The Power of Information

National Drinking Water Database


Monterey Park-City, Water Dept. Utilities - Los Angeles, CA


Serves 57,000 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
3 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
716 days
Tests ConductedNumber of individual tests done for this contaminant
6,728 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.1.33 ppb
7 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
2009-03-240 ppb18180 ppb
2009-03-170 ppb18180 ppb
2009-03-100 ppb18180 ppb
2009-03-040 ppb660 ppb
2009-03-030 ppb24240 ppb
2009-02-230 ppb21210 ppb
2009-02-200 ppb880 ppb
2009-02-190 ppb10100 ppb
2009-02-180 ppb110 ppb
2009-02-110 ppb10100 ppb
2009-02-100 ppb880 ppb
2009-02-040 ppb550 ppb
2009-02-030 ppb25250 ppb
2009-01-270 ppb18180 ppb
2009-01-200 ppb18180 ppb
2009-01-160 ppb880 ppb
2009-01-130 ppb10100 ppb
2009-01-070 ppb18180 ppb
2009-01-060 ppb12120 ppb
2008-12-300 ppb18180 ppb
2008-12-230 ppb18180 ppb
2008-12-190 ppb880 ppb
2008-12-160 ppb10100 ppb
2008-12-120 ppb880 ppb
2008-12-090 ppb10100 ppb
2008-12-040 ppb550 ppb
2008-12-020 ppb25250 ppb
2008-11-240 ppb18180 ppb
2008-11-180 ppb21210 ppb
2008-11-100 ppb18180 ppb
2008-11-040 ppb30300 ppb
2008-10-280 ppb18180 ppb
2008-10-230 ppb18180 ppb
2008-10-140 ppb20200 ppb
2008-10-080 ppb18180 ppb
2008-10-070 ppb11110 ppb
2008-10-010 ppb18180 ppb
2008-09-230 ppb18180 ppb
2008-09-160 ppb18180 ppb
2008-09-090 ppb18180 ppb
2008-09-040 ppb110 ppb
2008-09-030 ppb30300 ppb
2008-08-270.16 ppb25240 to 4.1 ppb
2008-08-180 ppb19190 ppb
2008-08-150 ppb110 ppb
2008-08-140 ppb18180 ppb
2008-08-130 ppb220 ppb
2008-08-120 ppb16160 ppb
2008-08-070 ppb16160 ppb
2008-08-060 ppb880 ppb
2008-08-050 ppb33330 ppb
2008-08-010 ppb110 ppb
2008-07-300 ppb18180 ppb
2008-07-290 ppb220 ppb
2008-07-280 ppb16160 ppb
2008-07-230.48 ppb18170 to 8.7 ppb
2008-07-220.43 ppb18170 to 7.8 ppb
2008-07-160 ppb990 ppb
2008-07-150 ppb990 ppb
2008-07-090 ppb36360 ppb
2008-07-080 ppb20200 ppb
2008-07-020 ppb10100 ppb
2008-07-010 ppb880 ppb
2008-06-240.26 ppb18170 to 4.6 ppb
2008-06-170 ppb17170 ppb
2008-06-130 ppb880 ppb
2008-06-100 ppb10100 ppb
2008-06-030 ppb21210 ppb
2008-05-270 ppb990 ppb
2008-05-210 ppb10100 ppb
2008-05-200 ppb220 ppb
2008-05-150 ppb330 ppb
2008-05-140 ppb18180 ppb
2008-05-060 ppb29290 ppb
2008-04-280 ppb18180 ppb
2008-04-220 ppb18180 ppb
2008-04-160 ppb17170 ppb
2008-04-150 ppb990 ppb
2008-04-080 ppb990 ppb
2008-04-020 ppb12120 ppb
2008-03-250 ppb18180 ppb
2008-03-180 ppb990 ppb
2008-03-120 ppb990 ppb
2008-03-040 ppb31310 ppb
2008-02-260 ppb22220 ppb
2008-02-210 ppb18180 ppb
2008-02-120 ppb18180 ppb
2008-02-050 ppb29290 ppb
2008-01-300 ppb18180 ppb
2008-01-220 ppb10100 ppb
2008-01-180 ppb880 ppb
2008-01-160 ppb990 ppb
2008-01-070.15 ppb28270 to 4.3 ppb
2008-01-030 ppb18180 ppb
2007-12-270 ppb17170 ppb
2007-12-190 ppb10100 ppb
2007-12-110 ppb880 ppb
2007-12-060 ppb12120 ppb
2007-11-270 ppb18180 ppb
2007-11-210 ppb220 ppb
2007-11-200 ppb11110 ppb
2007-11-140 ppb18180 ppb
2007-11-060 ppb24240 ppb
2007-10-310 ppb110 ppb
2007-10-300 ppb880 ppb
2007-10-222.41 ppb920 to 3.3 ppb
2007-10-162.21 ppb920 to 3.2 ppb
2007-10-090.53 ppb1080 to 2.7 ppb
2007-10-030.64 ppb18140 to 3.1 ppb
2007-10-020 ppb440 ppb
2007-09-250.86 ppb17120 to 3.6 ppb
2007-09-200 ppb110 ppb
2007-09-180.82 ppb18130 to 3.3 ppb
2007-09-110.69 ppb17120 to 2.6 ppb
2007-09-050.9 ppb28190 to 3.5 ppb
2007-08-281.18 ppb18100 to 3.3 ppb
2007-08-210.82 ppb18130 to 3.3 ppb
2007-08-140.55 ppb18140 to 2.9 ppb
2007-08-130 ppb660 ppb
2007-08-070.47 ppb18150 to 3.2 ppb
2007-08-031.13 ppb850 to 3.2 ppb
2007-08-010.59 ppb22180 to 3.4 ppb
2007-07-261.41 ppb730 to 2.9 ppb
2007-07-250.81 ppb17120 to 3.1 ppb
2007-07-241.39 ppb730 to 2.6 ppb
2007-07-231.04 ppb740 to 2.5 ppb
2007-07-221.04 ppb740 to 2.5 ppb
2007-07-211.06 ppb740 to 2.6 ppb
2007-07-201.04 ppb740 to 2.6 ppb
2007-07-191.39 ppb730 to 2.6 ppb
2007-07-181.39 ppb730 to 2.7 ppb
2007-07-170.9 ppb17110 to 3.1 ppb
2007-07-161.46 ppb730 to 2.9 ppb
2007-07-151.4 ppb730 to 3 ppb
2007-07-141.06 ppb740 to 2.8 ppb
2007-07-130.69 ppb750 to 2.5 ppb
2007-07-120.7 ppb750 to 2.6 ppb
2007-07-111.03 ppb740 to 2.6 ppb
2007-07-100.42 ppb17140 to 2.6 ppb
2007-07-090.93 ppb740 to 2.3 ppb
2007-07-081.01 ppb740 to 2.5 ppb
2007-07-071.06 ppb740 to 2.7 ppb
2007-07-062.41 ppb740 to 6.8 ppb
2007-07-030.72 ppb17130 to 3.2 ppb
2007-07-020.24 ppb18160 to 2.3 ppb
2007-07-010.29 ppb870 to 2.3 ppb
2007-06-300.25 ppb870 to 2 ppb
2007-06-290.26 ppb870 to 2.1 ppb
2007-06-280 ppb880 ppb
2007-06-270.25 ppb870 to 2 ppb
2007-06-260.26 ppb980 to 2.3 ppb
2007-06-250 ppb18180 ppb
2007-06-240 ppb880 ppb
2007-06-230.28 ppb870 to 2.2 ppb
2007-06-220.3 ppb870 to 2.4 ppb
2007-06-200.67 ppb970 to 3.1 ppb
2007-06-120.68 ppb970 to 3.1 ppb
2007-06-050.59 ppb19150 to 2.8 ppb
2007-06-042.03 ppb1640 to 3 ppb
2007-06-032.44 ppb810 to 3.1 ppb
2007-06-022.16 ppb820 to 3.1 ppb
2007-06-011.89 ppb820 to 2.7 ppb
2007-05-311.64 ppb830 to 3 ppb
2007-05-301.63 ppb830 to 3.3 ppb
2007-05-291.42 ppb1790 to 3.3 ppb
2007-05-281.94 ppb820 to 3.5 ppb
2007-05-272.05 ppb820 to 3.6 ppb
2007-05-261.76 ppb830 to 3.7 ppb
2007-05-252.45 ppb810 to 3.1 ppb
2007-05-242 ppb820 to 2.9 ppb
2007-05-232.11 ppb820 to 3.3 ppb
2007-05-220.94 ppb18110 to 2.8 ppb
2007-05-211.45 ppb830 to 2.6 ppb
2007-05-201.45 ppb830 to 2.6 ppb
2007-05-191.19 ppb840 to 2.6 ppb
2007-05-181.51 ppb830 to 2.7 ppb
2007-05-172.03 ppb810 to 2.7 ppb
2007-05-162.14 ppb810 to 2.8 ppb
2007-05-151.02 ppb19120 to 3.3 ppb
2007-05-141.23 ppb1160 to 2.9 ppb
2007-05-131.89 ppb820 to 2.9 ppb
2007-05-121.55 ppb830 to 2.7 ppb
2007-05-111.24 ppb840 to 2.7 ppb
2007-05-101.59 ppb830 to 2.9 ppb
2007-05-091.15 ppb840 to 2.5 ppb
2007-05-081.1 ppb18110 to 3.4 ppb
2007-05-071.46 ppb940 to 3.1 ppb
2007-05-061.83 ppb720 to 3 ppb
2007-05-051.38 ppb840 to 3.1 ppb
2007-05-041.64 ppb830 to 3 ppb
2007-05-031.33 ppb840 to 2.8 ppb
2007-05-021.34 ppb840 to 3 ppb
2007-05-010.67 ppb27200 to 3 ppb
2007-04-300.51 ppb860 to 2.1 ppb
2007-04-290.56 ppb860 to 2.4 ppb
2007-04-280.25 ppb870 to 2 ppb
2007-04-270.6 ppb860 to 2.7 ppb
2007-04-250.63 ppb860 to 2.5 ppb
2007-04-240.56 ppb18140 to 2.9 ppb
2007-04-230.58 ppb860 to 2.5 ppb
2007-04-220.58 ppb860 to 2.5 ppb
2007-04-210.59 ppb860 to 2.6 ppb
2007-04-200.3 ppb870 to 2.4 ppb
2007-04-190.55 ppb860 to 2.4 ppb
2007-04-180.6 ppb860 to 2.6 ppb
2007-04-170.68 ppb17130 to 3.2 ppb
2007-04-160.83 ppb850 to 2.5 ppb
2007-04-150.64 ppb860 to 2.6 ppb
2007-04-140.65 ppb860 to 2.7 ppb
2007-04-130.98 ppb850 to 3.2 ppb
2007-04-123.78 ppb830 to 15 ppb
2007-04-100.43 ppb24200 to 2.9 ppb
2007-04-090.3 ppb870 to 2.4 ppb
2007-04-080.31 ppb870 to 2.5 ppb
2007-04-070.25 ppb870 to 2 ppb
2007-04-060.3 ppb870 to 2.4 ppb
2007-04-050.36 ppb870 to 2.9 ppb
2007-04-040.28 ppb870 to 2.2 ppb
2007-04-030.57 ppb27220 to 3.3 ppb
2007-04-020.34 ppb870 to 2.7 ppb
2007-04-010.34 ppb870 to 2.7 ppb
2007-03-310.34 ppb870 to 2.7 ppb
2007-03-300.46 ppb870 to 3.7 ppb
2007-03-290 ppb990 ppb
2007-03-280.28 ppb870 to 2.2 ppb
2007-03-270.38 ppb17150 to 3.3 ppb
2007-03-260 ppb110 ppb
2007-03-200.68 ppb1080 to 3.6 ppb
2007-03-130.69 ppb1080 to 3.5 ppb
2007-03-060.67 ppb19150 to 3.4 ppb
2007-03-010.59 ppb1080 to 3 ppb
2007-02-201.28 ppb950 to 3.5 ppb
2007-02-131.97 ppb1780 to 4.6 ppb
2007-02-092.41 ppb820 to 3.5 ppb
2007-02-071.22 ppb1160 to 3.1 ppb
2007-02-060.97 ppb26160 to 2.9 ppb
2007-02-051.45 ppb830 to 2.4 ppb
2007-02-041.45 ppb830 to 2.6 ppb
2007-02-031.76 ppb820 to 2.6 ppb
2007-02-022.4 ppb802.1 to 2.6 ppb
2007-02-011.93 ppb820 to 2.9 ppb
2007-01-312.11 ppb810 to 2.7 ppb
2007-01-301.71 ppb1780 to 3.6 ppb
2007-01-292.14 ppb820 to 3 ppb
2007-01-282.1 ppb820 to 2.9 ppb
2007-01-272.41 ppb810 to 3 ppb
2007-01-262.68 ppb1210 to 3.4 ppb
2007-01-252.64 ppb1210 to 3.4 ppb
2007-01-242.28 ppb1220 to 3.2 ppb
2007-01-231.18 ppb1790 to 3 ppb
2007-01-222.21 ppb1220 to 3.3 ppb
2007-01-212.42 ppb1220 to 3.5 ppb
2007-01-201.68 ppb1250 to 3.9 ppb
2007-01-192.61 ppb1220 to 4 ppb
2007-01-182.81 ppb1310 to 4 ppb
2007-01-170.36 ppb870 to 2.9 ppb
2007-01-161.66 ppb1880 to 4.1 ppb
2007-01-150.78 ppb850 to 2.1 ppb
2007-01-141.83 ppb820 to 2.9 ppb
2007-01-131.45 ppb830 to 2.9 ppb
2007-01-121.94 ppb820 to 3.2 ppb
2007-01-111.85 ppb820 to 2.8 ppb
2007-01-102.68 ppb810 to 3.3 ppb
2007-01-091.52 ppb24120 to 3.8 ppb
2007-01-083.34 ppb820 to 5.8 ppb
2007-01-031.29 ppb840 to 2.9 ppb
2006-12-261.31 ppb840 to 3.1 ppb
2006-12-190.88 ppb1070 to 3.3 ppb
2006-12-121.11 ppb850 to 3.5 ppb
2006-12-050.99 ppb19120 to 3.2 ppb
2006-12-041.43 ppb830 to 2.5 ppb
2006-12-030.98 ppb850 to 2.9 ppb
2006-12-021.01 ppb850 to 2.8 ppb
2006-12-011.08 ppb850 to 3 ppb
2006-11-300.76 ppb1070 to 2.8 ppb
2006-11-291.65 ppb1760 to 3.4 ppb
2006-11-280.99 ppb850 to 3 ppb
2006-11-270.95 ppb850 to 2.9 ppb
2006-11-260.95 ppb850 to 2.7 ppb
2006-11-251.03 ppb850 to 2.8 ppb
2006-11-240.93 ppb850 to 2.6 ppb
2006-11-231.25 ppb840 to 2.9 ppb
2006-11-220.91 ppb850 to 2.6 ppb
2006-11-211.02 ppb18110 to 3.2 ppb
2006-11-201.15 ppb840 to 2.5 ppb
2006-11-190.95 ppb850 to 2.8 ppb
2006-11-180.94 ppb850 to 2.6 ppb
2006-11-170.98 ppb850 to 2.6 ppb
2006-11-160.88 ppb850 to 2.5 ppb
2006-11-150.3 ppb870 to 2.4 ppb
2006-11-140.82 ppb26180 to 3.2 ppb
2006-11-130.8 ppb850 to 2.3 ppb
2006-11-120.58 ppb860 to 2.4 ppb
2006-11-110.86 ppb850 to 2.4 ppb
2006-11-100.9 ppb17110 to 3.4 ppb
2006-11-090.3 ppb870 to 2.4 ppb
2006-11-080.29 ppb870 to 2.3 ppb
2006-11-070.35 ppb13110 to 2.4 ppb
2006-11-060.25 ppb870 to 2 ppb
2006-11-050.26 ppb870 to 2.1 ppb
2006-11-040.28 ppb870 to 2.2 ppb
2006-11-031.18 ppb850 to 3.2 ppb
2006-11-010.59 ppb860 to 2.4 ppb
2006-10-311.37 ppb19100 to 4.2 ppb
2006-10-301.15 ppb850 to 3.6 ppb
2006-10-270 ppb220 ppb
2006-10-250 ppb220 ppb
2006-10-241.4 ppb20110 to 3.7 ppb
2006-10-230.94 ppb1070 to 4.3 ppb
2006-10-200 ppb220 ppb
2006-10-180 ppb220 ppb
2006-10-172.24 ppb1030 to 4.4 ppb
2006-10-160 ppb220 ppb
2006-10-130 ppb330 ppb
2006-10-102 ppb1040 to 4.1 ppb
2006-10-060 ppb880 ppb
2006-10-040 ppb880 ppb
2006-10-031.29 ppb21120 to 4.1 ppb
2006-10-022.94 ppb710 to 3.9 ppb
2006-10-012.96 ppb710 to 3.6 ppb
2006-09-303.17 ppb710 to 4.1 ppb
2006-09-293.27 ppb710 to 4 ppb
2006-09-282.73 ppb710 to 3.4 ppb
2006-09-272.63 ppb710 to 3.3 ppb
2006-09-262.5 ppb2160 to 4.3 ppb
2006-09-253.09 ppb710 to 3.8 ppb
2006-09-242.91 ppb710 to 3.8 ppb
2006-09-233.09 ppb710 to 3.8 ppb
2006-09-223.63 ppb710 to 4.9 ppb
2006-09-213.27 ppb710 to 4.2 ppb
2006-09-203.41 ppb710 to 4.2 ppb
2006-09-192.04 ppb26110 to 5.3 ppb
2006-09-183.43 ppb710 to 5.8 ppb
2006-09-153.01 ppb710 to 3.8 ppb
2006-09-143.06 ppb710 to 3.9 ppb
2006-09-133.09 ppb710 to 3.8 ppb
2006-09-122.94 ppb810 to 4 ppb
2006-09-112.47 ppb710 to 3.3 ppb
2006-09-102.37 ppb710 to 3.4 ppb
2006-09-092.43 ppb710 to 3.1 ppb
2006-09-082.11 ppb710 to 3 ppb
2006-09-072.29 ppb710 to 3.1 ppb
2006-09-062.57 ppb710 to 3.6 ppb
2006-09-051.37 ppb1150 to 2.9 ppb
2006-09-043.01 ppb710 to 3.9 ppb
2006-09-033.26 ppb702 to 3.7 ppb
2006-09-023.03 ppb710 to 4 ppb
2006-09-012.21 ppb720 to 3.8 ppb
2006-08-312.16 ppb710 to 2.9 ppb
2006-08-301.23 ppb1170 to 3.8 ppb
2006-08-292.43 ppb810 to 3.8 ppb
2006-08-282.26 ppb710 to 3 ppb
2006-08-272.09 ppb710 to 2.9 ppb
2006-08-261.8 ppb720 to 2.9 ppb
2006-08-251.37 ppb730 to 2.8 ppb
2006-08-241.53 ppb730 to 3 ppb
2006-08-232.44 ppb710 to 3.7 ppb
2006-08-221.8 ppb820 to 3 ppb
2006-08-212.2 ppb610 to 3.2 ppb
2006-08-202.51 ppb710 to 3.6 ppb
2006-08-192.53 ppb702 to 3.4 ppb
2006-08-181.4 ppb730 to 2.7 ppb
2006-08-171.89 ppb720 to 3.1 ppb
2006-08-161.91 ppb720 to 3 ppb
2006-08-151.84 ppb820 to 2.8 ppb
2006-08-141.09 ppb740 to 2.7 ppb
2006-08-131.07 ppb740 to 2.6 ppb
2006-08-121.14 ppb740 to 2.9 ppb
2006-08-111.07 ppb740 to 2.6 ppb
2006-08-101.03 ppb740 to 2.7 ppb
2006-08-091.06 ppb740 to 2.6 ppb
2006-08-080.91 ppb850 to 3 ppb
2006-08-071.36 ppb730 to 2.8 ppb
2006-08-060.99 ppb740 to 2.4 ppb
2006-08-051.06 ppb740 to 2.6 ppb
2006-08-041.31 ppb740 to 3.2 ppb
2006-08-031.3 ppb740 to 3.5 ppb
2006-08-021.59 ppb740 to 4.8 ppb
2006-08-010 ppb440 ppb
2006-07-250 ppb110 ppb
2006-07-242.4 ppb710 to 3 ppb
2006-07-232.47 ppb710 to 3.1 ppb
2006-07-222.44 ppb710 to 3 ppb
2006-07-212.53 ppb710 to 3.2 ppb
2006-07-202.5 ppb710 to 3.2 ppb
2006-07-192.51 ppb710 to 3.2 ppb
2006-07-182.5 ppb810 to 3.1 ppb
2006-07-172.59 ppb710 to 3.1 ppb
2006-07-162.5 ppb710 to 3.1 ppb
2006-07-152.56 ppb710 to 3.1 ppb
2006-07-142.61 ppb710 to 3.2 ppb
2006-07-132.69 ppb710 to 3.2 ppb
2006-07-122.7 ppb710 to 3.2 ppb
2006-07-112.54 ppb810 to 3.3 ppb
2006-07-102.59 ppb710 to 3.4 ppb
2006-07-092.63 ppb710 to 3.4 ppb
2006-07-082.61 ppb710 to 3.5 ppb
2006-07-072.79 ppb710 to 3.7 ppb
2006-07-062.51 ppb710 to 3.2 ppb
2006-07-052.2 ppb710 to 2.9 ppb
2006-07-042.26 ppb710 to 2.8 ppb
2006-07-031.42 ppb1150 to 2.8 ppb
2006-07-022.79 ppb710 to 3.8 ppb
2006-07-012.51 ppb710 to 3.3 ppb
2006-06-302.53 ppb710 to 3.2 ppb
2006-06-292.6 ppb710 to 3.2 ppb
2006-06-282.57 ppb710 to 3.2 ppb
2006-06-272.69 ppb710 to 3.8 ppb
2006-06-262.43 ppb920 to 4.5 ppb
2006-06-252.46 ppb710 to 3.4 ppb
2006-06-242.29 ppb710 to 3.1 ppb
2006-06-232.89 ppb710 to 3.7 ppb
2006-06-222.69 ppb710 to 3.4 ppb
2006-06-212.63 ppb710 to 3.1 ppb
2006-06-202.65 ppb810 to 4.1 ppb
2006-06-192.43 ppb720 to 3.6 ppb
2006-06-180 ppb770 ppb
2006-06-170.74 ppb750 to 2.6 ppb
2006-06-161.12 ppb23140 to 4.5 ppb
2006-06-152.39 ppb710 to 2.9 ppb
2006-06-142.3 ppb710 to 2.9 ppb
2006-06-132.09 ppb820 to 2.8 ppb
2006-06-122.26 ppb710 to 2.8 ppb
2006-06-112.26 ppb710 to 2.8 ppb
2006-06-102.53 ppb710 to 3.8 ppb
2006-06-092.57 ppb710 to 3.4 ppb
2006-06-082.39 ppb710 to 2.9 ppb
2006-06-072.37 ppb710 to 3 ppb
2006-06-061.47 ppb1150 to 2.8 ppb
2006-06-052.34 ppb710 to 2.9 ppb
2006-06-042.39 ppb710 to 3 ppb
2006-06-032.44 ppb710 to 3.1 ppb
2006-06-022.39 ppb710 to 3 ppb
2006-06-012.41 ppb710 to 2.9 ppb
2006-05-312.57 ppb710 to 3.4 ppb
2006-05-301.41 ppb1790 to 3.4 ppb
2006-05-292.7 ppb730 to 6.3 ppb
2006-05-251.96 ppb720 to 3 ppb
2006-05-240.93 ppb740 to 2.3 ppb
2006-05-230.39 ppb760 to 2.7 ppb
2006-05-220.74 ppb17130 to 3.8 ppb
2006-05-201.53 ppb730 to 3.4 ppb
2006-05-191.87 ppb720 to 3.3 ppb
2006-05-181.87 ppb720 to 3 ppb
2006-05-171.26 ppb730 to 2.4 ppb
2006-05-160.55 ppb16130 to 3.1 ppb
2006-05-151.64 ppb730 to 3.6 ppb
2006-05-141.16 ppb740 to 2.8 ppb
2006-05-131.37 ppb740 to 3.6 ppb
2006-05-121.71 ppb730 to 3.6 ppb
2006-05-110.56 ppb17140 to 3.6 ppb
2006-05-101.53 ppb740 to 3.8 ppb
2006-05-091.11 ppb850 to 3 ppb
2006-05-081.67 ppb740 to 4.5 ppb
2006-05-071.29 ppb740 to 3.2 ppb
2006-05-061.96 ppb740 to 5.5 ppb
2006-05-020.82 ppb27200 to 3.8 ppb
2006-05-011.49 ppb740 to 3.6 ppb
2006-04-271.1 ppb740 to 2.8 ppb
2006-04-261.11 ppb740 to 2.7 ppb
2006-04-250.97 ppb18120 to 3.6 ppb
2006-04-241.73 ppb740 to 4.6 ppb
2006-04-180.85 ppb20140 to 3.1 ppb
2006-04-171.54 ppb740 to 3.7 ppb
2006-04-141.2 ppb740 to 3 ppb
2006-04-131.49 ppb740 to 3.7 ppb
2006-04-110.99 ppb16100 to 3.2 ppb
2006-04-101.74 ppb740 to 4.2 ppb
2006-04-071.09 ppb850 to 3.2 ppb
2006-04-061.43 ppb740 to 3.5 ppb
2006-04-051.27 ppb740 to 3.1 ppb
2006-04-040.88 ppb22160 to 4.1 ppb
2006-04-032.13 ppb730 to 5 ppb
2006-03-311.05 ppb210 to 2.1 ppb
2006-03-290.55 ppb1080 to 2.8 ppb
2006-03-270.7 ppb430 to 2.8 ppb
2006-03-220.92 ppb960 to 3.2 ppb
2006-03-212.61 ppb710 to 3.1 ppb
2006-03-202.6 ppb710 to 3.2 ppb
2006-03-192.77 ppb710 to 3.4 ppb
2006-03-182.79 ppb710 to 3.4 ppb
2006-03-172.8 ppb710 to 3.5 ppb
2006-03-162.79 ppb710 to 3.4 ppb
2006-03-153.3 ppb710 to 4 ppb
2006-03-141.55 ppb1790 to 3.9 ppb
2006-03-133 ppb710 to 3.7 ppb
2006-03-122.84 ppb710 to 3.4 ppb
2006-03-113.23 ppb710 to 4.1 ppb
2006-03-093.23 ppb710 to 4.1 ppb
2006-03-083.71 ppb710 to 4.7 ppb
2006-03-070.52 ppb20170 to 4.5 ppb
2006-02-271.78 ppb1780 to 3.8 ppb
2006-02-262.87 ppb710 to 3.6 ppb
2006-02-253.43 ppb710 to 4.2 ppb
2006-02-232.82 ppb1030 to 4.3 ppb
2006-02-212 ppb1780 to 4.7 ppb
2006-02-173.6 ppb710 to 4.6 ppb
2006-02-141.84 ppb1780 to 4.7 ppb
2006-02-134 ppb710 to 5.1 ppb
2006-02-092.67 ppb710 to 3.4 ppb
2006-02-080.91 ppb740 to 2.2 ppb
2006-02-071.2 ppb27180 to 5.1 ppb
2006-02-063.16 ppb710 to 4.2 ppb
2006-02-020 ppb110 ppb
2006-01-310.63 ppb16130 to 4.3 ppb
2006-01-252.57 ppb710 to 3.5 ppb
2006-01-241.34 ppb17110 to 4.5 ppb
2006-01-212.37 ppb710 to 3 ppb
2006-01-202.33 ppb710 to 3.3 ppb
2006-01-192.96 ppb710 to 3.8 ppb
2006-01-183.04 ppb710 to 3.9 ppb
2006-01-171.45 ppb1790 to 3.5 ppb
2006-01-162.76 ppb710 to 3.5 ppb
2006-01-142.63 ppb710 to 3.3 ppb
2006-01-132.54 ppb710 to 3.1 ppb
2006-01-122.61 ppb710 to 3.2 ppb
2006-01-112.61 ppb710 to 3.3 ppb
2006-01-101.57 ppb1150 to 3 ppb
2006-01-092.63 ppb710 to 3.2 ppb
2006-01-082.66 ppb710 to 3.4 ppb
2006-01-072.8 ppb710 to 3.6 ppb
2006-01-063.16 ppb710 to 4.3 ppb
2006-01-054.24 ppb710 to 5.6 ppb
2006-01-040 ppb110 ppb
2006-01-033.87 ppb710 to 4.9 ppb
2005-12-313.04 ppb710 to 3.7 ppb
2005-12-302.61 ppb710 to 3.4 ppb
2005-12-293.16 ppb710 to 3.8 ppb
2005-12-282.12 ppb930 to 3.6 ppb
2005-12-273.19 ppb710 to 4 ppb
2005-12-262.71 ppb710 to 3.7 ppb
2005-12-252.69 ppb710 to 3.4 ppb
2005-12-242.76 ppb710 to 3.6 ppb
2005-12-233.14 ppb710 to 3.8 ppb
2005-12-223.35 ppb603.1 to 3.7 ppb
2005-12-213.48 ppb603.2 to 3.9 ppb
2005-12-202.45 ppb820 to 3.6 ppb
2005-12-193.32 ppb602.9 to 3.5 ppb
2005-12-183.33 ppb602.9 to 3.7 ppb
2005-12-173.33 ppb603.1 to 3.6 ppb
2005-12-163.15 ppb602.9 to 3.4 ppb
2005-12-153.23 ppb602.9 to 3.4 ppb
2005-12-143.15 ppb602.9 to 3.3 ppb
2005-12-132.41 ppb820 to 3.4 ppb
2005-12-123.43 ppb603.3 to 3.8 ppb
2005-12-113.38 ppb603.2 to 3.5 ppb
2005-12-103.32 ppb603.3 to 3.4 ppb
2005-12-093.38 ppb603.1 to 3.7 ppb
2005-12-082.8 ppb602.5 to 3.2 ppb
2005-12-073.25 ppb603 to 3.4 ppb
2005-12-061.46 ppb1150 to 2.9 ppb
2005-12-052.97 ppb602.7 to 3.1 ppb
2005-12-042.9 ppb602.7 to 3.3 ppb
2005-12-032.97 ppb602.5 to 3.7 ppb
2005-12-023.1 ppb602.9 to 3.5 ppb
2005-12-012.97 ppb602.8 to 3.1 ppb
2005-11-302.97 ppb602.8 to 3.1 ppb
2005-11-292.58 ppb820 to 4 ppb
2005-11-282.57 ppb710 to 3.2 ppb
2005-11-273 ppb602.9 to 3.2 ppb
2005-11-263 ppb602.9 to 3.2 ppb
2005-11-252.9 ppb602.7 to 3 ppb
2005-11-243.03 ppb602.8 to 3.2 ppb
2005-11-233.08 ppb602.9 to 3.2 ppb
2005-11-222.38 ppb820 to 3.3 ppb
2005-11-213.13 ppb602.8 to 3.4 ppb
2005-11-203.07 ppb602.8 to 3.3 ppb
2005-11-193.08 ppb602.8 to 3.4 ppb
2005-11-182.93 ppb602.5 to 3.3 ppb
2005-11-172.7 ppb602.3 to 3 ppb
2005-11-162.62 ppb502.2 to 3.1 ppb
2005-11-151.83 ppb930 to 3.4 ppb
2005-11-140.94 ppb530 to 2.5 ppb
2005-11-130.44 ppb540 to 2.2 ppb
2005-11-120.98 ppb530 to 2.5 ppb
2005-11-111.22 ppb530 to 3.3 ppb
2005-11-101.98 ppb530 to 5 ppb
2005-11-080.48 ppb1190 to 2.7 ppb
2005-11-071.57 ppb320 to 4.7 ppb
2005-11-041.66 ppb530 to 4.2 ppb
2005-11-022.58 ppb510 to 4.2 ppb
2005-11-011.05 ppb26180 to 4.8 ppb
2005-10-302.32 ppb510 to 3.6 ppb
2005-10-292.16 ppb510 to 3.3 ppb
2005-10-282.6 ppb502.2 to 3.1 ppb
2005-10-271.4 ppb1470 to 3.3 ppb
2005-10-262.68 ppb502.4 to 3.1 ppb
2005-10-252 ppb820 to 3.4 ppb
2005-10-242.94 ppb502.5 to 3.6 ppb
2005-10-191.46 ppb1780 to 3.2 ppb
2005-10-182.58 ppb502.4 to 2.8 ppb
2005-10-172.44 ppb502.1 to 2.7 ppb
2005-10-162.5 ppb502.2 to 2.9 ppb
2005-10-152.42 ppb502.3 to 2.7 ppb
2005-10-140 ppb550 ppb
2005-10-131.1 ppb530 to 2.8 ppb
2005-10-121.62 ppb520 to 2.9 ppb
2005-10-111.08 ppb530 to 2.8 ppb
2005-10-101.19 ppb17100 to 3.4 ppb
2005-10-091.16 ppb530 to 3 ppb
2005-10-081.16 ppb530 to 2.9 ppb
2005-10-070 ppb550 ppb
2005-10-060 ppb660 ppb
2005-10-051.02 ppb530 to 2.6 ppb
2005-10-040.59 ppb25200 to 3.6 ppb
2005-10-030 ppb550 ppb
2005-10-020 ppb550 ppb
2005-10-010 ppb550 ppb
2005-09-300 ppb550 ppb
2005-09-290 ppb550 ppb
2005-09-280 ppb550 ppb
2005-09-270.26 ppb17150 to 2.3 ppb
2005-09-260 ppb550 ppb
2005-09-250 ppb550 ppb
2005-09-240 ppb550 ppb
2005-09-230 ppb550 ppb
2005-09-220 ppb660 ppb
2005-09-210.12 ppb17160 to 2 ppb
2005-09-200 ppb660 ppb
2005-09-190 ppb550 ppb
2005-09-180 ppb550 ppb
2005-09-170 ppb440 ppb
2005-09-160 ppb550 ppb
2005-09-150 ppb550 ppb
2005-09-140 ppb550 ppb
2005-09-130.14 ppb17160 to 2.3 ppb
2005-09-120 ppb660 ppb
2005-09-110 ppb660 ppb
2005-09-100 ppb660 ppb
2005-09-090 ppb660 ppb
2005-09-080 ppb660 ppb
2005-09-070.42 ppb27230 to 3.8 ppb
2005-08-300.6 ppb1190 to 3.4 ppb
2005-08-230.5 ppb1190 to 3.1 ppb
2005-08-160.54 ppb17140 to 4.2 ppb
2005-08-151.28 ppb540 to 6.4 ppb
2005-08-090.53 ppb1190 to 3 ppb
2005-08-020.74 ppb21170 to 5.1 ppb
2005-07-260.66 ppb29230 to 4.7 ppb
2005-07-210.66 ppb14110 to 4.8 ppb
2005-07-191.03 ppb16120 to 5.5 ppb
2005-07-120.24 ppb29270 to 3.9 ppb
2005-07-072.05 ppb210 to 4.1 ppb
2005-07-050.7 ppb22180 to 5.9 ppb
2005-06-270.96 ppb17120 to 5 ppb
2005-06-201.27 ppb17110 to 6.5 ppb
2005-06-160 ppb220 ppb
2005-06-150.98 ppb21160 to 7.2 ppb
2005-06-070.99 ppb850 to 3.3 ppb
2005-05-310.51 ppb860 to 2.1 ppb
2005-05-240.84 ppb850 to 2.5 ppb
2005-05-171.1 ppb210 to 2.2 ppb
2005-05-127 ppb107 ppb
2005-05-111.13 ppb430 to 4.5 ppb
2005-05-062.56 ppb1410 to 4.4 ppb
2005-05-031.83 ppb310 to 2.9 ppb
2005-04-261.95 ppb201.1 to 2.8 ppb
2005-04-191.35 ppb630 to 3.1 ppb
2005-04-121.14 ppb530 to 3.1 ppb
2005-04-051.33 ppb630 to 2.7 ppb
2005-03-291.5 ppb210 to 3 ppb
2005-03-221 ppb210 to 2 ppb
2005-03-151.05 ppb210 to 2.1 ppb
2005-03-071.45 ppb210 to 2.9 ppb
2005-03-010.58 ppb430 to 2.3 ppb
2005-02-221.4 ppb210 to 2.8 ppb
2005-02-170 ppb110 ppb
2005-02-151.45 ppb210 to 2.9 ppb
2005-02-143.4 ppb210 to 6.8 ppb
2005-02-080 ppb220 ppb
2005-02-012.18 ppb510 to 3.1 ppb
2005-01-253.1 ppb103.1 ppb
2005-01-183 ppb103 ppb
2005-01-122.2 ppb102.2 ppb
2005-01-040.83 ppb320 to 2.5 ppb
2004-12-280 ppb110 ppb
2004-12-220.73 ppb15130 to 6.9 ppb
2004-12-210 ppb770 ppb
2004-12-201.32 ppb970 to 7.3 ppb
2004-12-130 ppb110 ppb
2004-12-070 ppb110 ppb
2004-12-060 ppb330 ppb
2004-11-220 ppb110 ppb
2004-11-154.3 ppb104.3 ppb
2004-11-103.13 ppb320 to 9.4 ppb
2004-11-084.1 ppb104.1 ppb
2004-11-021.03 ppb430 to 4.1 ppb
2004-10-250 ppb110 ppb
2004-10-180 ppb110 ppb
2004-10-110 ppb110 ppb
2004-10-040 ppb330 ppb
2004-09-270 ppb110 ppb
2004-09-200 ppb110 ppb
2004-09-150 ppb440 ppb
2004-09-080 ppb330 ppb
2004-08-300 ppb110 ppb
2004-08-230 ppb110 ppb
2004-08-020 ppb220 ppb
2004-07-260 ppb110 ppb
2004-06-236.05 ppb205.3 to 6.8 ppb
2004-05-123 ppb310 to 4.7 ppb
2004-04-260.63 ppb760 to 4.4 ppb
2004-04-190.68 ppb650 to 4.1 ppb
2004-04-120.69 ppb15130 to 5.9 ppb
2004-04-050.6 ppb870 to 4.8 ppb
2004-03-314 ppb104 ppb
2004-03-290.55 ppb870 to 4.4 ppb
2004-03-220.53 ppb870 to 4.2 ppb
2004-03-175.4 ppb105.4 ppb
2004-03-150.58 ppb870 to 4.6 ppb
2004-03-010.96 ppb15130 to 8.4 ppb
2004-02-240.58 ppb870 to 4.6 ppb
2004-02-170.61 ppb870 to 4.9 ppb
2004-02-090.78 ppb15130 to 7.4 ppb
2004-02-040.66 ppb870 to 5.3 ppb
2004-01-060 ppb110 ppb