The Power of Information

National Drinking Water Database


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


Serves 156,500 people

1,1-Dichloroethylene

Industrial chemical pollutant from manufacture of adhesives, synthetic fibers, refrigerants and plastic wraps.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
45 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)
45 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
452 days
Tests ConductedNumber of individual tests done for this contaminant
1,184 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
1,1-DichloroethyleneIndustrial chemical pollutant from manufacture of adhesives, synthetic fibers, refrigerants and plastic wraps.1.42 ppb
21 ppb
Yes
7 ppb
Yes
7 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 1,1-Dichloroethylene

Health Based Limits for 1,1-Dichloroethylene

StandardDescriptionLevel
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.7 ppb
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.7 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.10 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.330 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.1000 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
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.2000 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-04-022.25 ppb210 to 4.5 ppb
2009-03-311.1 ppb201 to 1.2 ppb
2009-03-251.78 ppb201.74 to 1.81 ppb
2009-03-161.1 ppb200.8 to 1.4 ppb
2009-03-114.8 ppb420 to 10.5 ppb
2009-03-020 ppb220 ppb
2009-02-230.31 ppb210 to 0.61 ppb
2009-02-183.46 ppb301.19 to 7.56 ppb
2009-02-110 ppb220 ppb
2009-02-100.71 ppb200.69 to 0.73 ppb
2009-02-050.7 ppb210 to 1.4 ppb
2009-02-042.55 ppb420 to 5.2 ppb
2009-02-021.26 ppb201.18 to 1.34 ppb
2009-01-260.91 ppb200.71 to 1.1 ppb
2009-01-237 ppb107 ppb
2009-01-213.01 ppb310 to 4.52 ppb
2009-01-200 ppb110 ppb
2009-01-1513 ppb210 to 26 ppb
2009-01-140 ppb220 ppb
2009-01-131.4 ppb201.3 to 1.5 ppb
2009-01-070.34 ppb540 to 1.7 ppb
2009-01-060.51 ppb760 to 3.6 ppb
2009-01-051.66 ppb501.3 to 2 ppb
2008-12-303.4 ppb301.2 to 7.2 ppb
2008-12-230.14 ppb430 to 0.54 ppb
2008-12-160.4 ppb320 to 1.2 ppb
2008-12-110.9 ppb210 to 1.8 ppb
2008-12-100.79 ppb100.79 ppb
2008-12-080 ppb220 ppb
2008-12-030 ppb110 ppb
2008-12-0222.25 ppb+420 to 49 ppb
2008-12-010.48 ppb210 to 0.96 ppb
2008-11-240.27 ppb320 to 0.81 ppb
2008-11-190 ppb110 ppb
2008-11-170.44 ppb210 to 0.87 ppb
2008-11-120 ppb330 ppb
2008-11-100.37 ppb210 to 0.73 ppb
2008-11-051.56 ppb320 to 4.67 ppb
2008-11-031.3 ppb200.99 to 1.6 ppb
2008-10-290.42 ppb210 to 0.83 ppb
2008-10-285.4 ppb105.4 ppb
2008-10-270.37 ppb210 to 0.74 ppb
2008-10-220.42 ppb210 to 0.83 ppb
2008-10-200.39 ppb210 to 0.77 ppb
2008-10-160 ppb220 ppb
2008-10-150 ppb220 ppb
2008-10-130.35 ppb210 to 0.7 ppb
2008-10-080.74 ppb640 to 3.51 ppb
2008-10-060.38 ppb210 to 0.75 ppb
2008-10-0110.41 ppb630 to 38.1 ppb
2008-09-290.19 ppb430 to 0.75 ppb
2008-09-230.25 ppb210 to 0.5 ppb
2008-09-220.37 ppb210 to 0.74 ppb
2008-09-170 ppb220 ppb
2008-09-160 ppb110 ppb
2008-09-150.35 ppb210 to 0.7 ppb
2008-09-100 ppb220 ppb
2008-09-080.49 ppb210 to 0.98 ppb
2008-09-050 ppb110 ppb
2008-09-020.34 ppb210 to 0.68 ppb
2008-08-260 ppb220 ppb
2008-08-250.37 ppb210 to 0.73 ppb
2008-08-210 ppb110 ppb
2008-08-190 ppb220 ppb
2008-08-130 ppb330 ppb
2008-08-110.42 ppb210 to 0.84 ppb
2008-08-070.95 ppb210 to 1.9 ppb
2008-08-0613.21 ppb510 to 42.8 ppb
2008-08-050 ppb330 ppb
2008-08-040.6 ppb210 to 1.2 ppb
2008-07-280.18 ppb430 to 0.71 ppb
2008-07-220 ppb110 ppb
2008-07-210.61 ppb200.5 to 0.71 ppb
2008-07-150 ppb220 ppb
2008-07-140.45 ppb210 to 0.9 ppb
2008-07-080 ppb110 ppb
2008-07-070.49 ppb210 to 0.98 ppb
2008-07-020.13 ppb760 to 0.91 ppb
2008-07-017.87 ppb960 to 39 ppb
2008-06-240 ppb220 ppb
2008-06-230.38 ppb210 to 0.76 ppb
2008-06-180 ppb110 ppb
2008-06-170 ppb330 ppb
2008-06-160.37 ppb210 to 0.73 ppb
2008-06-110 ppb330 ppb
2008-06-090.38 ppb210 to 0.75 ppb
2008-06-039.78 ppb630 to 33 ppb
2008-06-020.37 ppb210 to 0.73 ppb
2008-05-300 ppb110 ppb
2008-05-280 ppb330 ppb
2008-05-270.39 ppb210 to 0.78 ppb
2008-05-190 ppb220 ppb
2008-05-140 ppb330 ppb
2008-05-120.45 ppb210 to 0.9 ppb
2008-05-082.75 ppb210 to 5.5 ppb
2008-05-0723.3 ppb+310 to 36.1 ppb
2008-05-062.48 ppb410 to 5.5 ppb
2008-05-050.5 ppb210 to 1 ppb
2008-05-010.29 ppb320 to 0.86 ppb
2008-04-290 ppb330 ppb
2008-04-280.6 ppb210 to 1.2 ppb
2008-04-240 ppb110 ppb
2008-04-230 ppb110 ppb
2008-04-210.65 ppb210 to 1.3 ppb
2008-04-150 ppb220 ppb
2008-04-140.49 ppb210 to 0.98 ppb
2008-04-080 ppb110 ppb
2008-04-0715.8 ppb520 to 47 ppb
2008-04-021.05 ppb850 to 4.41 ppb
2008-04-011.34 ppb420 to 4.4 ppb
2008-03-260 ppb110 ppb
2008-03-250.73 ppb320 to 2.2 ppb
2008-03-240.44 ppb210 to 0.88 ppb
2008-03-190 ppb110 ppb
2008-03-170.55 ppb210 to 1.1 ppb
2008-03-1111.33 ppb320 to 34 ppb
2008-03-100.5 ppb210 to 0.99 ppb
2008-03-052.11 ppb200.85 to 3.36 ppb
2008-03-040.47 ppb320 to 1.4 ppb
2008-03-030.41 ppb210 to 0.82 ppb
2008-02-2614.67 ppb320 to 44 ppb
2008-02-250.66 ppb210 to 1.31 ppb
2008-02-200 ppb110 ppb
2008-02-190.55 ppb210 to 1.1 ppb
2008-02-130 ppb330 ppb
2008-02-120 ppb110 ppb
2008-02-110.91 ppb200.71 to 1.1 ppb
2008-02-063.24 ppb201.83 to 4.64 ppb
2008-02-041.12 ppb420 to 3.5 ppb
2008-01-310 ppb110 ppb
2008-01-290 ppb110 ppb
2008-01-280.3 ppb320 to 0.9 ppb
2008-01-240 ppb110 ppb
2008-01-230 ppb330 ppb
2008-01-220.59 ppb210 to 1.17 ppb
2008-01-160 ppb220 ppb
2008-01-150 ppb110 ppb
2008-01-140.43 ppb210 to 0.86 ppb
2008-01-090 ppb220 ppb
2008-01-088.82 ppb510 to 23 ppb
2008-01-071.29 ppb500.88 to 1.56 ppb
2008-01-020.82 ppb860 to 4.79 ppb
2007-12-310.43 ppb320 to 1.3 ppb
2007-12-260.27 ppb430 to 1.07 ppb
2007-12-190 ppb110 ppb
2007-12-170.5 ppb210 to 1 ppb
2007-12-120 ppb110 ppb
2007-12-100.46 ppb210 to 0.91 ppb
2007-12-050.77 ppb310 to 1.74 ppb
2007-12-0419.7 ppb510 to 50 ppb
2007-12-030 ppb220 ppb
2007-11-270 ppb110 ppb
2007-11-260.39 ppb210 to 0.78 ppb
2007-11-200 ppb110 ppb
2007-11-190.42 ppb210 to 0.83 ppb
2007-11-140 ppb110 ppb
2007-11-130.45 ppb210 to 0.89 ppb
2007-11-070 ppb110 ppb
2007-11-062.27 ppb300.8 to 4.8 ppb
2007-11-0221.6 ppb+410 to 45 ppb
2007-10-300.18 ppb430 to 0.71 ppb
2007-10-230.55 ppb210 to 1.1 ppb
2007-10-170.27 ppb320 to 0.81 ppb
2007-10-161 ppb101 ppb
2007-10-100.62 ppb430 to 2.49 ppb
2007-10-092 ppb620 to 6.3 ppb
2007-10-031.06 ppb530 to 3.62 ppb
2007-10-025.5 ppb650 to 33 ppb
2007-09-260 ppb220 ppb
2007-09-250.85 ppb210 to 1.7 ppb
2007-09-180.6 ppb420 to 1.7 ppb
2007-09-132.75 ppb410 to 6.8 ppb
2007-09-110.43 ppb430 to 1.7 ppb
2007-09-0512.38 ppb920 to 50.6 ppb
2007-08-290 ppb440 ppb
2007-08-220 ppb440 ppb
2007-08-150 ppb220 ppb
2007-08-140.46 ppb210 to 0.91 ppb
2007-08-0814.98 ppb610 to 44 ppb
2007-08-072.99 ppb710 to 6.9 ppb
2007-08-010 ppb110 ppb
2007-07-310.7 ppb420 to 1.4 ppb
2007-07-250.46 ppb320 to 1.37 ppb
2007-07-240 ppb110 ppb
2007-07-170.68 ppb420 to 1.4 ppb
2007-07-113.18 ppb410 to 8.53 ppb
2007-07-100.73 ppb1060 to 3.1 ppb
2007-07-036.99 ppb1140 to 37 ppb
2007-06-260.46 ppb530 to 1.6 ppb
2007-06-251.5 ppb101.5 ppb
2007-06-190.6 ppb430 to 2.4 ppb
2007-06-130.38 ppb210 to 0.76 ppb
2007-06-120.93 ppb420 to 2.5 ppb
2007-06-070 ppb110 ppb
2007-06-0614.91 ppb820 to 56.5 ppb
2007-06-052.74 ppb610 to 6.7 ppb
2007-05-300.78 ppb420 to 2.3 ppb
2007-05-220.44 ppb420 to 1.1 ppb
2007-05-160 ppb110 ppb
2007-05-150.73 ppb320 to 2.2 ppb
2007-05-100 ppb110 ppb
2007-05-091 ppb310 to 2.2 ppb
2007-05-083.4 ppb103.4 ppb
2007-05-029.03 ppb910 to 34.9 ppb
2007-05-011.44 ppb530 to 4.7 ppb
2007-04-240.38 ppb430 to 1.5 ppb
2007-04-170.48 ppb540 to 2.4 ppb
2007-04-111 ppb210 to 2 ppb
2007-04-100.45 ppb430 to 1.8 ppb
2007-04-060 ppb110 ppb
2007-04-051.7 ppb101.7 ppb
2007-04-031.28 ppb530 to 5 ppb
2007-03-270.3 ppb430 to 1.2 ppb
2007-03-200.35 ppb430 to 1.4 ppb
2007-03-140.3 ppb430 to 1.2 ppb
2007-03-1347.5 ppb+2046 to 49 ppb
2007-03-091.4 ppb101.4 ppb
2007-03-072.73 ppb310 to 6.2 ppb
2007-03-060.94 ppb530 to 3.4 ppb
2007-02-270.28 ppb430 to 1.1 ppb
2007-02-210 ppb330 ppb
2007-02-140 ppb330 ppb
2007-02-080 ppb110 ppb
2007-02-0721 ppb302.2 to 37 ppb
2007-02-061.35 ppb430 to 5.4 ppb
2007-01-300.99 ppb100.99 ppb
2007-01-260 ppb220 ppb
2007-01-245.1 ppb201.2 to 9 ppb
2007-01-230.71 ppb100.71 ppb
2007-01-220 ppb220 ppb
2007-01-180.67 ppb960 to 3 ppb
2007-01-170 ppb330 ppb
2007-01-110 ppb110 ppb
2007-01-101.06 ppb760 to 7.4 ppb
2007-01-0913.8 ppb530 to 38 ppb
2007-01-031.27 ppb930 to 4.7 ppb
2006-12-280 ppb330 ppb
2006-12-210 ppb220 ppb
2006-12-192.23 ppb200.56 to 3.9 ppb
2006-12-120.5 ppb320 to 1.5 ppb
2006-12-0617.92 ppb520 to 46.8 ppb
2006-12-050 ppb110 ppb
2006-11-270 ppb330 ppb
2006-11-210 ppb220 ppb
2006-11-200 ppb110 ppb
2006-11-150 ppb110 ppb
2006-11-140 ppb220 ppb
2006-11-080 ppb220 ppb
2006-11-072.55 ppb210 to 5.1 ppb
2006-11-0148 ppb+2041.2 to 54.8 ppb
2006-10-310 ppb330 ppb
2006-10-250 ppb110 ppb
2006-10-240 ppb330 ppb
2006-10-182.3 ppb320 to 6.9 ppb
2006-10-170 ppb220 ppb
2006-10-110 ppb220 ppb
2006-10-100 ppb220 ppb
2006-10-0441.05 ppb+2036.2 to 45.9 ppb
2006-10-031.2 ppb430 to 4.8 ppb
2006-09-260 ppb330 ppb
2006-09-200 ppb110 ppb
2006-09-190 ppb220 ppb
2006-09-130 ppb110 ppb
2006-09-1222 ppb+420 to 48 ppb
2006-08-290 ppb330 ppb
2006-08-230 ppb110 ppb
2006-08-220 ppb220 ppb
2006-08-160 ppb110 ppb
2006-08-150 ppb220 ppb
2006-08-090 ppb110 ppb
2006-08-080.69 ppb420 to 2.1 ppb
2006-08-021.1 ppb430 to 4.4 ppb
2006-08-0141 ppb+2035 to 47 ppb
2006-07-260 ppb220 ppb
2006-07-250 ppb110 ppb
2006-07-200 ppb110 ppb
2006-07-193.8 ppb320 to 11.4 ppb
2006-07-180 ppb660 ppb
2006-07-120 ppb550 ppb
2006-07-117.92 ppb1180 to 46 ppb
2006-07-050.8 ppb940 to 4.7 ppb
2006-06-270 ppb330 ppb
2006-06-210 ppb330 ppb
2006-06-140 ppb330 ppb
2006-06-071.43 ppb430 to 5.7 ppb
2006-06-0643 ppb+2042 to 44 ppb
2006-05-300 ppb330 ppb
2006-05-240 ppb330 ppb
2006-05-170 ppb330 ppb
2006-05-110 ppb110 ppb
2006-05-100 ppb220 ppb
2006-05-093.4 ppb103.4 ppb
2006-05-050.63 ppb100.63 ppb
2006-05-020 ppb220 ppb
2006-04-250 ppb220 ppb
2006-04-240 ppb110 ppb
2006-04-190.2 ppb320 to 0.6 ppb
2006-04-180 ppb110 ppb
2006-04-120.17 ppb320 to 0.5 ppb
2006-04-1128 ppb+2023 to 33 ppb
2006-04-040.92 ppb650 to 5.5 ppb
2006-03-280 ppb220 ppb
2006-03-220 ppb330 ppb
2006-03-160 ppb110 ppb
2006-03-150 ppb330 ppb
2006-03-1436 ppb+2032 to 40 ppb
2006-03-090 ppb110 ppb
2006-03-081.87 ppb320 to 5.6 ppb
2006-03-020 ppb110 ppb
2006-03-010 ppb220 ppb
2006-02-222.03 ppb430 to 8.1 ppb
2006-02-1515.83 ppb320 to 47.5 ppb
2006-02-079.14 ppb530 to 40.5 ppb
2006-02-010.46 ppb530 to 1.7 ppb
2006-01-310 ppb110 ppb
2006-01-250 ppb220 ppb
2006-01-2421 ppb210 to 42 ppb
2006-01-190 ppb550 ppb
2006-01-118.24 ppb540 to 41.2 ppb
2006-01-100 ppb770 ppb
2006-01-050.61 ppb960 to 4 ppb
2006-01-040.84 ppb500.63 to 1.1 ppb
2005-12-280 ppb220 ppb
2005-12-210 ppb220 ppb
2005-12-1540 ppb+2037 to 43 ppb
2005-12-140 ppb220 ppb
2005-12-080 ppb110 ppb
2005-12-060 ppb110 ppb
2005-11-290 ppb220 ppb
2005-11-220 ppb220 ppb
2005-11-1515.86 ppb400.5 to 32 ppb
2005-11-080 ppb110 ppb
2005-11-010 ppb220 ppb
2005-10-250 ppb220 ppb
2005-10-1940.5 ppb+2039 to 42 ppb
2005-10-180 ppb220 ppb
2005-10-110 ppb220 ppb
2005-10-041.15 ppb430 to 4.6 ppb
2005-09-282.6 ppb210 to 5.2 ppb
2005-09-270 ppb220 ppb
2005-09-2117.75 ppb420 to 38 ppb
2005-09-202.2 ppb210 to 4.4 ppb
2005-09-130 ppb220 ppb
2005-09-080 ppb220 ppb
2005-09-073.1 ppb210 to 6.2 ppb
2005-08-301.6 ppb430 to 6.4 ppb
2005-08-250 ppb110 ppb
2005-08-180 ppb110 ppb
2005-08-160 ppb110 ppb
2005-08-122.8 ppb210 to 5.6 ppb
2005-08-107.2 ppb107.2 ppb
2005-08-090 ppb220 ppb
2005-08-032.45 ppb210 to 4.9 ppb
2005-08-021.9 ppb320 to 5.7 ppb
2005-07-260.88 ppb540 to 4.4 ppb
2005-07-2038 ppb+2037 to 39 ppb
2005-07-190.9 ppb430 to 3.6 ppb
2005-07-130.19 ppb320 to 0.58 ppb
2005-07-120 ppb220 ppb
2005-07-070 ppb220 ppb
2005-06-290 ppb220 ppb
2005-06-280 ppb220 ppb
2005-06-2240 ppb+2035 to 45 ppb
2005-06-210.27 ppb320 to 0.82 ppb
2005-06-150 ppb220 ppb
2005-06-080 ppb550 ppb
2005-06-070 ppb110 ppb
2005-06-020 ppb550 ppb
2005-05-2416 ppb420 to 35 ppb
2005-05-190 ppb330 ppb
2005-05-170 ppb220 ppb
2005-05-100 ppb440 ppb
2005-05-050 ppb110 ppb
2005-05-040 ppb330 ppb
2005-05-032.1 ppb310 to 5 ppb
2005-04-280 ppb110 ppb
2005-04-250.42 ppb210 to 0.83 ppb
2005-04-190 ppb330 ppb
2005-04-130 ppb110 ppb
2005-04-126.33 ppb320 to 19 ppb
2005-04-050 ppb110 ppb
2005-03-280 ppb110 ppb
2005-03-230 ppb110 ppb
2005-03-160 ppb110 ppb
2005-03-020 ppb550 ppb
2005-03-010.54 ppb100.54 ppb
2005-02-240 ppb110 ppb
2005-02-090 ppb220 ppb
2005-02-0315.33 ppb310 to 28 ppb
2005-02-020 ppb110 ppb
2005-01-260 ppb110 ppb
2005-01-250 ppb110 ppb
2005-01-200.53 ppb100.53 ppb
2005-01-120.52 ppb100.52 ppb
2005-01-056.3 ppb720 to 26 ppb
2004-12-280 ppb110 ppb
2004-12-200 ppb110 ppb
2004-12-150 ppb330 ppb
2004-12-080.58 ppb100.58 ppb
2004-12-010.37 ppb530 to 1.3 ppb
2004-11-220 ppb110 ppb
2004-11-170 ppb440 ppb
2004-11-100 ppb770 ppb
2004-11-030 ppb110 ppb
2004-10-270 ppb110 ppb
2004-10-2528 ppb+1028 ppb
2004-10-220 ppb110 ppb
2004-10-2023 ppb+1023 ppb
2004-10-060 ppb110 ppb
2004-09-290 ppb110 ppb
2004-09-220 ppb110 ppb
2004-09-150 ppb110 ppb
2004-09-080 ppb110 ppb
2004-09-010.92 ppb100.92 ppb
2004-08-250 ppb110 ppb
2004-08-180 ppb110 ppb
2004-08-110 ppb110 ppb
2004-08-040 ppb110 ppb
2004-07-280 ppb110 ppb
2004-07-210.34 ppb210 to 0.67 ppb
2004-07-140 ppb110 ppb
2004-07-071.53 ppb320 to 4.6 ppb
2004-06-301.6 ppb320 to 4.8 ppb
2004-06-230 ppb110 ppb
2004-06-160 ppb110 ppb
2004-06-150 ppb110 ppb
2004-06-090 ppb110 ppb
2004-06-020 ppb110 ppb
2004-05-300 ppb110 ppb
2004-05-260.53 ppb100.53 ppb
2004-05-190 ppb110 ppb
2004-05-1318 ppb1018 ppb
2004-05-120 ppb220 ppb
2004-05-050 ppb110 ppb
2004-04-280 ppb110 ppb
2004-04-210 ppb220 ppb
2004-04-140 ppb220 ppb
2004-04-070 ppb220 ppb
2004-04-020 ppb110 ppb
2004-03-310 ppb220 ppb
2004-03-240 ppb110 ppb
2004-03-170 ppb110 ppb
2004-03-100 ppb110 ppb
2004-03-030.52 ppb650 to 3.1 ppb
2004-02-250 ppb110 ppb
2004-02-182.23 ppb320 to 6.7 ppb
2004-02-110 ppb110 ppb
2004-02-040 ppb110 ppb
2004-01-271.67 ppb320 to 5 ppb
2004-01-200.27 ppb210 to 0.53 ppb
2004-01-130 ppb110 ppb
2004-01-060 ppb110 ppb