The Power of Information

National Drinking Water Database


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


Serves 156,500 people

Tetrachloroethylene

Tetrachloroethylene (perc) is a common soil and groundwater contaminant used in dry cleaning and as a solvent in automotive and metalworking factories and other industries.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
345 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)
31 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
485 days
Tests ConductedNumber of individual tests done for this contaminant
1,420 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
TetrachloroethyleneTetrachloroethylene (perc) is a common soil and groundwater contaminant used in dry cleaning and as a solvent in automotive and metalworking factories and other industries.1.36 ppb
14 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
Yes
5 ppb
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 Tetrachloroethylene

Health Based Limits for Tetrachloroethylene

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.0.06 ppb
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.0.69 ppb
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.5 ppb
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.10 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.500 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.2000 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.2000 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-04-020 ppb220 ppb
2009-03-312 ppb201.8 to 2.2 ppb
2009-03-252.24 ppb202.07 to 2.4 ppb
2009-03-161.85 ppb201.2 to 2.5 ppb
2009-03-115.66 ppb400.64 to 10.7 ppb
2009-03-020.38 ppb210 to 0.75 ppb
2009-02-231.06 ppb200.92 to 1.2 ppb
2009-02-184.98 ppb302.21 to 10.1 ppb
2009-02-110 ppb220 ppb
2009-02-101.4 ppb201.4 ppb
2009-02-051.76 ppb200.52 to 3 ppb
2009-02-041.7 ppb430 to 6.8 ppb
2009-02-021.78 ppb201.53 to 2.03 ppb
2009-01-261.65 ppb201.4 to 1.9 ppb
2009-01-239.6 ppb109.6 ppb
2009-01-210 ppb330 ppb
2009-01-200 ppb110 ppb
2009-01-150 ppb220 ppb
2009-01-140 ppb220 ppb
2009-01-132.2 ppb202 to 2.4 ppb
2009-01-070.72 ppb540 to 3.61 ppb
2009-01-061.1 ppb760 to 7.7 ppb
2009-01-052.62 ppb502.2 to 2.9 ppb
2008-12-304.73 ppb301.8 to 9.8 ppb
2008-12-230.46 ppb420 to 1 ppb
2008-12-160.25 ppb320 to 0.75 ppb
2008-12-112.1 ppb210 to 4.2 ppb
2008-12-100 ppb110 ppb
2008-12-080.47 ppb210 to 0.94 ppb
2008-12-030 ppb110 ppb
2008-12-021.88 ppb430 to 7.5 ppb
2008-12-010.8 ppb210 to 1.6 ppb
2008-11-240.53 ppb320 to 1.6 ppb
2008-11-190 ppb110 ppb
2008-11-170.85 ppb210 to 1.7 ppb
2008-11-121.48 ppb320 to 4.43 ppb
2008-11-100.75 ppb210 to 1.5 ppb
2008-11-053.03 ppb320 to 9.1 ppb
2008-11-032.15 ppb201.7 to 2.6 ppb
2008-10-290 ppb220 ppb
2008-10-2811 ppb1011 ppb
2008-10-271.09 ppb200.67 to 1.5 ppb
2008-10-220 ppb220 ppb
2008-10-201.04 ppb200.68 to 1.4 ppb
2008-10-160 ppb220 ppb
2008-10-150 ppb220 ppb
2008-10-131.1 ppb200.69 to 1.5 ppb
2008-10-082.14 ppb640 to 9.11 ppb
2008-10-061.04 ppb200.68 to 1.4 ppb
2008-10-010.1 ppb650 to 0.61 ppb
2008-09-290.52 ppb420 to 1.5 ppb
2008-09-230 ppb220 ppb
2008-09-220.7 ppb210 to 1.4 ppb
2008-09-170 ppb220 ppb
2008-09-160 ppb110 ppb
2008-09-150.7 ppb210 to 1.4 ppb
2008-09-100 ppb220 ppb
2008-09-080.8 ppb210 to 1.6 ppb
2008-09-050 ppb110 ppb
2008-09-020.97 ppb200.53 to 1.4 ppb
2008-08-260 ppb220 ppb
2008-08-250.7 ppb210 to 1.4 ppb
2008-08-210 ppb110 ppb
2008-08-190 ppb220 ppb
2008-08-130 ppb330 ppb
2008-08-110.7 ppb210 to 1.4 ppb
2008-08-073.9 ppb210 to 7.8 ppb
2008-08-060 ppb550 ppb
2008-08-051.58 ppb310 to 4.1 ppb
2008-08-041.1 ppb210 to 2.2 ppb
2008-07-280.38 ppb430 to 1.5 ppb
2008-07-220 ppb110 ppb
2008-07-211.35 ppb201.2 to 1.5 ppb
2008-07-150 ppb220 ppb
2008-07-140.8 ppb210 to 1.6 ppb
2008-07-080 ppb110 ppb
2008-07-070.9 ppb210 to 1.8 ppb
2008-07-021.18 ppb730 to 2.32 ppb
2008-07-010.54 ppb970 to 4.3 ppb
2008-06-240 ppb220 ppb
2008-06-230.85 ppb210 to 1.7 ppb
2008-06-180 ppb110 ppb
2008-06-170 ppb330 ppb
2008-06-160.8 ppb210 to 1.6 ppb
2008-06-113.33 ppb320 to 10 ppb
2008-06-090.75 ppb210 to 1.5 ppb
2008-06-045.34 ppb400.84 to 10.2 ppb
2008-06-030 ppb660 ppb
2008-06-020.75 ppb210 to 1.5 ppb
2008-05-300 ppb110 ppb
2008-05-284.13 ppb320 to 12.4 ppb
2008-05-271.6 ppb201.2 to 2 ppb
2008-05-190.41 ppb210 to 0.82 ppb
2008-05-140.23 ppb320 to 0.68 ppb
2008-05-120.85 ppb210 to 1.7 ppb
2008-05-080 ppb220 ppb
2008-05-070 ppb330 ppb
2008-05-064.03 ppb410 to 8.8 ppb
2008-05-050.9 ppb210 to 1.8 ppb
2008-05-011.46 ppb300.67 to 3 ppb
2008-04-290 ppb330 ppb
2008-04-281.05 ppb210 to 2.1 ppb
2008-04-240 ppb110 ppb
2008-04-230 ppb110 ppb
2008-04-211.1 ppb210 to 2.2 ppb
2008-04-150 ppb220 ppb
2008-04-140.9 ppb210 to 1.8 ppb
2008-04-080 ppb110 ppb
2008-04-070.38 ppb540 to 1.9 ppb
2008-04-021.91 ppb840 to 7.55 ppb
2008-04-010.5 ppb430 to 2 ppb
2008-03-260.74 ppb100.74 ppb
2008-03-251.07 ppb320 to 3.2 ppb
2008-03-240.85 ppb210 to 1.7 ppb
2008-03-190 ppb110 ppb
2008-03-170.95 ppb210 to 1.9 ppb
2008-03-110 ppb330 ppb
2008-03-100.8 ppb210 to 1.6 ppb
2008-03-056.08 ppb204.55 to 7.6 ppb
2008-03-040 ppb330 ppb
2008-03-031.38 ppb200.96 to 1.8 ppb
2008-02-260 ppb330 ppb
2008-02-251.3 ppb210 to 2.59 ppb
2008-02-200 ppb110 ppb
2008-02-191 ppb210 to 2 ppb
2008-02-130 ppb330 ppb
2008-02-120 ppb110 ppb
2008-02-112 ppb201.6 to 2.4 ppb
2008-02-067.3 ppb205.56 to 9.03 ppb
2008-02-040.55 ppb430 to 2.2 ppb
2008-01-310 ppb110 ppb
2008-01-290 ppb110 ppb
2008-01-280.7 ppb320 to 2.1 ppb
2008-01-240 ppb110 ppb
2008-01-230 ppb330 ppb
2008-01-221.25 ppb210 to 2.5 ppb
2008-01-160 ppb220 ppb
2008-01-150 ppb110 ppb
2008-01-140.95 ppb210 to 1.89 ppb
2008-01-090 ppb220 ppb
2008-01-080 ppb550 ppb
2008-01-071.92 ppb510 to 2.7 ppb
2008-01-021.82 ppb830 to 8.04 ppb
2007-12-310.8 ppb320 to 2.4 ppb
2007-12-260.46 ppb430 to 1.83 ppb
2007-12-190 ppb110 ppb
2007-12-170.95 ppb210 to 1.9 ppb
2007-12-120 ppb110 ppb
2007-12-100.85 ppb210 to 1.7 ppb
2007-12-050 ppb330 ppb
2007-12-042.36 ppb530 to 7.9 ppb
2007-12-030.98 ppb200.56 to 1.4 ppb
2007-11-270 ppb110 ppb
2007-11-260.8 ppb210 to 1.6 ppb
2007-11-200 ppb110 ppb
2007-11-190.9 ppb210 to 1.8 ppb
2007-11-140 ppb110 ppb
2007-11-130.85 ppb210 to 1.7 ppb
2007-11-070 ppb110 ppb
2007-11-064.73 ppb301.6 to 8.6 ppb
2007-11-020 ppb440 ppb
2007-10-300.43 ppb430 to 1.7 ppb
2007-10-230.7 ppb210 to 1.4 ppb
2007-10-170.55 ppb320 to 1.66 ppb
2007-10-161.2 ppb101.2 ppb
2007-10-101.37 ppb420 to 4.68 ppb
2007-10-094.22 ppb620 to 10 ppb
2007-10-030.79 ppb530 to 3.26 ppb
2007-10-020.1 ppb650 to 0.61 ppb
2007-09-260 ppb220 ppb
2007-09-251.3 ppb210 to 2.6 ppb
2007-09-181 ppb420 to 2.8 ppb
2007-09-134.83 ppb410 to 11 ppb
2007-09-110.65 ppb430 to 2.6 ppb
2007-09-052.46 ppb950 to 15.2 ppb
2007-08-290.19 ppb430 to 0.76 ppb
2007-08-220 ppb440 ppb
2007-08-150.43 ppb210 to 0.86 ppb
2007-08-141.18 ppb200.75 to 1.6 ppb
2007-08-080.29 ppb650 to 1.76 ppb
2007-08-075.1 ppb710 to 13 ppb
2007-08-010 ppb110 ppb
2007-07-311.33 ppb420 to 2.7 ppb
2007-07-251.34 ppb310 to 2.26 ppb
2007-07-240 ppb110 ppb
2007-07-171.13 ppb420 to 2.3 ppb
2007-07-115.42 ppb410 to 14.9 ppb
2007-07-101.65 ppb1060 to 10 ppb
2007-07-030.94 ppb1160 to 2.5 ppb
2007-06-260.78 ppb530 to 2.6 ppb
2007-06-252.6 ppb102.6 ppb
2007-06-190.68 ppb430 to 2.7 ppb
2007-06-130.51 ppb210 to 1.02 ppb
2007-06-120.98 ppb420 to 2.6 ppb
2007-06-070 ppb110 ppb
2007-06-062.1 ppb850 to 12 ppb
2007-06-055.11 ppb600.68 to 12 ppb
2007-05-301.18 ppb420 to 3.4 ppb
2007-05-220.51 ppb420 to 1.4 ppb
2007-05-160 ppb110 ppb
2007-05-151.2 ppb320 to 3.6 ppb
2007-05-100 ppb110 ppb
2007-05-091.5 ppb310 to 3.4 ppb
2007-05-085 ppb105 ppb
2007-05-023.33 ppb1140 to 11.5 ppb
2007-05-010.6 ppb540 to 3 ppb
2007-04-240.48 ppb430 to 1.9 ppb
2007-04-170.66 ppb540 to 3.3 ppb
2007-04-120 ppb110 ppb
2007-04-116 ppb204.3 to 7.7 ppb
2007-04-100.9 ppb430 to 3.6 ppb
2007-04-060 ppb110 ppb
2007-04-053.56 ppb200.92 to 6.2 ppb
2007-04-0414 ppb1014 ppb
2007-04-030.4 ppb540 to 2 ppb
2007-03-270.5 ppb430 to 2 ppb
2007-03-200.45 ppb430 to 1.8 ppb
2007-03-140.6 ppb430 to 2.4 ppb
2007-03-130 ppb220 ppb
2007-03-092.3 ppb102.3 ppb
2007-03-072.58 ppb620 to 9.5 ppb
2007-03-060.38 ppb540 to 1.9 ppb
2007-02-270.43 ppb430 to 1.7 ppb
2007-02-210.53 ppb430 to 2.1 ppb
2007-02-140.43 ppb430 to 1.7 ppb
2007-02-080 ppb110 ppb
2007-02-073.33 ppb320 to 10 ppb
2007-02-060.59 ppb530 to 2.2 ppb
2007-01-301.55 ppb201.4 to 1.7 ppb
2007-01-260 ppb220 ppb
2007-01-245.5 ppb301.4 to 12.5 ppb
2007-01-231 ppb101 ppb
2007-01-220 ppb220 ppb
2007-01-181.97 ppb1050 to 7.4 ppb
2007-01-170.58 ppb430 to 2.3 ppb
2007-01-110 ppb110 ppb
2007-01-101.98 ppb850 to 12.3 ppb
2007-01-090 ppb660 ppb
2007-01-031.3 ppb940 to 2.6 ppb
2006-12-280.55 ppb430 to 2.2 ppb
2006-12-210 ppb220 ppb
2006-12-194.55 ppb401.1 to 8.7 ppb
2006-12-136.6 ppb106.6 ppb
2006-12-121.08 ppb420 to 2.2 ppb
2006-12-060 ppb550 ppb
2006-12-054.47 ppb310 to 11 ppb
2006-11-270.58 ppb430 to 2.3 ppb
2006-11-210 ppb220 ppb
2006-11-200.9 ppb210 to 1.8 ppb
2006-11-154.27 ppb310 to 10.3 ppb
2006-11-140 ppb220 ppb
2006-11-080 ppb220 ppb
2006-11-070.8 ppb320 to 2.4 ppb
2006-11-010 ppb220 ppb
2006-10-310.6 ppb430 to 2.4 ppb
2006-10-258.15 ppb200.8 to 15.5 ppb
2006-10-240.43 ppb430 to 1.7 ppb
2006-10-183.2 ppb320 to 9.6 ppb
2006-10-170.67 ppb320 to 2 ppb
2006-10-110 ppb220 ppb
2006-10-100.4 ppb320 to 1.2 ppb
2006-10-042.3 ppb320 to 6.9 ppb
2006-10-030.26 ppb540 to 1.3 ppb
2006-09-260.35 ppb430 to 1.4 ppb
2006-09-200 ppb110 ppb
2006-09-190.4 ppb320 to 1.2 ppb
2006-09-130 ppb110 ppb
2006-09-120.3 ppb540 to 1.5 ppb
2006-09-076.6 ppb106.6 ppb
2006-08-290.3 ppb430 to 1.2 ppb
2006-08-230 ppb110 ppb
2006-08-220.43 ppb320 to 1.3 ppb
2006-08-160 ppb110 ppb
2006-08-150.57 ppb320 to 1.7 ppb
2006-08-090 ppb110 ppb
2006-08-082.58 ppb420 to 8.5 ppb
2006-08-020.12 ppb540 to 0.6 ppb
2006-08-010 ppb220 ppb
2006-07-260 ppb220 ppb
2006-07-251.05 ppb210 to 2.1 ppb
2006-07-200 ppb110 ppb
2006-07-194.3 ppb320 to 12.9 ppb
2006-07-180.27 ppb760 to 1.9 ppb
2006-07-120 ppb660 ppb
2006-07-110.31 ppb1190 to 2.4 ppb
2006-07-050.48 ppb950 to 1.2 ppb
2006-06-270.25 ppb430 to 1 ppb
2006-06-210 ppb330 ppb
2006-06-200.84 ppb100.84 ppb
2006-06-140.2 ppb430 to 0.8 ppb
2006-06-070.22 ppb540 to 1.1 ppb
2006-06-060 ppb220 ppb
2006-05-300.25 ppb430 to 1 ppb
2006-05-240 ppb330 ppb
2006-05-170.23 ppb320 to 0.7 ppb
2006-05-160.9 ppb100.9 ppb
2006-05-110 ppb110 ppb
2006-05-100.27 ppb320 to 0.8 ppb
2006-05-097.3 ppb107.3 ppb
2006-05-051.6 ppb101.6 ppb
2006-05-020.73 ppb320 to 2.2 ppb
2006-04-261.6 ppb101.6 ppb
2006-04-250 ppb220 ppb
2006-04-240 ppb110 ppb
2006-04-190.68 ppb420 to 2.1 ppb
2006-04-180 ppb110 ppb
2006-04-120.7 ppb420 to 2.2 ppb
2006-04-110 ppb220 ppb
2006-04-040.36 ppb760 to 2.5 ppb
2006-03-280.77 ppb320 to 2.3 ppb
2006-03-222.6 ppb430 to 10.4 ppb
2006-03-213 ppb103 ppb
2006-03-160 ppb110 ppb
2006-03-150.58 ppb430 to 2.3 ppb
2006-03-140 ppb220 ppb
2006-03-090 ppb110 ppb
2006-03-080 ppb330 ppb
2006-03-073.85 ppb202.4 to 5.3 ppb
2006-03-020 ppb110 ppb
2006-03-010.77 ppb320 to 2.3 ppb
2006-02-2810 ppb1010 ppb
2006-02-223.28 ppb520 to 14.2 ppb
2006-02-150.33 ppb430 to 1.3 ppb
2006-02-145 ppb105 ppb
2006-02-070 ppb660 ppb
2006-02-010.82 ppb640 to 2.5 ppb
2006-01-310 ppb110 ppb
2006-01-250 ppb220 ppb
2006-01-240 ppb330 ppb
2006-01-190 ppb550 ppb
2006-01-182 ppb102 ppb
2006-01-110.45 ppb640 to 1.8 ppb
2006-01-100 ppb770 ppb
2006-01-051.51 ppb950 to 8.1 ppb
2006-01-041.86 ppb501.5 to 2.3 ppb
2005-12-280.53 ppb320 to 1.6 ppb
2005-12-210.57 ppb320 to 1.7 ppb
2005-12-150 ppb220 ppb
2005-12-142.38 ppb420 to 7.9 ppb
2005-12-136.85 ppb201.7 to 12 ppb
2005-12-080 ppb110 ppb
2005-12-074.4 ppb104.4 ppb
2005-12-060.48 ppb210 to 0.96 ppb
2005-11-290.56 ppb310 to 1.1 ppb
2005-11-220.51 ppb310 to 0.97 ppb
2005-11-150.26 ppb540 to 1.3 ppb
2005-11-080.55 ppb210 to 1.1 ppb
2005-11-022.65 ppb201.1 to 4.2 ppb
2005-11-010 ppb220 ppb
2005-10-2713 ppb1013 ppb
2005-10-261.7 ppb201.2 to 2.2 ppb
2005-10-250 ppb220 ppb
2005-10-2011 ppb1011 ppb
2005-10-190.4 ppb320 to 1.2 ppb
2005-10-180.46 ppb210 to 0.92 ppb
2005-10-110.33 ppb320 to 1 ppb
2005-10-054.1 ppb104.1 ppb
2005-10-040.19 ppb540 to 0.94 ppb
2005-09-280 ppb220 ppb
2005-09-273.4 ppb520 to 13 ppb
2005-09-210.37 ppb530 to 1 ppb
2005-09-200 ppb220 ppb
2005-09-130.32 ppb320 to 0.95 ppb
2005-09-080 ppb220 ppb
2005-09-071.57 ppb320 to 4.7 ppb
2005-09-060.82 ppb100.82 ppb
2005-08-310.72 ppb100.72 ppb
2005-08-300 ppb440 ppb
2005-08-250.6 ppb100.6 ppb
2005-08-180.32 ppb210 to 0.63 ppb
2005-08-160 ppb110 ppb
2005-08-120 ppb220 ppb
2005-08-1012 ppb1012 ppb
2005-08-090.33 ppb320 to 0.98 ppb
2005-08-031.55 ppb210 to 3.1 ppb
2005-08-020.13 ppb430 to 0.51 ppb
2005-07-260 ppb660 ppb
2005-07-200 ppb220 ppb
2005-07-190 ppb550 ppb
2005-07-130 ppb440 ppb
2005-07-120 ppb220 ppb
2005-07-070 ppb220 ppb
2005-07-068.75 ppb205.5 to 12 ppb
2005-07-052.6 ppb201.7 to 3.5 ppb
2005-06-290 ppb220 ppb
2005-06-280.65 ppb310 to 1.4 ppb
2005-06-220 ppb220 ppb
2005-06-210.47 ppb320 to 1.4 ppb
2005-06-150.44 ppb210 to 0.88 ppb
2005-06-141.8 ppb101.8 ppb
2005-06-080 ppb550 ppb
2005-06-071 ppb200.5 to 1.5 ppb
2005-06-023.06 ppb830 to 14 ppb
2005-06-011.5 ppb101.5 ppb
2005-05-240.36 ppb540 to 1.8 ppb
2005-05-190 ppb330 ppb
2005-05-170.67 ppb310 to 1.5 ppb
2005-05-100.45 ppb530 to 1.6 ppb
2005-05-050.8 ppb210 to 1.6 ppb
2005-05-040.23 ppb320 to 0.68 ppb
2005-05-038.93 ppb301.8 to 14 ppb
2005-04-280 ppb110 ppb
2005-04-251.26 ppb200.52 to 2 ppb
2005-04-190.4 ppb430 to 1.6 ppb
2005-04-130.85 ppb210 to 1.7 ppb
2005-04-121.9 ppb320 to 5.7 ppb
2005-04-065.38 ppb402 to 11 ppb
2005-04-051.41 ppb200.92 to 1.9 ppb
2005-03-281.2 ppb200.69 to 1.7 ppb
2005-03-231.65 ppb201.1 to 2.2 ppb
2005-03-161.24 ppb200.57 to 1.9 ppb
2005-03-021.02 ppb540 to 5.1 ppb
2005-03-011.8 ppb201.7 to 1.9 ppb
2005-02-241.8 ppb201.4 to 2.2 ppb
2005-02-090.57 ppb320 to 1.7 ppb
2005-02-030 ppb330 ppb
2005-02-021.31 ppb200.91 to 1.7 ppb
2005-02-015.8 ppb402.7 to 12 ppb
2005-01-260 ppb110 ppb
2005-01-250.8 ppb210 to 1.6 ppb
2005-01-201.7 ppb201.5 to 1.9 ppb
2005-01-121.65 ppb201.3 to 2 ppb
2005-01-053.09 ppb1230 to 14 ppb
2004-12-281.5 ppb201.1 to 1.9 ppb
2004-12-201.4 ppb201.1 to 1.7 ppb
2004-12-150.88 ppb410 to 1.9 ppb
2004-12-081.95 ppb201.6 to 2.3 ppb
2004-12-013.66 ppb820 to 14 ppb
2004-11-221.2 ppb210 to 2.4 ppb
2004-11-171.54 ppb520 to 5 ppb
2004-11-100.34 ppb860 to 1.6 ppb
2004-11-031.7 ppb410 to 3.6 ppb
2004-10-270.7 ppb210 to 1.4 ppb
2004-10-250 ppb110 ppb
2004-10-220 ppb110 ppb
2004-10-200.53 ppb320 to 1.6 ppb
2004-10-064.2 ppb610 to 12 ppb
2004-09-290.7 ppb210 to 1.4 ppb
2004-09-221.83 ppb310 to 2.9 ppb
2004-09-151.2 ppb210 to 2.4 ppb
2004-09-081.1 ppb210 to 2.2 ppb
2004-09-014.82 ppb510 to 13 ppb
2004-08-251.7 ppb201.4 to 2 ppb
2004-08-184.8 ppb410 to 11 ppb
2004-08-111.6 ppb201.2 to 2 ppb
2004-08-041.97 ppb301.1 to 2.9 ppb
2004-07-281.55 ppb201.2 to 1.9 ppb
2004-07-210.8 ppb210 to 1.6 ppb
2004-07-144.73 ppb410 to 12 ppb
2004-07-071.93 ppb310 to 3.6 ppb
2004-06-301.45 ppb201 to 1.9 ppb
2004-06-230.9 ppb210 to 1.8 ppb
2004-06-161 ppb210 to 2 ppb
2004-06-150 ppb110 ppb
2004-06-090.95 ppb210 to 1.9 ppb
2004-06-039.35 ppb206.7 to 12 ppb
2004-06-022.16 ppb300.79 to 3.4 ppb
2004-05-300 ppb110 ppb
2004-05-261.8 ppb201.5 to 2.1 ppb
2004-05-191 ppb210 to 2 ppb
2004-05-1320 ppb+1020 ppb
2004-05-121.07 ppb310 to 1.9 ppb
2004-05-054.7 ppb510 to 13 ppb
2004-04-280.95 ppb210 to 1.9 ppb
2004-04-210.9 ppb310 to 2.2 ppb
2004-04-140.83 ppb310 to 1.7 ppb
2004-04-087.1 ppb303.3 to 12 ppb
2004-04-071.13 ppb310 to 2 ppb
2004-04-020 ppb110 ppb
2004-03-311.02 ppb310 to 2.1 ppb
2004-03-241.33 ppb200.76 to 1.9 ppb
2004-03-171.75 ppb201.1 to 2.4 ppb
2004-03-101.31 ppb200.81 to 1.8 ppb
2004-03-032.61 ppb940 to 12 ppb
2004-02-251.55 ppb201.4 to 1.7 ppb
2004-02-180.85 ppb210 to 1.7 ppb
2004-02-110.9 ppb210 to 1.8 ppb
2004-02-041.35 ppb210 to 2.7 ppb
2004-02-035.1 ppb105.1 ppb
2004-02-027.6 ppb203.2 to 12 ppb
2004-01-271.3 ppb210 to 2.6 ppb
2004-01-200 ppb220 ppb
2004-01-131.1 ppb210 to 2.2 ppb
2004-01-062.78 ppb601.1 to 5.1 ppb
2004-01-056.85 ppb202.7 to 11 ppb