 ppb
2007-08-144.28 ppb520 to 9.9 ppb
2007-08-088.15 ppb404.3 to 11 ppb
2007-08-077.63 ppb902.4 to 11 ppb
2007-08-017.84 ppb503.7 to 11 ppb
2007-07-314.93 ppb304.8 to 5 ppb
2007-07-254.9 ppb303.9 to 5.6 ppb
2007-07-240 ppb110 ppb
2007-07-173.68 ppb510 to 6.1 ppb
2007-07-115.57 ppb602.7 to 7.6 ppb
2007-07-107.87 ppb903.2 to 11 ppb
2007-07-035.57 ppb1010 to 9.8 ppb
2007-06-264.9 ppb303.6 to 5.8 ppb
2007-06-255.4 ppb105.4 ppb
2007-06-194.47 ppb302.2 to 5.7 ppb
2007-06-124.63 ppb303.8 to 5.4 ppb
2007-06-0713 ppb1013 ppb
2007-06-064.02 ppb1250 to 9 ppb
2007-06-0510.16 ppb803.6 to 14 ppb
2007-05-225 ppb304.2 to 5.5 ppb
2007-05-188.73 ppb810 to 15 ppb
2007-05-155.33 ppb304.4 to 5.8 ppb
2007-05-094.83 ppb302.9 to 5.8 ppb
2007-05-032.5 ppb102.5 ppb
2007-05-028.13 ppb1110 to 13 ppb
2007-05-015.32 ppb502.1 to 8.3 ppb
2007-04-244.4 ppb304.3 to 4.5 ppb
2007-04-174.2 ppb303.3 to 5 ppb
2007-04-1210 ppb1010 ppb
2007-04-116.9 ppb310 to 11 ppb
2007-04-104.8 ppb303.6 to 5.7 ppb
2007-04-058.15 ppb204.3 to 12 ppb
2007-04-048.07 ppb610 to 11 ppb
2007-04-034.06 ppb510 to 6.8 ppb
2007-03-274.93 ppb304.1 to 5.9 ppb
2007-03-204.37 ppb310 to 7.3 ppb
2007-03-156.1 ppb106.1 ppb
2007-03-144.35 ppb203.1 to 5.6 ppb
2007-03-139.45 ppb209.2 to 9.7 ppb
2007-03-077.7 ppb107.7 ppb
2007-03-064.56 ppb502 to 7.4 ppb
2007-02-274.3 ppb302.8 to 5.3 ppb
2007-02-214.5 ppb304.2 to 5 ppb
2007-02-144.63 ppb302.9 to 5.7 ppb
2007-02-078.53 ppb307 to 11 ppb
2007-02-064.82 ppb510 to 10 ppb
2007-01-306.03 ppb305 to 7.9 ppb
2007-01-261.35 ppb210 to 2.7 ppb
2007-01-246.45 ppb403.5 to 9.4 ppb
2007-01-2312 ppb1012 ppb
2007-01-229.95 ppb209.9 to 10 ppb
2007-01-1811.12 ppb604.4 to 15 ppb
2007-01-174.7 ppb303.9 to 5.2 ppb
2007-01-106.46 ppb702.5 to 14 ppb
2007-01-098.2 ppb303.2 to 12 ppb
2007-01-032.88 ppb630 to 7.5 ppb
2006-12-285.03 ppb304.1 to 6 ppb
2006-12-196.95 ppb404.8 to 12 ppb
2006-12-142.3 ppb102.3 ppb
2006-12-124.83 ppb304.6 to 5 ppb
2006-12-0610.5 ppb2010 to 11 ppb
2006-12-055.32 ppb610 to 8.4 ppb
2006-11-275.23 ppb304.8 to 5.9 ppb
2006-11-214.2 ppb104.2 ppb
2006-11-206.8 ppb206.3 to 7.3 ppb
2006-11-156.57 ppb305.5 to 8.4 ppb
2006-11-143.6 ppb103.6 ppb
2006-11-081.5 ppb210 to 3 ppb
2006-11-073.98 ppb520 to 7.6 ppb
2006-11-0110.8 ppb209.6 to 12 ppb
2006-10-314.87 ppb303.2 to 6.2 ppb
2006-10-2512 ppb1012 ppb
2006-10-246.4 ppb304.5 to 8.1 ppb
2006-10-1812.33 ppb3011 to 14 ppb
2006-10-175.17 ppb304.7 to 6 ppb
2006-10-1215 ppb2015 ppb
2006-10-1112 ppb1012 ppb
2006-10-107.25 ppb403.7 to 14 ppb
2006-10-046.68 ppb410 to 11 ppb
2006-10-035.39 ppb902.3 to 8.8 ppb
2006-09-265.67 ppb304.7 to 6.5 ppb
2006-09-194.1 ppb302.3 to 6 ppb
2006-09-127.47 ppb603.8 to 11 ppb
2006-09-065.07 ppb602.3 to 8.8 ppb
2006-08-294.53 ppb303.5 to 6 ppb
2006-08-224.3 ppb303.6 to 5 ppb
2006-08-154 ppb303.1 to 5.4 ppb
2006-08-140 ppb110 ppb
2006-08-085.6 ppb504.4 to 8.6 ppb
2006-08-024.84 ppb510 to 8.7 ppb
2006-08-0110.9 ppb209.8 to 12 ppb
2006-07-262.1 ppb102.1 ppb
2006-07-255.25 ppb204.5 to 6 ppb
2006-07-208.2 ppb108.2 ppb
2006-07-183.48 ppb410 to 5.5 ppb
2006-07-128 ppb306.65 to 9.07 ppb
2006-07-117.19 ppb710 to 13 ppb
2006-07-053.42 ppb630 to 9.27 ppb
2006-06-275.7 ppb304.7 to 6.8 ppb
2006-06-216.02 ppb106.02 ppb
2006-06-203.9 ppb203.2 to 4.6 ppb
2006-06-145.66 ppb304.95 to 6.8 ppb
2006-06-076.5 ppb610 to 11.7 ppb
2006-06-0611.5 ppb2011 to 12 ppb
2006-06-019.8 ppb109.8 ppb
2006-05-305.9 ppb304.7 to 7.1 ppb
2006-05-244.06 ppb104.06 ppb
2006-05-170 ppb110 ppb
2006-05-163.4 ppb310 to 5.1 ppb
2006-05-103.47 ppb520 to 6.15 ppb
2006-05-0911 ppb1011 ppb
2006-05-025.97 ppb602.3 to 9.1 ppb
2006-04-262.38 ppb210 to 4.76 ppb
2006-04-254.5 ppb104.5 ppb
2006-04-240 ppb110 ppb
2006-04-195.29 ppb305.08 to 5.41 ppb
2006-04-124.77 ppb410 to 8.73 ppb
2006-04-1112 ppb2011 to 13 ppb
2006-04-0510.52 ppb209.34 to 11.7 ppb
2006-04-044.16 ppb710 to 8.1 ppb
2006-03-284.87 ppb303.9 to 5.6 ppb
2006-03-224.79 ppb104.79 ppb
2006-03-216.37 ppb305.3 to 8.1 ppb
2006-03-155.54 ppb304.65 to 6.37 ppb
2006-03-149.95 ppb208.9 to 11 ppb
2006-03-085 ppb105 ppb
2006-03-075.05 ppb204.8 to 5.3 ppb
2006-03-012.83 ppb420 to 6.6 ppb
2006-02-225.53 ppb510 to 10.1 ppb
2006-02-155.88 ppb404.17 to 9 ppb
2006-02-075.72 ppb410 to 11.7 ppb
2006-02-015.64 ppb720 to 11.8 ppb
2006-01-250 ppb110 ppb
2006-01-247.83 ppb306 to 11 ppb
2006-01-198.55 ppb204.1 to 13 ppb
2006-01-185.11 ppb403.5 to 6.9 ppb
2006-01-116.49 ppb610 to 12.6 ppb
2006-01-102.5 ppb210 to 5 ppb
2006-01-058.9 ppb603.6 to 14 ppb
2006-01-044.67 ppb510 to 8.53 ppb
2005-12-283.9 ppb310 to 6 ppb
2005-12-215.3 ppb304.4 to 5.8 ppb
2005-12-1510.5 ppb2010 to 11 ppb
2005-12-144.93 ppb303.4 to 6 ppb
2005-12-1313 ppb1013 ppb
2005-12-0714 ppb1014 ppb
2005-12-064.76 ppb502 to 8.3 ppb
2005-11-295.2 ppb304 to 6.5 ppb
2005-11-224.9 ppb303.4 to 5.8 ppb
2005-11-157.24 ppb504.4 to 11 ppb
2005-11-084.37 ppb302.2 to 5.7 ppb
2005-11-026.38 ppb603 to 13 ppb
2005-11-012.13 ppb310 to 3.8 ppb
2005-10-2717 ppb1017 ppb
2005-10-268.4 ppb305.7 to 12 ppb
2005-10-254.4 ppb104.4 ppb
2005-10-2011.5 ppb2010 to 13 ppb
2005-10-198.03 ppb405.1 to 11 ppb
2005-10-185.2 ppb105.2 ppb
2005-10-116.75 ppb404 to 12 ppb
2005-10-071.15 ppb210 to 2.3 ppb
2005-10-0511 ppb2010 to 12 ppb
2005-10-043.88 ppb610 to 7.2 ppb
2005-09-276.1 ppb403.6 to 11 ppb
2005-09-217.14 ppb504.1 to 11 ppb
2005-09-134.6 ppb303.4 to 5.5 ppb
2005-09-083.6 ppb203 to 4.2 ppb
2005-09-0713 ppb1013 ppb
2005-09-065.78 ppb402.8 to 8.1 ppb
2005-08-315.7 ppb205.6 to 5.8 ppb
2005-08-304.5 ppb104.5 ppb
2005-08-255.4 ppb205.2 to 5.6 ppb
2005-08-185.65 ppb205.2 to 6.1 ppb
2005-08-179.6 ppb109.6 ppb
2005-08-165.2 ppb105.2 ppb
2005-08-1111 ppb1011 ppb
2005-08-106.35 ppb202.7 to 10 ppb
2005-08-095.1 ppb304.3 to 6.1 ppb
2005-08-0313 ppb1013 ppb
2005-08-024.5 ppb602.1 to 7.2 ppb
2005-07-286 ppb210 to 12 ppb
2005-07-264 ppb410 to 6.1 ppb
2005-07-2516 ppb1016 ppb
2005-07-209.55 ppb209.5 to 9.6 ppb
2005-07-196.55 ppb403.5 to 11 ppb
2005-07-145.1 ppb105.1 ppb
2005-07-135.4 ppb205.3 to 5.5 ppb
2005-07-123.4 ppb103.4 ppb
2005-07-075.68 ppb403 to 9.9 ppb
2005-07-068.45 ppb202.9 to 14 ppb
2005-07-059.85 ppb206.7 to 13 ppb
2005-06-303.8 ppb103.8 ppb
2005-06-285.83 ppb304.8 to 6.7 ppb
2005-06-2210.5 ppb2010 to 11 ppb
2005-06-215.57 ppb304.4 to 6.3 ppb
2005-06-153.5 ppb103.5 ppb
2005-06-146.05 ppb205.8 to 6.3 ppb
2005-06-074.9 ppb402.8 to 6.9 ppb
2005-06-029.8 ppb303.4 to 14 ppb
2005-06-016.38 ppb402.9 to 10 ppb
2005-05-247.14 ppb502.9 to 11 ppb
2005-05-173.28 ppb510 to 6.6 ppb
2005-05-105.36 ppb502.1 to 10 ppb
2005-05-053.35 ppb210 to 6.7 ppb
2005-05-045.45 ppb203.4 to 7.5 ppb
2005-05-0313 ppb4012 to 14 ppb
2005-04-254.15 ppb402.2 to 6.3 ppb
2005-04-193.92 ppb510 to 7.1 ppb
2005-04-146 ppb106 ppb
2005-04-135.03 ppb402.1 to 7.3 ppb
2005-04-125.5 ppb210 to 11 ppb
2005-04-0610.81 ppb703.7 to 13 ppb
2005-04-055.66 ppb503 to 9.7 ppb
2005-03-284.8 ppb502.1 to 9 ppb
2005-03-234.86 ppb503 to 8 ppb
2005-03-164.44 ppb520 to 10 ppb
2005-03-104.04 ppb520 to 8.1 ppb
2005-03-020 ppb220 ppb
2005-03-015.22 ppb510 to 9.5 ppb
2005-02-244.78 ppb510 to 8.7 ppb
2005-02-095.2 ppb620 to 11 ppb
2005-02-025.18 ppb510 to 9.9 ppb
2005-02-0111.86 ppb7010 to 13 ppb
2005-01-270 ppb110 ppb
2005-01-255.36 ppb510 to 11 ppb
2005-01-206.66 ppb503.1 to 9.9 ppb
2005-01-125.1 ppb510 to 9.8 ppb
2005-01-056.56 ppb1120 to 13 ppb
2004-12-284.7 ppb510 to 9 ppb
2004-12-204.9 ppb510 to 9.4 ppb
2004-12-155.72 ppb603.3 to 8.9 ppb
2004-12-084.58 ppb510 to 7.8 ppb
2004-12-0212 ppb2012 ppb
2004-12-019.24 ppb706.2 to 14 ppb
2004-11-225.1 ppb510 to 9.7 ppb
2004-11-177.23 ppb603 to 12 ppb
2004-11-103.76 ppb730 to 8.5 ppb
2004-11-039.5 ppb1420 to 15 ppb
2004-10-274.83 ppb410 to 8.9 ppb
2004-10-2510 ppb1010 ppb
2004-10-223.5 ppb103.5 ppb
2004-10-205.18 ppb620 to 11 ppb
2004-10-067.83 ppb610 to 13 ppb
2004-09-295.3 ppb410 to 10 ppb
2004-09-225.9 ppb620 to 13 ppb
2004-09-160 ppb220 ppb
2004-09-155.97 ppb1010 to 11 ppb
2004-09-084.83 ppb410 to 9.2 ppb
2004-09-018.65 ppb810 to 14 ppb
2004-08-255.05 ppb410 to 9.9 ppb
2004-08-186.7 ppb510 to 12 ppb
2004-08-115.33 ppb410 to 9.7 ppb
2004-08-048.68 ppb810 to 14 ppb
2004-07-285.38 ppb410 to 11 ppb
2004-07-216.05 ppb410 to 11 ppb
2004-07-148.5 ppb603.9 to 15 ppb
2004-07-079.37 ppb603 to 15 ppb
2004-06-306.43 ppb403.2 to 10 ppb
2004-06-235.45 ppb410 to 9.2 ppb
2004-06-165.15 ppb410 to 8.9 ppb
2004-06-150 ppb110 ppb
2004-06-094.83 ppb410 to 8.4 ppb
2004-06-025.3 ppb410 to 9.5 ppb
2004-05-300 ppb110 ppb
2004-05-266.38 ppb603.3 to 10 ppb
2004-05-196.2 ppb603.2 to 9.8 ppb
2004-05-139.7 ppb109.7 ppb
2004-05-125.14 ppb520 to 12 ppb
2004-05-058.25 ppb404.4 to 13 ppb
2004-04-284.92 ppb520 to 11 ppb
2004-04-215.53 ppb710 to 11 ppb
2004-04-146.67 ppb920 to 13 ppb
2004-04-089.03 ppb604.1 to 13 ppb
2004-04-074.21 ppb940 to 11 ppb
2004-04-020 ppb110 ppb
2004-03-315.36 ppb520 to 12 ppb
2004-03-245.36 ppb510 to 11 ppb
2004-03-176.85 ppb403 to 11 ppb
2004-03-106.18 ppb410 to 12 ppb
2004-03-035.78 ppb510 to 11 ppb
2004-02-256.96 ppb510 to 14 ppb
2004-02-185.38 ppb410 to 9 ppb
2004-02-118.13 ppb610 to 15 ppb
2004-02-046.15 ppb410 to 11 ppb
2004-02-038.8 ppb108.8 ppb
2004-02-0212.47 ppb308.4 to 15 ppb
2004-01-274.85 ppb410 to 9.8 ppb
2004-01-205.4 ppb410 to 9.5 ppb
2004-01-134.98 ppb410 to 8.7 ppb
2004-01-064.85 ppb410 to 8.4 ppb