Fluoride
Yorktown Water
Fluoride occurs naturally in surface and groundwater and is also added to drinking water by many water systems. Read More.
Fluoride has been promoted as a chemical that reduces dental cavities. Yet it is now well-established that fluoride primarily exerts its protective effects through topical mechanisms, such as sodium fluoride in toothpaste and mouthwash. In contrast, long-term ingestion of fluoride in water increases dental fluorosis, which includes mottling, pitting and weakening of the teeth. EPA's maximum legal limit is set at 4 parts per million (ppm) to prevent skeletal fluorosis, a condition where bones become brittle and more susceptible to fractures, although these effects may occur at lower doses.
Even fluoride levels of 0.7 ppm, the amount of fluoride in drinking water recommended by the U.S. Public Health Service, can result in too much fluoride for bottle-fed babies. EWG recommends that caregivers mix baby formula with fluoride-free water. The National Toxicology Program is investigating the potential for low doses of fluoride to alter thyroid function and childhood brain development.
445
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.927 ppm | 78 | 76 | ND - 1.41 ppm |
| 2015 | 0.827 ppm | 72 | 72 | 0.350 ppm - 1.81 ppm |
| 2016 | 0.972 ppm | 72 | 70 | ND - 1.56 ppm |
| 2017 | 0.817 ppm | 78 | 72 | ND - 1.09 ppm |
| 2018 | 0.763 ppm | 72 | 72 | 0.370 ppm - 1.33 ppm |
| 2019 | 0.887 ppm | 73 | 72 | ND - 1.34 ppm |
ppm = parts per million
State and national drinking water standards and health guidelines
EPA Maximum Contaminant
Level (MCL) 4 ppm
ppm = parts per million
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-01-29 | 140340009 | 0.990 ppm |
| 2014-01-29 | 140340012 | 0.950 ppm |
| 2014-01-29 | 140340010 | 0.850 ppm |
| 2014-01-29 | 140340008 | 1.28 ppm |
| 2014-01-29 | 140340011 | 1.26 ppm |
| 2014-01-29 | 140340007 | 0.980 ppm |
| 2014-02-20 | 140630012 | 1.41 ppm |
| 2014-02-20 | 140630011 | 1.41 ppm |
| 2014-02-20 | 140630015 | 1.36 ppm |
| 2014-02-20 | 140630010 | 1.09 ppm |
| 2014-02-20 | 140630013 | 1.20 ppm |
| 2014-02-20 | 140630014 | 1.31 ppm |
| 2014-03-24 | 140900027 | 1.05 ppm |
| 2014-03-24 | 140900038 | 1.15 ppm |
| 2014-03-24 | 140900029 | 1.08 ppm |
| 2014-03-24 | 140900036 | 1.19 ppm |
| 2014-03-24 | 140900028 | 1.16 ppm |
| 2014-03-24 | 140900037 | 1.24 ppm |
| 2014-04-24 | 141250006 | 1.02 ppm |
| 2014-04-24 | 141250011 | 0.980 ppm |
| 2014-04-24 | 141250009 | 0.990 ppm |
| 2014-04-24 | 141250008 | 0.900 ppm |
| 2014-04-24 | 141250007 | 1.03 ppm |
| 2014-04-24 | 141250010 | 0.980 ppm |
| 2014-05-27 | 141600021 | 0.680 ppm |
| 2014-05-27 | 141600020 | 0.690 ppm |
| 2014-05-27 | 141600025 | 0.780 ppm |
| 2014-05-27 | 141600024 | 0.760 ppm |
| 2014-05-27 | 141600023 | 0.890 ppm |
| 2014-05-27 | 141600019 | 0.750 ppm |
| 2014-06-24 | 141810032 | 1.000 ppm |
| 2014-06-24 | 141810031 | 0.830 ppm |
| 2014-06-24 | 141810030 | 0.940 ppm |
| 2014-06-24 | 141810022 | 0.720 ppm |
| 2014-06-24 | 141810023 | 0.880 ppm |
| 2014-06-24 | 141810021 | 0.840 ppm |
| 2014-07-29 | 142230038 | 0.780 ppm |
| 2014-07-29 | 142230036 | 0.950 ppm |
| 2014-07-29 | 142240006 | 0.920 ppm |
| 2014-07-29 | 142240004 | 0.800 ppm |
| 2014-07-29 | 142240005 | 0.890 ppm |
| 2014-07-29 | 142230037 | 0.900 ppm |
| 2014-08-11 | 142260004 | 0.300 ppm |
| 2014-08-11 | 142260009 | 1.12 ppm |
| 2014-08-11 | 142260007 | ND |
| 2014-08-11 | 142260005 | ND |
| 2014-08-11 | 142260006 | 0.860 ppm |
| 2014-08-11 | 142260008 | 0.240 ppm |
| 2014-08-28 | 142580006 | 0.880 ppm |
| 2014-08-28 | 142580012 | 0.920 ppm |
| 2014-08-28 | 142580010 | 0.760 ppm |
| 2014-08-28 | 142580011 | 0.910 ppm |
| 2014-08-28 | 142580007 | 0.820 ppm |
| 2014-08-28 | 142580008 | 0.810 ppm |
| 2014-09-25 | Y142860029 | 1.25 ppm |
| 2014-09-25 | Y142860024 | 0.870 ppm |
| 2014-09-25 | Y142860028 | 0.960 ppm |
| 2014-09-25 | Y142860035 | 1.09 ppm |
| 2014-09-25 | Y142860036 | 1.39 ppm |
| 2014-09-25 | Y142860023 | 0.890 ppm |
| 2014-10-22 | Y143070012 | 1.05 ppm |
| 2014-10-22 | Y143070015 | 1.04 ppm |
| 2014-10-22 | Y143070016 | 0.970 ppm |
| 2014-10-22 | Y143070014 | 0.870 ppm |
| 2014-10-22 | Y143070011 | 1.01 ppm |
| 2014-10-22 | Y143070013 | 1.23 ppm |
| 2014-11-26 | Y143490041 | 1.18 ppm |
| 2014-11-26 | Y143490015 | 0.720 ppm |
| 2014-11-26 | Y143490048 | 0.700 ppm |
| 2014-11-26 | Y143490017 | 0.820 ppm |
| 2014-11-26 | Y143490016 | 0.950 ppm |
| 2014-11-26 | Y143490031 | 0.630 ppm |
| 2014-12-22 | Y150130056 | 1.000 ppm |
| 2014-12-22 | Y150130047 | 0.950 ppm |
| 2014-12-22 | Y150130058 | 0.750 ppm |
| 2014-12-22 | Y150130055 | 0.760 ppm |
| 2014-12-22 | Y150130046 | 0.790 ppm |
| 2014-12-22 | Y150130048 | 0.930 ppm |
| 2015-01-26 | Y150500041 | 0.780 ppm |
| 2015-01-26 | Y150500040 | 0.930 ppm |
| 2015-01-26 | Y150500038 | 0.940 ppm |
| 2015-01-26 | Y150500037 | 0.870 ppm |
| 2015-01-26 | Y150500039 | 0.840 ppm |
| 2015-01-26 | Y150500036 | 1.07 ppm |
| 2015-02-24 | Y150690027 | 0.930 ppm |
| 2015-02-24 | Y150690018 | 0.640 ppm |
| 2015-02-24 | Y150690025 | 0.700 ppm |
| 2015-02-24 | Y150690019 | 0.830 ppm |
| 2015-02-24 | Y150690017 | 0.540 ppm |
| 2015-02-24 | Y150690026 | 0.910 ppm |
| 2015-03-23 | Y150890023 | 0.650 ppm |
| 2015-03-23 | Y150890022 | 0.730 ppm |
| 2015-03-23 | Y150890020 | 0.840 ppm |
| 2015-03-23 | Y150890024 | 0.640 ppm |
| 2015-03-23 | Y150890021 | 0.780 ppm |
| 2015-03-23 | Y150890019 | 0.840 ppm |
| 2015-04-29 | Y151340048 | 0.560 ppm |
| 2015-04-29 | Y151340038 | 0.600 ppm |
| 2015-04-29 | Y151340047 | 0.750 ppm |
| 2015-04-29 | Y151340037 | 0.620 ppm |
| 2015-04-29 | Y151340036 | 0.350 ppm |
| 2015-04-29 | Y151340046 | 0.570 ppm |
| 2015-05-28 | Y151740015 | 0.800 ppm |
| 2015-05-28 | Y151740012 | 0.810 ppm |
| 2015-05-28 | Y151740011 | 0.920 ppm |
| 2015-05-28 | Y151740016 | 0.840 ppm |
| 2015-05-28 | Y151740013 | 0.910 ppm |
| 2015-05-28 | Y151740014 | 0.890 ppm |
| 2015-06-29 | Y152150011 | 0.690 ppm |
| 2015-06-29 | Y152150009 | 0.670 ppm |
| 2015-06-29 | Y152150004 | 0.660 ppm |
| 2015-06-29 | Y152150005 | 0.680 ppm |
| 2015-06-29 | Y152150006 | 0.800 ppm |
| 2015-06-29 | Y152150010 | 0.820 ppm |
| 2015-07-28 | Y152510008 | 0.950 ppm |
| 2015-07-28 | Y152510004 | 0.860 ppm |
| 2015-07-28 | Y152510003 | 0.610 ppm |
| 2015-07-28 | Y152510006 | 0.860 ppm |
| 2015-07-28 | Y152510007 | 1.14 ppm |
| 2015-07-28 | Y152510002 | 0.750 ppm |
| 2015-08-28 | Y152580040 | 0.590 ppm |
| 2015-08-28 | Y152580039 | 0.610 ppm |
| 2015-08-28 | Y152580043 | 0.650 ppm |
| 2015-08-28 | Y152580042 | 0.740 ppm |
| 2015-08-28 | Y152580038 | 0.630 ppm |
| 2015-08-28 | Y152580041 | 0.770 ppm |
| 2015-09-30 | Y152890052 | 0.800 ppm |
| 2015-09-30 | Y152890046 | 0.770 ppm |
| 2015-09-30 | Y152890047 | 0.770 ppm |
| 2015-09-30 | Y152890054 | 0.800 ppm |
| 2015-09-30 | Y152890053 | 0.820 ppm |
| 2015-09-30 | Y152890048 | 0.910 ppm |
| 2015-10-30 | Y153270012 | 0.830 ppm |
| 2015-10-30 | Y153270011 | 0.840 ppm |
| 2015-10-30 | Y153270014 | 0.760 ppm |
| 2015-10-30 | Y153270013 | 0.910 ppm |
| 2015-10-30 | Y153270015 | 0.860 ppm |
| 2015-10-30 | Y153270016 | 0.830 ppm |
| 2015-11-27 | Y153570005 | 0.540 ppm |
| 2015-11-27 | Y153570006 | 0.530 ppm |
| 2015-11-27 | Y153570010 | 0.760 ppm |
| 2015-11-27 | Y153520043 | 0.830 ppm |
| 2015-11-27 | Y153520041 | 0.570 ppm |
| 2015-11-27 | Y153520042 | 0.810 ppm |
| 2015-12-30 | Y160270018 | 1.51 ppm |
| 2015-12-30 | Y160270017 | 1.24 ppm |
| 2015-12-30 | Y160270012 | 1.62 ppm |
| 2015-12-30 | Y160270019 | 1.17 ppm |
| 2015-12-30 | Y160270014 | 1.81 ppm |
| 2015-12-30 | Y160270013 | 1.70 ppm |
| 2016-01-29 | Y160470011 | 1.56 ppm |
| 2016-01-29 | Y160470012 | 1.55 ppm |
| 2016-01-29 | Y160470013 | 1.29 ppm |
| 2016-01-29 | Y160470017 | 1.54 ppm |
| 2016-01-29 | Y160470018 | 1.46 ppm |
| 2016-01-29 | Y160470019 | 1.48 ppm |
| 2016-02-29 | Y160740036 | 1.13 ppm |
| 2016-02-29 | Y160740024 | 1.54 ppm |
| 2016-02-29 | Y160740025 | 1.38 ppm |
| 2016-02-29 | Y160740026 | 1.43 ppm |
| 2016-02-29 | Y160740034 | 1.01 ppm |
| 2016-02-29 | Y160740035 | 1.54 ppm |
| 2016-03-31 | Y161040043 | 1.11 ppm |
| 2016-03-31 | Y161040044 | 1.27 ppm |
| 2016-03-31 | Y161040045 | 0.980 ppm |
| 2016-03-31 | Y161060024 | 1.17 ppm |
| 2016-03-31 | Y161060025 | 1.17 ppm |
| 2016-03-31 | Y161060027 | 1.21 ppm |
| 2016-04-29 | Y161440009 | ND |
| 2016-04-29 | Y161440010 | 1.01 ppm |
| 2016-04-29 | Y161440011 | 1.16 ppm |
| 2016-04-29 | Y161440012 | 1.13 ppm |
| 2016-04-29 | Y161440013 | 0.990 ppm |
| 2016-04-29 | Y161440014 | 0.960 ppm |
| 2016-05-31 | Y161650036 | 0.850 ppm |
| 2016-05-31 | Y161650037 | 0.880 ppm |
| 2016-05-31 | Y161650038 | 0.880 ppm |
| 2016-05-31 | Y161650044 | 1.06 ppm |
| 2016-05-31 | Y161650045 | 0.780 ppm |
| 2016-05-31 | Y161650046 | 0.740 ppm |
| 2016-06-30 | Y162000020 | 0.810 ppm |
| 2016-06-30 | Y162000021 | 1.000 ppm |
| 2016-06-30 | Y162000022 | 1.04 ppm |
| 2016-06-30 | Y162000023 | 0.980 ppm |
| 2016-06-30 | Y162000018 | 0.960 ppm |
| 2016-06-30 | Y162000019 | 0.790 ppm |
| 2016-07-31 | Y162350003 | 0.990 ppm |
| 2016-07-31 | Y162350004 | 0.880 ppm |
| 2016-07-31 | Y162350005 | 0.970 ppm |
| 2016-07-31 | Y162350006 | 0.720 ppm |
| 2016-07-31 | Y162350007 | 0.730 ppm |
| 2016-08-30 | Y162560015 | 1.09 ppm |
| 2016-08-30 | Y162560016 | 0.890 ppm |
| 2016-08-30 | Y162560019 | 0.860 ppm |
| 2016-08-30 | Y162560031 | 0.900 ppm |
| 2016-08-30 | Y162560032 | 0.890 ppm |
| 2016-08-30 | Y162560033 | 0.910 ppm |
| 2016-09-29 | Y162880035 | 0.770 ppm |
| 2016-09-29 | Y162880040 | 0.880 ppm |
| 2016-09-29 | Y162880046 | 0.940 ppm |
| 2016-09-29 | Y162880047 | 0.820 ppm |
| 2016-09-29 | Y162880059 | 0.800 ppm |
| 2016-09-29 | Y162880066 | 0.790 ppm |
| 2016-10-31 | Y163080007 | 0.920 ppm |
| 2016-10-31 | Y163080009 | 0.550 ppm |
| 2016-10-31 | Y163080013 | 1.04 ppm |
| 2016-10-31 | Y163080015 | 0.520 ppm |
| 2016-10-31 | Y163080018 | 0.590 ppm |
| 2016-10-31 | Y163080024 | 0.900 ppm |
| 2016-11-02 | Y163090002 | ND |
| 2016-11-30 | Y163420009 | 1.08 ppm |
| 2016-11-30 | Y163420010 | 0.880 ppm |
| 2016-11-30 | Y163420008 | 0.980 ppm |
| 2016-11-30 | Y163420017 | 0.740 ppm |
| 2016-11-30 | Y163420018 | 1.000 ppm |
| 2016-11-30 | Y163420019 | 0.860 ppm |
| 2016-12-30 | Y170050063 | 0.740 ppm |
| 2016-12-30 | Y170050064 | 1.000 ppm |
| 2016-12-30 | Y170050071 | 0.890 ppm |
| 2016-12-30 | Y170050059 | 0.780 ppm |
| 2016-12-30 | Y170050060 | 0.980 ppm |
| 2016-12-30 | Y170050062 | 0.860 ppm |
| 2017-01-31 | Y170350009 | 1.02 ppm |
| 2017-01-31 | Y170350010 | 1.01 ppm |
| 2017-01-31 | Y170350011 | 0.930 ppm |
| 2017-01-31 | Y170350001 | 0.940 ppm |
| 2017-01-31 | Y170350002 | 0.850 ppm |
| 2017-01-31 | Y170350003 | 0.860 ppm |
| 2017-02-27 | Y170650002 | 1.06 ppm |
| 2017-02-27 | Y170650003 | 0.900 ppm |
| 2017-02-27 | Y170650004 | 0.940 ppm |
| 2017-02-27 | Y170650005 | 1.02 ppm |
| 2017-02-27 | Y170650006 | 1.03 ppm |
| 2017-02-27 | Y170650007 | 1.03 ppm |
| 2017-03-31 | Y171070018 | 0.880 ppm |
| 2017-03-31 | Y171070019 | 0.990 ppm |
| 2017-03-31 | Y171070020 | 0.990 ppm |
| 2017-03-31 | Y171070021 | 0.980 ppm |
| 2017-03-31 | Y171070022 | 0.950 ppm |
| 2017-03-31 | Y171070023 | ND |
| 2017-04-26 | Y171350026 | 1.000 ppm |
| 2017-04-26 | Y171350027 | 1.04 ppm |
| 2017-04-26 | Y171350028 | 1.09 ppm |
| 2017-04-26 | Y171350029 | 0.710 ppm |
| 2017-04-26 | Y171350030 | 0.960 ppm |
| 2017-04-26 | Y171350031 | 0.780 ppm |
| 2017-05-30 | Y171560010 | 0.540 ppm |
| 2017-05-30 | Y171560011 | 0.780 ppm |
| 2017-05-30 | Y171560012 | 0.770 ppm |
| 2017-05-30 | Y171560013 | 0.600 ppm |
| 2017-05-30 | Y171560014 | 0.570 ppm |
| 2017-05-30 | Y171560015 | 1.000 ppm |
| 2017-06-28 | Y171840100 | 0.730 ppm |
| 2017-06-28 | Y171840101 | 1.03 ppm |
| 2017-06-28 | Y171840102 | 0.800 ppm |
| 2017-06-28 | Y171840103 | 0.870 ppm |
| 2017-06-28 | Y171840104 | 0.620 ppm |
| 2017-06-28 | Y171840105 | 0.950 ppm |
| 2017-07-28 | Y172190013 | 0.980 ppm |
| 2017-07-28 | Y172190014 | 0.740 ppm |
| 2017-07-28 | Y172190015 | 0.750 ppm |
| 2017-07-28 | Y172190016 | 0.670 ppm |
| 2017-07-28 | Y172190017 | 0.660 ppm |
| 2017-07-28 | Y172190018 | 0.660 ppm |
| 2017-08-07 | Y172220005 | 0.520 ppm |
| 2017-08-07 | Y172220006 | ND |
| 2017-08-07 | Y172220007 | ND |
| 2017-08-07 | Y172220008 | ND |
| 2017-08-07 | Y172220009 | ND |
| 2017-08-07 | Y172220010 | ND |
| 2017-08-31 | Y172540014 | 0.760 ppm |
| 2017-08-31 | Y172540015 | 0.800 ppm |
| 2017-08-31 | Y172540016 | 0.650 ppm |
| 2017-08-31 | Y172540017 | 0.700 ppm |
| 2017-08-31 | Y172540018 | 0.690 ppm |
| 2017-08-31 | Y172540019 | 0.680 ppm |
| 2017-09-28 | Y172820012 | 0.950 ppm |
| 2017-09-28 | Y172820013 | 0.940 ppm |
| 2017-09-28 | Y172820014 | 0.990 ppm |
| 2017-09-28 | Y172820016 | 0.980 ppm |
| 2017-09-28 | Y172820017 | 0.980 ppm |
| 2017-09-28 | Y172820018 | 1.000 ppm |
| 2017-10-30 | Y173100009 | 1.06 ppm |
| 2017-10-30 | Y173100010 | 0.830 ppm |
| 2017-10-30 | Y173100011 | 0.960 ppm |
| 2017-10-30 | Y173100016 | 0.970 ppm |
| 2017-10-30 | Y173100017 | 0.980 ppm |
| 2017-10-30 | Y173100018 | 0.970 ppm |
| 2017-11-29 | Y173450031 | 1.02 ppm |
| 2017-11-29 | Y173450032 | 0.950 ppm |
| 2017-11-29 | Y173450033 | 1.03 ppm |
| 2017-11-29 | Y173450034 | 1.08 ppm |
| 2017-11-29 | Y173450035 | 0.960 ppm |
| 2017-11-29 | Y173450036 | 0.900 ppm |
| 2017-12-29 | Y180080003 | 0.970 ppm |
| 2017-12-29 | Y180080004 | 0.800 ppm |
| 2017-12-29 | Y180080005 | 0.960 ppm |
| 2017-12-29 | Y180080006 | 1.05 ppm |
| 2017-12-29 | Y180080007 | 0.880 ppm |
| 2017-12-29 | Y180080008 | 1.02 ppm |
| 2018-01-31 | Y180360020 | 0.800 ppm |
| 2018-01-31 | Y180360017 | 0.680 ppm |
| 2018-01-31 | Y180360016 | 0.830 ppm |
| 2018-01-31 | Y180360021 | 0.730 ppm |
| 2018-01-31 | Y180360018 | 0.820 ppm |
| 2018-01-31 | Y180360019 | 0.760 ppm |
| 2018-02-28 | Y180660023 | 1.05 ppm |
| 2018-02-28 | Y180660021 | 1.03 ppm |
| 2018-02-28 | Y180660022 | 0.980 ppm |
| 2018-02-28 | Y180660024 | 0.940 ppm |
| 2018-02-28 | Y180660019 | 0.780 ppm |
| 2018-02-28 | Y180660020 | 0.760 ppm |
| 2018-03-30 | Y180990027 | 0.890 ppm |
| 2018-03-30 | Y180990026 | 0.970 ppm |
| 2018-03-30 | Y180990010 | 0.880 ppm |
| 2018-03-30 | Y180990028 | 0.970 ppm |
| 2018-03-30 | Y180990011 | 0.880 ppm |
| 2018-03-30 | Y180990009 | 1.33 ppm |
| 2018-04-30 | Y181300023 | 0.580 ppm |
| 2018-04-30 | Y181300024 | 0.580 ppm |
| 2018-04-30 | Y181300025 | 0.560 ppm |
| 2018-04-30 | Y181300028 | 0.570 ppm |
| 2018-04-30 | Y181300027 | 0.410 ppm |
| 2018-04-30 | Y181300026 | 0.540 ppm |
| 2018-05-31 | Y181620046 | 1.01 ppm |
| 2018-05-31 | Y181620043 | 1.02 ppm |
| 2018-05-31 | Y181620048 | 0.760 ppm |
| 2018-05-31 | Y181620045 | 1.01 ppm |
| 2018-05-31 | Y181620044 | 0.760 ppm |
| 2018-05-31 | Y181620047 | 0.750 ppm |
| 2018-06-29 | Y181900024 | 0.500 ppm |
| 2018-06-29 | Y181900020 | 0.550 ppm |
| 2018-06-29 | Y181900019 | 0.470 ppm |
| 2018-06-29 | Y181900025 | 0.550 ppm |
| 2018-06-29 | Y181900021 | 0.370 ppm |
| 2018-06-29 | Y181900023 | 0.580 ppm |
| 2018-07-31 | Y182250016 | 0.580 ppm |
| 2018-07-31 | Y182250019 | 0.460 ppm |
| 2018-07-31 | Y182250020 | 0.640 ppm |
| 2018-07-31 | Y182250017 | 0.450 ppm |
| 2018-07-31 | Y182250021 | 0.480 ppm |
| 2018-07-31 | Y182250015 | 0.660 ppm |
| 2018-08-30 | Y182530004 | 0.680 ppm |
| 2018-08-30 | Y182530003 | 0.660 ppm |
| 2018-08-30 | Y182530001 | 0.610 ppm |
| 2018-08-30 | Y182530005 | 0.670 ppm |
| 2018-08-30 | Y182530002 | 0.650 ppm |
| 2018-08-30 | Y182530006 | 0.670 ppm |
| 2018-09-28 | Y182810017 | 0.780 ppm |
| 2018-09-28 | Y182810012 | 0.860 ppm |
| 2018-09-28 | Y182810015 | 0.650 ppm |
| 2018-09-28 | Y182810013 | 0.810 ppm |
| 2018-09-28 | Y182810016 | 0.680 ppm |
| 2018-09-28 | Y182810014 | 0.610 ppm |
| 2018-10-30 | Y183170024 | 0.790 ppm |
| 2018-10-30 | Y183170012 | 0.660 ppm |
| 2018-10-30 | Y183170025 | 0.830 ppm |
| 2018-10-30 | Y183170013 | 0.890 ppm |
| 2018-10-30 | Y183170023 | 0.830 ppm |
| 2018-10-30 | Y183170011 | 0.820 ppm |
| 2018-11-30 | Y183440003 | 0.980 ppm |
| 2018-11-30 | Y183440005 | 1.04 ppm |
| 2018-11-30 | Y183440007 | 0.800 ppm |
| 2018-11-30 | Y183440004 | 1.05 ppm |
| 2018-11-30 | Y183440008 | 1.09 ppm |
| 2018-11-30 | Y183440006 | 0.840 ppm |
| 2018-12-31 | Y190140008 | 0.870 ppm |
| 2018-12-31 | Y190140012 | 0.850 ppm |
| 2018-12-31 | Y190140009 | 0.860 ppm |
| 2018-12-31 | Y190140010 | 0.730 ppm |
| 2018-12-31 | Y190140007 | 0.810 ppm |
| 2018-12-31 | Y190140011 | 0.930 ppm |
| 2019-01-30 | Y190420015 | 0.930 ppm |
| 2019-01-30 | Y190420011 | 0.860 ppm |
| 2019-01-30 | Y190420012 | 0.860 ppm |
| 2019-01-30 | Y190420014 | 1.04 ppm |
| 2019-01-30 | Y190420013 | 0.800 ppm |
| 2019-01-30 | Y190420016 | 0.840 ppm |
| 2019-02-28 | Y190700029 | 1.06 ppm |
| 2019-02-28 | Y190700031 | 0.770 ppm |
| 2019-02-28 | Y190700027 | 1.10 ppm |
| 2019-02-28 | Y190700026 | 0.670 ppm |
| 2019-02-28 | Y190700028 | 0.780 ppm |
| 2019-02-28 | Y190700030 | 1.34 ppm |
| 2019-03-29 | Y190980008 | 0.830 ppm |
| 2019-03-29 | Y190980012 | 0.900 ppm |
| 2019-03-29 | Y190980013 | 1.02 ppm |
| 2019-03-29 | Y190980014 | 0.850 ppm |
| 2019-03-29 | Y190980009 | 0.930 ppm |
| 2019-03-29 | Y190980010 | 1.03 ppm |
| 2019-04-29 | Y191260021 | 0.670 ppm |
| 2019-04-29 | Y191260017 | 0.740 ppm |
| 2019-04-29 | Y191260016 | 0.770 ppm |
| 2019-04-29 | Y191260020 | 0.570 ppm |
| 2019-04-29 | Y191260019 | 0.720 ppm |
| 2019-04-29 | Y191260018 | 0.690 ppm |
| 2019-05-30 | Y191610024 | 0.950 ppm |
| 2019-05-30 | Y191610020 | 0.900 ppm |
| 2019-05-30 | Y191610023 | 0.890 ppm |
| 2019-05-30 | Y191610022 | 0.940 ppm |
| 2019-05-30 | Y191610021 | 0.890 ppm |
| 2019-05-30 | Y191610019 | 0.940 ppm |
| 2019-06-28 | Y191960057 | 0.850 ppm |
| 2019-06-28 | Y191960007 | 0.920 ppm |
| 2019-06-28 | Y191960058 | 0.860 ppm |
| 2019-06-28 | Y191960056 | 0.900 ppm |
| 2019-06-28 | Y191960006 | 0.760 ppm |
| 2019-06-28 | Y191960005 | 0.870 ppm |
| 2019-07-30 | Y192250017 | 0.810 ppm |
| 2019-07-30 | Y192250015 | 0.720 ppm |
| 2019-07-30 | Y192250016 | 0.740 ppm |
| 2019-07-30 | Y192250020 | 0.710 ppm |
| 2019-07-30 | Y192250018 | 0.750 ppm |
| 2019-07-30 | Y192250019 | 0.850 ppm |
| 2019-08-30 | Y192540006 | 0.830 ppm |
| 2019-08-30 | Y192540003 | 1.01 ppm |
| 2019-08-30 | Y192540004 | 0.830 ppm |
| 2019-08-30 | Y192540002 | 0.780 ppm |
| 2019-08-30 | Y192540007 | 0.850 ppm |
| 2019-08-30 | Y192540005 | 0.850 ppm |
| 2019-09-30 | Y192820018 | 1.12 ppm |
| 2019-09-30 | Y192820020 | 0.880 ppm |
| 2019-09-30 | Y192820022 | 0.940 ppm |
| 2019-09-30 | Y192820021 | 0.860 ppm |
| 2019-09-30 | Y192820023 | 0.870 ppm |
| 2019-09-30 | Y192820019 | 0.940 ppm |
| 2019-10-15 | Y192900003 | ND |
| 2019-10-30 | Y193180026 | 1.03 ppm |
| 2019-10-30 | Y193180031 | 1.03 ppm |
| 2019-10-30 | Y193180024 | 0.960 ppm |
| 2019-10-30 | Y193180029 | 0.990 ppm |
| 2019-10-30 | Y193180030 | 0.980 ppm |
| 2019-10-30 | Y193180028 | 1.16 ppm |
| 2019-11-29 | Y193430028 | 0.840 ppm |
| 2019-11-29 | Y193430026 | 1.28 ppm |
| 2019-11-29 | Y193430023 | 1.04 ppm |
| 2019-11-29 | Y193430027 | 1.04 ppm |
| 2019-11-29 | Y193430024 | 0.930 ppm |
| 2019-11-29 | Y193430025 | 1.12 ppm |
| 2019-12-30 | Y200120016 | 0.880 ppm |
| 2019-12-30 | Y200120018 | 0.930 ppm |
| 2019-12-30 | Y200120013 | 1.02 ppm |
| 2019-12-30 | Y200120017 | 0.650 ppm |
| 2019-12-30 | Y200120014 | 1.03 ppm |
| 2019-12-30 | Y200120015 | 1.08 ppm |