The Power of Information

National Drinking Water Database


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


Serves 156,500 people

Trichloroethylene

Trichloroethylene is used to remove grease from fabricated metal parts and in the production of some textiles; this pollutant comes from metal degreasing sites, metal finishing and rubber processing industries.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
401 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)
46 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
1,429 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
TrichloroethyleneTrichloroethylene is used to remove grease from fabricated metal parts and in the production of some textiles; this pollutant comes from metal degreasing sites, metal finishing and rubber processing industries.1.87 ppb
11.67 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 Trichloroethylene

Health Based Limits for Trichloroethylene

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
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.0.03 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.1.7 ppb
One in one million (10-6) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 1,000,000. Source: U.S. Environmental Protection Agency.3 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
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.200 ppb
One in ten thousand (10-4) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 10,000. Source: U.S. Environmental Protection Agency.300 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-04-020.9 ppb210 to 1.8 ppb
2009-03-312.75 ppb202.5 to 3 ppb
2009-03-252.31 ppb202 to 2.61 ppb
2009-03-161.8 ppb201.3 to 2.3 ppb
2009-03-112.43 ppb401.5 to 4.08 ppb
2009-03-021.7 ppb200.99 to 2.4 ppb
2009-02-232.25 ppb202.1 to 2.4 ppb
2009-02-183.48 ppb302.34 to 4.99 ppb
2009-02-110.92 ppb210 to 1.83 ppb
2009-02-102.4 ppb202.2 to 2.6 ppb
2009-02-054.1 ppb203.1 to 5.1 ppb
2009-02-041.48 ppb410 to 3.1 ppb
2009-02-022.07 ppb201.72 to 2.41 ppb
2009-01-261.65 ppb201.5 to 1.8 ppb
2009-01-233.7 ppb103.7 ppb
2009-01-211.42 ppb310 to 2.13 ppb
2009-01-200 ppb110 ppb
2009-01-152.05 ppb210 to 4.1 ppb
2009-01-140.86 ppb210 to 1.71 ppb
2009-01-132.35 ppb202.2 to 2.5 ppb
2009-01-071.94 ppb530 to 6.48 ppb
2009-01-060.95 ppb730 to 3.2 ppb
2009-01-052.6 ppb502 to 2.9 ppb
2008-12-302.83 ppb301.8 to 4.1 ppb
2008-12-231.8 ppb410 to 3.1 ppb
2008-12-160.6 ppb320 to 1.8 ppb
2008-12-113.45 ppb201 to 5.9 ppb
2008-12-100 ppb110 ppb
2008-12-081.05 ppb210 to 2.1 ppb
2008-12-030 ppb110 ppb
2008-12-023.5 ppb403.2 to 3.9 ppb
2008-12-011.1 ppb210 to 2.2 ppb
2008-11-240.7 ppb320 to 2.1 ppb
2008-11-190 ppb110 ppb
2008-11-171.1 ppb210 to 2.2 ppb
2008-11-121.74 ppb310 to 4.48 ppb
2008-11-100.8 ppb210 to 1.6 ppb
2008-11-052.29 ppb310 to 3.74 ppb
2008-11-032.45 ppb202.1 to 2.8 ppb
2008-10-290 ppb220 ppb
2008-10-284.2 ppb104.2 ppb
2008-10-272.05 ppb201.2 to 2.9 ppb
2008-10-220 ppb220 ppb
2008-10-202.05 ppb201.3 to 2.8 ppb
2008-10-160.49 ppb210 to 0.97 ppb
2008-10-150 ppb220 ppb
2008-10-132 ppb201.2 to 2.8 ppb
2008-10-082.07 ppb620 to 5.42 ppb
2008-10-062.1 ppb201.3 to 2.9 ppb
2008-10-013.95 ppb601.75 to 5.58 ppb
2008-09-290.95 ppb420 to 2.8 ppb
2008-09-230 ppb220 ppb
2008-09-221.3 ppb210 to 2.6 ppb
2008-09-170 ppb220 ppb
2008-09-160.93 ppb100.93 ppb
2008-09-151.2 ppb210 to 2.4 ppb
2008-09-100 ppb220 ppb
2008-09-081.3 ppb210 to 2.6 ppb
2008-09-050 ppb110 ppb
2008-09-021.63 ppb200.86 to 2.4 ppb
2008-08-260 ppb220 ppb
2008-08-251.57 ppb200.63 to 2.5 ppb
2008-08-210 ppb110 ppb
2008-08-190 ppb220 ppb
2008-08-130.27 ppb320 to 0.82 ppb
2008-08-111.3 ppb210 to 2.6 ppb
2008-08-073.45 ppb203.3 to 3.6 ppb
2008-08-062.12 ppb520 to 4.73 ppb
2008-08-053.77 ppb301.4 to 5.7 ppb
2008-08-041.35 ppb210 to 2.7 ppb
2008-07-280.74 ppb420 to 2.3 ppb
2008-07-220 ppb110 ppb
2008-07-211.9 ppb201.6 to 2.2 ppb
2008-07-150.55 ppb210 to 1.1 ppb
2008-07-141.46 ppb200.52 to 2.4 ppb
2008-07-081 ppb101 ppb
2008-07-071.05 ppb210 to 2.1 ppb
2008-07-021.3 ppb730 to 2.57 ppb
2008-07-012.95 ppb910 to 5.8 ppb
2008-06-240 ppb220 ppb
2008-06-231.1 ppb210 to 2.2 ppb
2008-06-180 ppb110 ppb
2008-06-171.1 ppb310 to 2.2 ppb
2008-06-161 ppb210 to 2 ppb
2008-06-111.4 ppb320 to 4.2 ppb
2008-06-090.95 ppb210 to 1.9 ppb
2008-06-044.72 ppb403.24 to 6.73 ppb
2008-06-031.55 ppb630 to 4 ppb
2008-06-020.95 ppb210 to 1.9 ppb
2008-05-300 ppb110 ppb
2008-05-282.38 ppb310 to 4.46 ppb
2008-05-271.85 ppb201.5 to 2.2 ppb
2008-05-190.7 ppb210 to 1.4 ppb
2008-05-1415.18 ppb+320 to 45.55 ppb
2008-05-121.1 ppb210 to 2.2 ppb
2008-05-080.95 ppb210 to 1.9 ppb
2008-05-072.07 ppb310 to 3.34 ppb
2008-05-065.33 ppb401.6 to 11 ppb
2008-05-051.45 ppb210 to 2.9 ppb
2008-05-015.77 ppb301 to 15 ppb
2008-04-290.47 ppb320 to 1.4 ppb
2008-04-282.25 ppb210 to 4.5 ppb
2008-04-240 ppb110 ppb
2008-04-230 ppb110 ppb
2008-04-211.6 ppb210 to 3.2 ppb
2008-04-150 ppb220 ppb
2008-04-141.3 ppb210 to 2.6 ppb
2008-04-080 ppb110 ppb
2008-04-072.26 ppb520 to 4.4 ppb
2008-04-021.58 ppb820 to 4.16 ppb
2008-04-011 ppb420 to 2.1 ppb
2008-03-264.4 ppb104.4 ppb
2008-03-252.47 ppb320 to 7.4 ppb
2008-03-241.1 ppb210 to 2.2 ppb
2008-03-190 ppb110 ppb
2008-03-171.05 ppb210 to 2.1 ppb
2008-03-111.27 ppb320 to 3.8 ppb
2008-03-100.9 ppb210 to 1.8 ppb
2008-03-053.02 ppb202.12 to 3.92 ppb
2008-03-041.13 ppb310 to 2.1 ppb
2008-03-031.36 ppb200.91 to 1.8 ppb
2008-02-261.73 ppb320 to 5.2 ppb
2008-02-250.98 ppb210 to 1.95 ppb
2008-02-200 ppb110 ppb
2008-02-191 ppb210 to 2 ppb
2008-02-130.58 ppb310 to 0.91 ppb
2008-02-120 ppb110 ppb
2008-02-111.8 ppb201.4 to 2.2 ppb
2008-02-063.51 ppb202.39 to 4.62 ppb
2008-02-040.93 ppb420 to 2 ppb
2008-01-310 ppb110 ppb
2008-01-290 ppb110 ppb
2008-01-280.63 ppb320 to 1.9 ppb
2008-01-240 ppb110 ppb
2008-01-230 ppb330 ppb
2008-01-220.93 ppb210 to 1.86 ppb
2008-01-160 ppb220 ppb
2008-01-150 ppb110 ppb
2008-01-140.61 ppb210 to 1.21 ppb
2008-01-090.7 ppb210 to 1.39 ppb
2008-01-081.94 ppb510 to 3.6 ppb
2008-01-071.55 ppb510 to 2.09 ppb
2008-01-021.6 ppb830 to 5.64 ppb
2007-12-310.83 ppb320 to 2.5 ppb
2007-12-260.37 ppb430 to 1.46 ppb
2007-12-190 ppb110 ppb
2007-12-171.25 ppb210 to 2.5 ppb
2007-12-120 ppb110 ppb
2007-12-101.15 ppb210 to 2.3 ppb
2007-12-050.43 ppb320 to 1.29 ppb
2007-12-043.56 ppb502.3 to 5 ppb
2007-12-030.95 ppb200.7 to 1.2 ppb
2007-11-270 ppb110 ppb
2007-11-261.05 ppb210 to 2.1 ppb
2007-11-200 ppb110 ppb
2007-11-191.15 ppb210 to 2.3 ppb
2007-11-140 ppb110 ppb
2007-11-131.2 ppb210 to 2.4 ppb
2007-11-070 ppb110 ppb
2007-11-063.53 ppb302.2 to 5.6 ppb
2007-11-023 ppb401.7 to 4.1 ppb
2007-10-300.53 ppb430 to 2.1 ppb
2007-10-231.36 ppb200.52 to 2.2 ppb
2007-10-170.44 ppb320 to 1.33 ppb
2007-10-161.8 ppb101.8 ppb
2007-10-101.21 ppb420 to 4.17 ppb
2007-10-094.77 ppb601.3 to 11 ppb
2007-10-031 ppb520 to 2.82 ppb
2007-10-021.91 ppb610 to 4 ppb
2007-09-260 ppb220 ppb
2007-09-251.45 ppb210 to 2.9 ppb
2007-09-181 ppb420 to 2.9 ppb
2007-09-135.5 ppb402.8 to 9 ppb
2007-09-110.7 ppb430 to 2.8 ppb
2007-09-052.99 ppb920 to 6.4 ppb
2007-08-290.22 ppb430 to 0.86 ppb
2007-08-220.2 ppb430 to 0.81 ppb
2007-08-150.57 ppb210 to 1.14 ppb
2007-08-141.31 ppb200.81 to 1.8 ppb
2007-08-082.24 ppb620 to 4.85 ppb
2007-08-074.71 ppb702.7 to 9.7 ppb
2007-08-013.25 ppb103.25 ppb
2007-07-311.3 ppb420 to 2.6 ppb
2007-07-251.33 ppb310 to 2.24 ppb
2007-07-240 ppb110 ppb
2007-07-171.25 ppb420 to 2.5 ppb
2007-07-113.52 ppb400.8 to 5.8 ppb
2007-07-102.77 ppb1010 to 8.6 ppb
2007-07-031.95 ppb1130 to 4.1 ppb
2007-06-261.6 ppb520 to 3.5 ppb
2007-06-252.9 ppb102.9 ppb
2007-06-191.25 ppb430 to 5 ppb
2007-06-1318.2 ppb+210 to 36.4 ppb
2007-06-121.73 ppb420 to 4.7 ppb
2007-06-074.2 ppb104.2 ppb
2007-06-062.79 ppb820 to 5 ppb
2007-06-057.97 ppb603.2 to 14 ppb
2007-05-301.45 ppb420 to 4.2 ppb
2007-05-220.89 ppb420 to 2.6 ppb
2007-05-160 ppb110 ppb
2007-05-151.2 ppb320 to 3.6 ppb
2007-05-100 ppb110 ppb
2007-05-091.73 ppb310 to 3.8 ppb
2007-05-0811 ppb1011 ppb
2007-05-028.06 ppb1102.5 to 37.2 ppb
2007-05-011.26 ppb530 to 4.1 ppb
2007-04-240.4 ppb430 to 1.6 ppb
2007-04-170.6 ppb540 to 3 ppb
2007-04-120.99 ppb100.99 ppb
2007-04-116.5 ppb206.5 ppb
2007-04-101.1 ppb430 to 4.4 ppb
2007-04-060 ppb110 ppb
2007-04-058.65 ppb208 to 9.3 ppb
2007-04-044 ppb104 ppb
2007-04-031.02 ppb530 to 2.7 ppb
2007-03-270.58 ppb430 to 2.3 ppb
2007-03-200.77 ppb420 to 2.5 ppb
2007-03-140.6 ppb430 to 2.4 ppb
2007-03-135.85 ppb205.7 to 6 ppb
2007-03-0910 ppb1010 ppb
2007-03-073.25 ppb610 to 9.1 ppb
2007-03-060.72 ppb530 to 2.3 ppb
2007-02-270.3 ppb430 to 1.2 ppb
2007-02-210.33 ppb430 to 1.3 ppb
2007-02-140.28 ppb430 to 1.1 ppb
2007-02-080 ppb110 ppb
2007-02-074.07 ppb302.4 to 5.1 ppb
2007-02-061.06 ppb520 to 2.4 ppb
2007-01-301.5 ppb201.3 to 1.7 ppb
2007-01-260 ppb220 ppb
2007-01-243 ppb301.9 to 3.8 ppb
2007-01-2317 ppb+1017 ppb
2007-01-222.85 ppb210 to 5.7 ppb
2007-01-182.94 ppb1040 to 6.6 ppb
2007-01-170.3 ppb430 to 1.2 ppb
2007-01-110 ppb110 ppb
2007-01-100.98 ppb830 to 2.6 ppb
2007-01-091.57 ppb640 to 4.7 ppb
2007-01-030.92 ppb930 to 2.4 ppb
2006-12-280.33 ppb430 to 1.3 ppb
2006-12-210 ppb220 ppb
2006-12-194.37 ppb400.98 to 6.7 ppb
2006-12-131.4 ppb101.4 ppb
2006-12-120.73 ppb420 to 1.5 ppb
2006-12-062.28 ppb520 to 4.7 ppb
2006-12-051.27 ppb310 to 2.1 ppb
2006-11-270.28 ppb430 to 1.1 ppb
2006-11-210 ppb220 ppb
2006-11-200.8 ppb210 to 1.6 ppb
2006-11-151.23 ppb310 to 2 ppb
2006-11-140 ppb220 ppb
2006-11-080 ppb220 ppb
2006-11-071.23 ppb310 to 2.5 ppb
2006-11-015.05 ppb204.8 to 5.3 ppb
2006-10-310.45 ppb430 to 1.8 ppb
2006-10-254.9 ppb203.1 to 6.7 ppb
2006-10-240.73 ppb430 to 2.9 ppb
2006-10-186.3 ppb310 to 13.1 ppb
2006-10-170.73 ppb320 to 2.2 ppb
2006-10-114.85 ppb210 to 9.7 ppb
2006-10-100.6 ppb320 to 1.8 ppb
2006-10-044.97 ppb304.5 to 5.7 ppb
2006-10-030.86 ppb530 to 2.3 ppb
2006-09-260.55 ppb430 to 2.2 ppb
2006-09-200 ppb110 ppb
2006-09-190.73 ppb320 to 2.2 ppb
2006-09-130 ppb110 ppb
2006-09-122.52 ppb520 to 5.2 ppb
2006-09-076.2 ppb106.2 ppb
2006-08-290.45 ppb430 to 1.8 ppb
2006-08-230 ppb110 ppb
2006-08-220.67 ppb320 to 2 ppb
2006-08-160 ppb110 ppb
2006-08-150.7 ppb320 to 2.1 ppb
2006-08-090 ppb110 ppb
2006-08-082.63 ppb420 to 8.1 ppb
2006-08-020.62 ppb530 to 1.9 ppb
2006-08-015.15 ppb205 to 5.3 ppb
2006-07-260 ppb220 ppb
2006-07-250.65 ppb210 to 1.3 ppb
2006-07-200 ppb110 ppb
2006-07-190.7 ppb320 to 2.1 ppb
2006-07-180.23 ppb760 to 1.6 ppb
2006-07-120.18 ppb650 to 1.1 ppb
2006-07-111.79 ppb1150 to 6.2 ppb
2006-07-051.01 ppb940 to 1.9 ppb
2006-06-270.55 ppb430 to 2.2 ppb
2006-06-210 ppb330 ppb
2006-06-202.4 ppb102.4 ppb
2006-06-140.45 ppb430 to 1.8 ppb
2006-06-070.84 ppb530 to 2.2 ppb
2006-06-066 ppb205.9 to 6.1 ppb
2006-05-300.48 ppb430 to 1.9 ppb
2006-05-240 ppb330 ppb
2006-05-170.37 ppb320 to 1.1 ppb
2006-05-162.2 ppb102.2 ppb
2006-05-110 ppb110 ppb
2006-05-100.63 ppb320 to 1.9 ppb
2006-05-097.6 ppb107.6 ppb
2006-05-052.1 ppb102.1 ppb
2006-05-020.8 ppb320 to 2.4 ppb
2006-04-261.6 ppb101.6 ppb
2006-04-250 ppb220 ppb
2006-04-240 ppb110 ppb
2006-04-190.63 ppb420 to 1.9 ppb
2006-04-180 ppb110 ppb
2006-04-120.5 ppb430 to 2 ppb
2006-04-114.3 ppb204 to 4.6 ppb
2006-04-040.69 ppb750 to 2.6 ppb
2006-03-280.67 ppb320 to 2 ppb
2006-03-221.65 ppb430 to 6.6 ppb
2006-03-212.8 ppb102.8 ppb
2006-03-160 ppb110 ppb
2006-03-156.85 ppb420 to 21.5 ppb
2006-03-146.1 ppb206 to 6.2 ppb
2006-03-090 ppb110 ppb
2006-03-080.67 ppb320 to 2 ppb
2006-03-074.4 ppb203 to 5.8 ppb
2006-03-020 ppb110 ppb
2006-03-010.93 ppb320 to 2.8 ppb
2006-02-285.3 ppb105.3 ppb
2006-02-221.8 ppb520 to 3.6 ppb
2006-02-151.88 ppb420 to 5.8 ppb
2006-02-145.8 ppb105.8 ppb
2006-02-071.15 ppb630 to 4.5 ppb
2006-02-015.67 ppb610 to 20.1 ppb
2006-01-310 ppb110 ppb
2006-01-250 ppb220 ppb
2006-01-242.32 ppb310 to 6.2 ppb
2006-01-190 ppb550 ppb
2006-01-183.3 ppb103.3 ppb
2006-01-113.4 ppb610 to 8.4 ppb
2006-01-100 ppb770 ppb
2006-01-052.91 ppb920 to 9.9 ppb
2006-01-043.84 ppb503.3 to 4.4 ppb
2005-12-281.54 ppb310 to 3.8 ppb
2005-12-211.17 ppb320 to 3.5 ppb
2005-12-155.8 ppb205.6 to 6 ppb
2005-12-142.47 ppb410 to 5.5 ppb
2005-12-135.5 ppb203.8 to 7.2 ppb
2005-12-080 ppb110 ppb
2005-12-076 ppb106 ppb
2005-12-061.79 ppb200.67 to 2.9 ppb
2005-11-291.53 ppb310 to 3.1 ppb
2005-11-221.37 ppb310 to 2.8 ppb
2005-11-153.12 ppb520 to 6.2 ppb
2005-11-081.55 ppb210 to 3.1 ppb
2005-11-024.4 ppb202.9 to 5.9 ppb
2005-11-010 ppb220 ppb
2005-10-273.6 ppb103.6 ppb
2005-10-265.5 ppb202.5 to 8.5 ppb
2005-10-250 ppb220 ppb
2005-10-206.3 ppb106.3 ppb
2005-10-196.57 ppb304.4 to 7.8 ppb
2005-10-181.35 ppb210 to 2.7 ppb
2005-10-111.23 ppb320 to 3.7 ppb
2005-10-057.1 ppb107.1 ppb
2005-10-040.64 ppb530 to 1.8 ppb
2005-09-281 ppb210 to 2 ppb
2005-09-273.28 ppb520 to 9.5 ppb
2005-09-213.06 ppb510 to 6.4 ppb
2005-09-200.7 ppb210 to 1.4 ppb
2005-09-131.1 ppb320 to 3.3 ppb
2005-09-080 ppb220 ppb
2005-09-073.67 ppb310 to 8.8 ppb
2005-09-062.9 ppb102.9 ppb
2005-08-312.8 ppb102.8 ppb
2005-08-300.5 ppb430 to 2 ppb
2005-08-252.7 ppb102.7 ppb
2005-08-181.05 ppb210 to 2.1 ppb
2005-08-160.73 ppb100.73 ppb
2005-08-120.95 ppb210 to 1.9 ppb
2005-08-106.7 ppb106.7 ppb
2005-08-091.23 ppb320 to 3.7 ppb
2005-08-037.15 ppb201.3 to 13 ppb
2005-08-021.15 ppb420 to 2.8 ppb
2005-07-260.58 ppb640 to 1.8 ppb
2005-07-206.35 ppb206 to 6.7 ppb
2005-07-190.68 ppb530 to 1.9 ppb
2005-07-130.75 ppb420 to 1.6 ppb
2005-07-120 ppb220 ppb
2005-07-070 ppb220 ppb
2005-07-064.8 ppb204.4 to 5.2 ppb
2005-07-056.55 ppb202.1 to 11 ppb
2005-06-290 ppb220 ppb
2005-06-280.84 ppb310 to 1.9 ppb
2005-06-225.7 ppb205.4 to 6 ppb
2005-06-210.73 ppb320 to 2.2 ppb
2005-06-150.46 ppb210 to 0.92 ppb
2005-06-142.3 ppb102.3 ppb
2005-06-080 ppb550 ppb
2005-06-071.49 ppb200.67 to 2.3 ppb
2005-06-023.65 ppb830 to 13 ppb
2005-06-012.2 ppb102.2 ppb
2005-05-242.96 ppb520 to 6.7 ppb
2005-05-190 ppb330 ppb
2005-05-170.85 ppb310 to 2 ppb
2005-05-100.57 ppb530 to 2.1 ppb
2005-05-051.34 ppb200.68 to 2 ppb
2005-05-040.27 ppb320 to 0.81 ppb
2005-05-0311.67 ppb306.9 to 21 ppb
2005-04-280 ppb110 ppb
2005-04-251.71 ppb200.82 to 2.6 ppb
2005-04-190.63 ppb430 to 2.5 ppb
2005-04-131.1 ppb210 to 2.2 ppb
2005-04-124.33 ppb310 to 7.3 ppb
2005-04-068.28 ppb404.7 to 17 ppb
2005-04-051.75 ppb201.2 to 2.3 ppb
2005-03-281.64 ppb200.88 to 2.4 ppb
2005-03-231.6 ppb201 to 2.2 ppb
2005-03-161.72 ppb200.84 to 2.6 ppb
2005-03-021.65 ppb520 to 4.2 ppb
2005-03-012.2 ppb202.1 to 2.3 ppb
2005-02-242.1 ppb201.8 to 2.4 ppb
2005-02-090.73 ppb320 to 2.2 ppb
2005-02-033.27 ppb310 to 5.7 ppb
2005-02-021.95 ppb201.4 to 2.5 ppb
2005-02-017.25 ppb404.6 to 14 ppb
2005-01-260 ppb110 ppb
2005-01-251.25 ppb210 to 2.5 ppb
2005-01-202.55 ppb202.2 to 2.9 ppb
2005-01-122.2 ppb201.8 to 2.6 ppb
2005-01-054.1 ppb1210 to 13 ppb
2004-12-282 ppb201.3 to 2.7 ppb
2004-12-201.95 ppb201.4 to 2.5 ppb
2004-12-152.93 ppb401.1 to 5 ppb
2004-12-081.8 ppb201.6 to 2 ppb
2004-12-015.16 ppb820 to 17 ppb
2004-11-221.45 ppb210 to 2.9 ppb
2004-11-171.85 ppb520 to 5.9 ppb
2004-11-100.54 ppb860 to 2.5 ppb
2004-11-035.35 ppb410 to 16 ppb
2004-10-270.9 ppb210 to 1.8 ppb
2004-10-257.2 ppb107.2 ppb
2004-10-220 ppb110 ppb
2004-10-202.03 ppb310 to 4.1 ppb
2004-10-065.98 ppb610 to 17 ppb
2004-09-291.05 ppb210 to 2.1 ppb
2004-09-228.17 ppb310 to 21 ppb
2004-09-151.65 ppb210 to 3.3 ppb
2004-09-081.25 ppb210 to 2.5 ppb
2004-09-013.66 ppb510 to 6.2 ppb
2004-08-251.6 ppb201.1 to 2.1 ppb
2004-08-182.95 ppb410 to 4.8 ppb
2004-08-112.1 ppb201.6 to 2.6 ppb
2004-08-042.97 ppb301 to 5.7 ppb
2004-07-281.85 ppb201.3 to 2.4 ppb
2004-07-211.15 ppb210 to 2.3 ppb
2004-07-143.1 ppb410 to 5.4 ppb
2004-07-072.04 ppb520 to 6.5 ppb
2004-06-301.23 ppb410 to 2 ppb
2004-06-230.9 ppb210 to 1.8 ppb
2004-06-160.95 ppb210 to 1.9 ppb
2004-06-150 ppb110 ppb
2004-06-091.1 ppb210 to 2.2 ppb
2004-06-034.9 ppb204.8 to 5 ppb
2004-06-023.36 ppb300.68 to 6.6 ppb
2004-05-300 ppb110 ppb
2004-05-262.15 ppb201.6 to 2.7 ppb
2004-05-191.56 ppb200.51 to 2.6 ppb
2004-05-133.8 ppb103.8 ppb
2004-05-121.53 ppb310 to 2.7 ppb
2004-05-053.62 ppb510 to 6.2 ppb
2004-04-281.1 ppb210 to 2.2 ppb
2004-04-211.5 ppb300.77 to 2.9 ppb
2004-04-141.27 ppb310 to 2.6 ppb
2004-04-085.57 ppb305 to 6.2 ppb
2004-04-071.47 ppb310 to 2.6 ppb
2004-04-020 ppb110 ppb
2004-03-311.2 ppb310 to 2.5 ppb
2004-03-241.83 ppb200.96 to 2.7 ppb
2004-03-172.4 ppb201.5 to 3.3 ppb
2004-03-101.49 ppb200.87 to 2.1 ppb
2004-03-031.96 ppb930 to 5.1 ppb
2004-02-251.45 ppb201.2 to 1.7 ppb
2004-02-180.83 ppb420 to 1.7 ppb
2004-02-110.9 ppb210 to 1.8 ppb
2004-02-041.25 ppb210 to 2.5 ppb
2004-02-033.9 ppb103.9 ppb
2004-02-025.25 ppb205 to 5.5 ppb
2004-01-270.9 ppb420 to 2.2 ppb
2004-01-200.6 ppb320 to 1.8 ppb
2004-01-130.95 ppb210 to 1.9 ppb
2004-01-062.37 ppb601.2 to 3.9 ppb
2004-01-054.45 ppb204.2 to 4.7 ppb