Fluoride
Monticello Water Department
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.
413
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | 1.10 ppm | 60 | 57 | ND - 1.74 ppm |
| 2015 | 1.26 ppm | 71 | 67 | ND - 2.13 ppm |
| 2016 | 1.11 ppm | 76 | 72 | ND - 1.77 ppm |
| 2017 | 1.01 ppm | 71 | 67 | ND - 2.53 ppm |
| 2018 | 1.05 ppm | 69 | 69 | 0.340 ppm - 1.65 ppm |
| 2019 | 0.973 ppm | 66 | 63 | ND - 1.93 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 |
|---|---|---|
| 2014-01-28 | 140300064 | 1.44 ppm |
| 2014-01-28 | 140300065 | 1.74 ppm |
| 2014-01-28 | 140300063 | 1.03 ppm |
| 2014-01-28 | 140300066 | 1.57 ppm |
| 2014-02-05 | 140410019 | ND |
| 2014-02-20 | 140550039 | 1.14 ppm |
| 2014-02-20 | 140550040 | 0.620 ppm |
| 2014-02-20 | 140550042 | 1.18 ppm |
| 2014-02-20 | 140550041 | 1.41 ppm |
| 2014-02-20 | 140550037 | 0.880 ppm |
| 2014-03-27 | 140900033 | 1.31 ppm |
| 2014-03-27 | 140900032 | 0.900 ppm |
| 2014-03-27 | 140900031 | 1.61 ppm |
| 2014-03-27 | 140900034 | 0.770 ppm |
| 2014-04-22 | 141150001 | 0.840 ppm |
| 2014-04-29 | 141250021 | 1.56 ppm |
| 2014-04-29 | 141250018 | 1.70 ppm |
| 2014-04-29 | 141250019 | 1.10 ppm |
| 2014-04-29 | 141250023 | 0.810 ppm |
| 2014-04-29 | 141250020 | 0.420 ppm |
| 2014-04-29 | 141250022 | 1.55 ppm |
| 2014-05-28 | 141550005 | 0.790 ppm |
| 2014-05-28 | 141550003 | 1.52 ppm |
| 2014-05-28 | 141740001 | 1.31 ppm |
| 2014-05-28 | 141550002 | 0.890 ppm |
| 2014-05-28 | 141550006 | 1.43 ppm |
| 2014-05-28 | 141550004 | 0.740 ppm |
| 2014-06-25 | 141810027 | 1.35 ppm |
| 2014-06-25 | 141810025 | ND |
| 2014-06-25 | 141810024 | 1.56 ppm |
| 2014-06-25 | 141810026 | 0.910 ppm |
| 2014-07-14 | 142020024 | ND |
| 2014-07-29 | 142160004 | 0.910 ppm |
| 2014-07-29 | 142160001 | 1.24 ppm |
| 2014-07-29 | 142160002 | 1.65 ppm |
| 2014-07-29 | 142160003 | 0.780 ppm |
| 2014-08-26 | 142410004 | 1.65 ppm |
| 2014-08-26 | 142410007 | 1.36 ppm |
| 2014-08-26 | 142410005 | 0.660 ppm |
| 2014-08-26 | 142410006 | 1.18 ppm |
| 2014-09-29 | 142790017 | 1.08 ppm |
| 2014-09-29 | 142790015 | 1.12 ppm |
| 2014-09-29 | 142790019 | 1.52 ppm |
| 2014-09-29 | 142790018 | 1.27 ppm |
| 2014-09-29 | 142790016 | 1.000 ppm |
| 2014-09-30 | 142790002 | 0.520 ppm |
| 2014-10-29 | Y143070004 | 1.60 ppm |
| 2014-10-29 | Y143070007 | 0.410 ppm |
| 2014-10-29 | Y143070006 | 1.34 ppm |
| 2014-10-29 | Y143070005 | 1.16 ppm |
| 2014-10-29 | Y143070009 | 0.700 ppm |
| 2014-10-29 | Y143070008 | 1.42 ppm |
| 2014-11-03 | Y143110025 | 1.36 ppm |
| 2014-11-03 | Y143110024 | 1.04 ppm |
| 2014-11-25 | Y143420003 | 1.50 ppm |
| 2014-11-25 | Y143420004 | 0.620 ppm |
| 2014-11-25 | Y143420005 | 0.900 ppm |
| 2014-12-18 | Y143530008 | 1.30 ppm |
| 2014-12-18 | Y143530009 | 1.29 ppm |
| 2014-12-18 | Y143530007 | 1.47 ppm |
| 2015-01-28 | Y150330008 | 0.590 ppm |
| 2015-01-28 | Y150330007 | 1.22 ppm |
| 2015-01-28 | Y150330006 | 1.54 ppm |
| 2015-01-28 | Y150330019 | 1.26 ppm |
| 2015-02-12 | Y150500044 | 1.42 ppm |
| 2015-02-12 | Y150500043 | 1.67 ppm |
| 2015-02-12 | Y150500042 | 1.38 ppm |
| 2015-03-26 | Y150890029 | 1.08 ppm |
| 2015-03-26 | Y150890027 | 1.48 ppm |
| 2015-03-26 | Y150890026 | 1.21 ppm |
| 2015-03-26 | Y150890030 | 1.45 ppm |
| 2015-03-26 | Y150890025 | 1.63 ppm |
| 2015-03-26 | Y150890028 | 0.560 ppm |
| 2015-04-23 | Y151140033 | 1.36 ppm |
| 2015-04-23 | Y151140036 | 1.30 ppm |
| 2015-04-23 | Y151140037 | 1.36 ppm |
| 2015-04-23 | Y151140035 | 0.920 ppm |
| 2015-04-23 | Y151140034 | 1.35 ppm |
| 2015-04-23 | Y151140038 | 1.14 ppm |
| 2015-05-26 | Y151490001 | 1.40 ppm |
| 2015-05-27 | Y151490013 | ND |
| 2015-05-27 | Y151490021 | 1.69 ppm |
| 2015-05-27 | Y151490019 | 0.500 ppm |
| 2015-05-27 | Y151490014 | 1.46 ppm |
| 2015-05-27 | Y151490020 | 1.44 ppm |
| 2015-05-27 | Y151490022 | 1.31 ppm |
| 2015-06-17 | Y151740022 | 1.32 ppm |
| 2015-06-17 | Y151740021 | 1.22 ppm |
| 2015-06-17 | Y151740020 | 1.61 ppm |
| 2015-06-17 | Y151740023 | 1.09 ppm |
| 2015-07-30 | Y152150024 | 1.61 ppm |
| 2015-07-30 | Y152150021 | 1.24 ppm |
| 2015-07-30 | Y152150022 | 1.53 ppm |
| 2015-07-30 | Y152150026 | 1.28 ppm |
| 2015-07-30 | Y152150023 | 0.520 ppm |
| 2015-07-30 | Y152150025 | 1.22 ppm |
| 2015-08-03 | Y152180031 | 2.13 ppm |
| 2015-08-03 | Y152180030 | 0.740 ppm |
| 2015-08-03 | Y152180029 | 1.29 ppm |
| 2015-08-03 | Y152180028 | 1.63 ppm |
| 2015-08-13 | Y152360018 | 1.12 ppm |
| 2015-08-13 | Y152260064 | ND |
| 2015-08-13 | Y152260072 | ND |
| 2015-08-13 | Y152360017 | 1.07 ppm |
| 2015-08-13 | Y152260071 | 1.39 ppm |
| 2015-08-13 | Y152360016 | 1.17 ppm |
| 2015-09-29 | Y152780011 | 1.58 ppm |
| 2015-09-29 | Y152780014 | 1.78 ppm |
| 2015-09-29 | Y152780013 | 1.28 ppm |
| 2015-09-29 | Y152780009 | 0.980 ppm |
| 2015-09-29 | Y152780012 | 1.65 ppm |
| 2015-09-29 | Y152780010 | 1.23 ppm |
| 2015-10-27 | Y153030012 | 2.07 ppm |
| 2015-10-27 | Y153030009 | 1.93 ppm |
| 2015-10-27 | Y153030011 | 0.930 ppm |
| 2015-10-27 | Y153030013 | 1.53 ppm |
| 2015-10-27 | Y153030014 | 1.39 ppm |
| 2015-10-27 | Y153030010 | 1.74 ppm |
| 2015-11-04 | Y153130021 | 1.41 ppm |
| 2015-11-04 | Y153130020 | 1.13 ppm |
| 2015-11-24 | Y153340016 | 1.29 ppm |
| 2015-11-24 | Y153340011 | 1.44 ppm |
| 2015-11-24 | Y153340014 | 1.31 ppm |
| 2015-11-24 | Y153340012 | 1.38 ppm |
| 2015-11-24 | Y153340013 | 1.24 ppm |
| 2015-11-24 | Y153340015 | ND |
| 2015-12-21 | Y153570020 | 1.45 ppm |
| 2015-12-21 | Y153570019 | 1.34 ppm |
| 2015-12-21 | Y153570023 | 1.48 ppm |
| 2015-12-21 | Y153570021 | 1.65 ppm |
| 2015-12-21 | Y153570022 | 1.24 ppm |
| 2016-01-20 | Y160270006 | 1.18 ppm |
| 2016-01-20 | Y160270007 | 1.24 ppm |
| 2016-01-20 | Y160400044 | 1.30 ppm |
| 2016-01-27 | Y160320017 | 1.18 ppm |
| 2016-01-27 | Y160320018 | 1.71 ppm |
| 2016-01-27 | Y160320019 | 1.25 ppm |
| 2016-01-27 | Y160320020 | 1.22 ppm |
| 2016-02-24 | Y160610025 | ND |
| 2016-02-24 | Y160610026 | 1.53 ppm |
| 2016-02-24 | Y160610027 | ND |
| 2016-03-29 | Y160950006 | 1.58 ppm |
| 2016-03-29 | Y160950007 | 1.77 ppm |
| 2016-03-29 | Y160950010 | 1.18 ppm |
| 2016-03-29 | Y160950011 | 1.29 ppm |
| 2016-03-29 | Y160950016 | 1.28 ppm |
| 2016-04-25 | Y161240009 | 1.57 ppm |
| 2016-04-25 | Y161240010 | 1.04 ppm |
| 2016-04-25 | Y161240011 | 1.30 ppm |
| 2016-04-25 | Y161240012 | 0.360 ppm |
| 2016-04-25 | Y161240013 | 1.09 ppm |
| 2016-05-03 | Y161260046 | 1.50 ppm |
| 2016-05-03 | Y161300008 | 1.20 ppm |
| 2016-05-03 | Y161300009 | 1.06 ppm |
| 2016-05-31 | Y161580005 | 1.46 ppm |
| 2016-05-31 | Y161580006 | 1.22 ppm |
| 2016-05-31 | Y161580007 | 1.21 ppm |
| 2016-05-31 | Y161580008 | 0.280 ppm |
| 2016-05-31 | Y161580009 | 1.44 ppm |
| 2016-06-27 | Y161870025 | 1.01 ppm |
| 2016-06-27 | Y161870026 | 1.27 ppm |
| 2016-06-27 | Y161870027 | ND |
| 2016-06-27 | Y161870028 | 1.51 ppm |
| 2016-06-27 | Y161870029 | 1.40 ppm |
| 2016-06-27 | Y161870030 | 1.19 ppm |
| 2016-07-27 | Y162170032 | 1.30 ppm |
| 2016-07-27 | Y162170033 | 1.17 ppm |
| 2016-07-27 | Y162100017 | 1.14 ppm |
| 2016-07-28 | Y162170024 | 1.25 ppm |
| 2016-07-28 | Y162170026 | 1.34 ppm |
| 2016-07-28 | Y162170027 | 1.27 ppm |
| 2016-07-28 | Y162170028 | 1.20 ppm |
| 2016-07-28 | Y162170029 | 1.45 ppm |
| 2016-07-28 | Y162170030 | 1.03 ppm |
| 2016-08-05 | Y162420020 | 1.27 ppm |
| 2016-08-25 | Y162420019 | 1.16 ppm |
| 2016-08-25 | Y162420021 | 1.17 ppm |
| 2016-08-25 | Y162420022 | 1.67 ppm |
| 2016-08-25 | Y162420023 | 1.12 ppm |
| 2016-08-25 | Y162420024 | 1.14 ppm |
| 2016-09-22 | Y162700030 | 1.08 ppm |
| 2016-09-22 | Y162700031 | 1.24 ppm |
| 2016-09-22 | Y162700032 | 1.24 ppm |
| 2016-09-22 | Y162700033 | 1.30 ppm |
| 2016-09-22 | Y162700034 | 0.820 ppm |
| 2016-09-22 | Y162700035 | 1.14 ppm |
| 2016-10-19 | Y162980021 | 1.25 ppm |
| 2016-10-19 | Y162980022 | 0.680 ppm |
| 2016-10-19 | Y162980023 | 1.44 ppm |
| 2016-10-19 | Y162980018 | 0.880 ppm |
| 2016-10-19 | Y162980019 | 1.04 ppm |
| 2016-10-19 | Y162980020 | 0.800 ppm |
| 2016-11-08 | Y163140037 | 1.40 ppm |
| 2016-11-08 | Y163140038 | 1.22 ppm |
| 2016-11-08 | Y163140039 | 0.830 ppm |
| 2016-11-29 | Y163350001 | 0.840 ppm |
| 2016-11-29 | Y163350002 | 1.22 ppm |
| 2016-11-29 | Y163410001 | 0.670 ppm |
| 2016-11-29 | Y163350003 | 0.870 ppm |
| 2016-11-29 | Y163350004 | 0.680 ppm |
| 2016-11-29 | Y163350005 | 0.790 ppm |
| 2016-11-29 | Y163350006 | 1.64 ppm |
| 2016-12-21 | Y163620009 | 0.940 ppm |
| 2016-12-21 | Y163620005 | 1.08 ppm |
| 2016-12-21 | Y163620006 | 0.690 ppm |
| 2016-12-21 | Y163620007 | ND |
| 2016-12-21 | Y163620008 | 1.21 ppm |
| 2017-01-31 | Y170340059 | 0.660 ppm |
| 2017-01-31 | Y170340060 | 1.02 ppm |
| 2017-01-31 | Y170340061 | 1.33 ppm |
| 2017-01-31 | Y170340062 | 1.06 ppm |
| 2017-01-31 | Y170340063 | 1.24 ppm |
| 2017-01-31 | Y170340064 | 0.790 ppm |
| 2017-02-27 | Y170650012 | 0.870 ppm |
| 2017-02-27 | Y170650013 | 0.940 ppm |
| 2017-02-27 | Y170650014 | 0.820 ppm |
| 2017-02-27 | Y170650015 | 1.25 ppm |
| 2017-02-27 | Y170650016 | 1.40 ppm |
| 2017-03-29 | Y170930006 | 1.05 ppm |
| 2017-03-29 | Y170930007 | 1.23 ppm |
| 2017-03-29 | Y170930008 | 1.49 ppm |
| 2017-03-29 | Y170930009 | 0.950 ppm |
| 2017-03-29 | Y170930010 | 1.24 ppm |
| 2017-03-29 | Y170930011 | 1.29 ppm |
| 2017-04-26 | Y171210017 | 1.67 ppm |
| 2017-04-26 | Y171210018 | 1.20 ppm |
| 2017-04-26 | Y171210019 | 0.410 ppm |
| 2017-04-26 | Y171210020 | ND |
| 2017-04-26 | Y171210021 | 1.20 ppm |
| 2017-04-26 | Y171210022 | ND |
| 2017-05-25 | Y171500016 | ND |
| 2017-05-25 | Y171500017 | 0.700 ppm |
| 2017-05-25 | Y171500018 | 1.21 ppm |
| 2017-05-25 | Y171500019 | 1.06 ppm |
| 2017-06-27 | Y171840087 | 1.04 ppm |
| 2017-06-27 | Y171840088 | 0.940 ppm |
| 2017-06-27 | Y171840089 | 2.53 ppm |
| 2017-06-27 | Y171840090 | 0.980 ppm |
| 2017-06-27 | Y171840091 | 0.860 ppm |
| 2017-07-11 | Y171980032 | ND |
| 2017-07-11 | Y171980033 | 0.720 ppm |
| 2017-07-11 | Y171980034 | 1.39 ppm |
| 2017-07-11 | Y171980035 | 1.42 ppm |
| 2017-07-11 | Y171980036 | 1.03 ppm |
| 2017-07-11 | Y171980037 | 1.66 ppm |
| 2017-07-19 | Y172050031 | 0.950 ppm |
| 2017-07-31 | Y172190010 | 1.07 ppm |
| 2017-08-15 | Y172330017 | 0.940 ppm |
| 2017-08-29 | Y172480010 | 1.04 ppm |
| 2017-08-29 | Y172480011 | 0.920 ppm |
| 2017-08-29 | Y172480012 | 1.23 ppm |
| 2017-08-29 | Y172480013 | 0.820 ppm |
| 2017-08-29 | Y172480014 | 0.960 ppm |
| 2017-09-28 | Y172760014 | 0.940 ppm |
| 2017-09-28 | Y172760015 | 0.990 ppm |
| 2017-09-28 | Y172760016 | 1.08 ppm |
| 2017-09-28 | Y172760017 | 0.780 ppm |
| 2017-09-28 | Y172760018 | 1.50 ppm |
| 2017-10-25 | Y173030026 | 1.35 ppm |
| 2017-10-25 | Y173030027 | 1.08 ppm |
| 2017-10-25 | Y173030028 | 1.02 ppm |
| 2017-10-25 | Y173030029 | 0.710 ppm |
| 2017-10-25 | Y173030030 | 1.54 ppm |
| 2017-11-06 | Y173170030 | 0.930 ppm |
| 2017-11-06 | Y173170032 | 0.810 ppm |
| 2017-11-06 | Y173170033 | 0.850 ppm |
| 2017-11-06 | Y173170034 | 0.620 ppm |
| 2017-11-29 | Y173380017 | 0.850 ppm |
| 2017-11-29 | Y173380018 | 1.01 ppm |
| 2017-11-29 | Y173380019 | 1.000 ppm |
| 2017-11-29 | Y173380020 | 1.22 ppm |
| 2017-11-29 | Y173380021 | 0.880 ppm |
| 2017-11-29 | Y173380022 | 0.670 ppm |
| 2017-12-14 | Y173540060 | 0.980 ppm |
| 2017-12-14 | Y173540061 | 1.24 ppm |
| 2017-12-14 | Y173540062 | 0.750 ppm |
| 2017-12-14 | Y173540063 | 1.15 ppm |
| 2017-12-14 | Y173540064 | 1.16 ppm |
| 2018-01-30 | Y180360011 | 1.20 ppm |
| 2018-01-30 | Y180360009 | 0.960 ppm |
| 2018-01-30 | Y180360013 | 1.25 ppm |
| 2018-01-30 | Y180360010 | 0.910 ppm |
| 2018-02-27 | Y180590005 | 0.950 ppm |
| 2018-02-27 | Y180590004 | 1.16 ppm |
| 2018-02-27 | Y180590007 | 0.990 ppm |
| 2018-02-27 | Y180590010 | 0.740 ppm |
| 2018-03-27 | Y180920008 | 0.420 ppm |
| 2018-03-27 | Y180920006 | 0.730 ppm |
| 2018-03-27 | Y180920007 | 1.06 ppm |
| 2018-03-27 | Y180920009 | 1.04 ppm |
| 2018-03-27 | Y180920005 | 1.25 ppm |
| 2018-04-30 | Y181220017 | 1.12 ppm |
| 2018-04-30 | Y181220019 | 1.13 ppm |
| 2018-04-30 | Y181220016 | 1.34 ppm |
| 2018-04-30 | Y181220018 | 0.720 ppm |
| 2018-05-08 | Y181340001 | 0.800 ppm |
| 2018-05-31 | Y181550005 | 0.990 ppm |
| 2018-05-31 | Y181550007 | 1.21 ppm |
| 2018-05-31 | Y181550004 | 0.890 ppm |
| 2018-05-31 | Y181550008 | 1.15 ppm |
| 2018-05-31 | Y181550006 | 0.840 ppm |
| 2018-06-26 | Y181830015 | 0.790 ppm |
| 2018-06-26 | Y181830017 | 1.04 ppm |
| 2018-06-26 | Y181830016 | 1.36 ppm |
| 2018-06-26 | Y181830014 | 1.000 ppm |
| 2018-06-26 | Y181830018 | 1.29 ppm |
| 2018-07-30 | Y182190002 | 0.960 ppm |
| 2018-07-30 | Y182190005 | 1.02 ppm |
| 2018-07-30 | Y182190003 | 0.820 ppm |
| 2018-07-30 | Y182190004 | 1.65 ppm |
| 2018-07-30 | Y182190006 | 1.20 ppm |
| 2018-08-27 | Y182420009 | 1.32 ppm |
| 2018-08-27 | Y182420011 | 0.740 ppm |
| 2018-08-27 | Y182420010 | 0.760 ppm |
| 2018-08-27 | Y182420012 | 0.880 ppm |
| 2018-08-29 | Y182470011 | 1.24 ppm |
| 2018-08-29 | Y182470007 | 0.950 ppm |
| 2018-08-29 | Y182470008 | 0.720 ppm |
| 2018-08-29 | Y182470009 | 1.39 ppm |
| 2018-08-29 | Y182470010 | 1.26 ppm |
| 2018-09-25 | Y182750007 | 0.770 ppm |
| 2018-09-25 | Y182750011 | 1.16 ppm |
| 2018-09-25 | Y182750009 | 0.520 ppm |
| 2018-09-25 | Y182750008 | 1.08 ppm |
| 2018-09-25 | Y182750010 | 1.21 ppm |
| 2018-10-29 | Y183090013 | 0.940 ppm |
| 2018-10-29 | Y183090010 | 0.940 ppm |
| 2018-10-29 | Y183090014 | 0.860 ppm |
| 2018-10-29 | Y183090012 | 0.850 ppm |
| 2018-10-29 | Y183090011 | 1.57 ppm |
| 2018-10-29 | Y183090015 | 0.340 ppm |
| 2018-10-30 | Y183090004 | 1.26 ppm |
| 2018-10-30 | Y183090002 | 1.27 ppm |
| 2018-10-30 | Y183090001 | 1.23 ppm |
| 2018-10-30 | Y183090003 | 1.22 ppm |
| 2018-11-29 | Y183370025 | 1.15 ppm |
| 2018-11-29 | Y183370024 | 1.17 ppm |
| 2018-11-29 | Y183370023 | 0.810 ppm |
| 2018-11-29 | Y183370021 | 1.05 ppm |
| 2018-11-29 | Y183370022 | 1.51 ppm |
| 2018-11-29 | Y183370026 | 1.24 ppm |
| 2018-12-05 | Y183440043 | 1.15 ppm |
| 2018-12-05 | Y183440044 | 1.12 ppm |
| 2018-12-05 | Y183440040 | 1.34 ppm |
| 2018-12-05 | Y183440039 | 1.06 ppm |
| 2018-12-05 | Y183440041 | 1.08 ppm |
| 2018-12-05 | Y183440042 | 1.21 ppm |
| 2019-01-29 | Y190350018 | 1.31 ppm |
| 2019-01-29 | Y190350015 | 0.810 ppm |
| 2019-01-29 | Y190350014 | 0.870 ppm |
| 2019-01-29 | Y190350017 | 1.03 ppm |
| 2019-01-29 | Y190350016 | 1.06 ppm |
| 2019-01-29 | Y190350013 | 0.870 ppm |
| 2019-02-28 | Y190630019 | 1.11 ppm |
| 2019-02-28 | Y190630017 | 0.730 ppm |
| 2019-02-28 | Y190630016 | 0.550 ppm |
| 2019-02-28 | Y190630013 | 0.690 ppm |
| 2019-02-28 | Y190630018 | 1.15 ppm |
| 2019-02-28 | Y190630015 | 1.000 ppm |
| 2019-03-27 | Y190910022 | 1.04 ppm |
| 2019-03-27 | Y190910023 | 1.21 ppm |
| 2019-03-27 | Y190910025 | 1.20 ppm |
| 2019-03-27 | Y190910021 | 1.01 ppm |
| 2019-03-27 | Y190910026 | 1.24 ppm |
| 2019-03-27 | Y190910024 | 1.38 ppm |
| 2019-04-30 | Y191260013 | 0.850 ppm |
| 2019-04-30 | Y191260010 | 0.530 ppm |
| 2019-04-30 | Y191260008 | 0.900 ppm |
| 2019-04-30 | Y191260009 | 0.750 ppm |
| 2019-04-30 | Y191260012 | 0.540 ppm |
| 2019-04-30 | Y191260007 | 1.93 ppm |
| 2019-04-30 | Y191260011 | 1.02 ppm |
| 2019-04-30 | Y191210012 | 0.540 ppm |
| 2019-05-29 | Y191540021 | 1.38 ppm |
| 2019-05-29 | Y191540020 | 1.11 ppm |
| 2019-05-29 | Y191540019 | ND |
| 2019-05-29 | Y191540018 | 0.950 ppm |
| 2019-05-29 | Y191540022 | 0.320 ppm |
| 2019-06-25 | Y191820033 | ND |
| 2019-06-25 | Y191820032 | ND |
| 2019-06-25 | Y191820030 | 0.840 ppm |
| 2019-06-25 | Y191820034 | 0.950 ppm |
| 2019-06-25 | Y191820031 | 1.10 ppm |
| 2019-07-30 | Y192170003 | 0.900 ppm |
| 2019-07-30 | Y192170004 | 0.880 ppm |
| 2019-07-30 | Y192170005 | 1.14 ppm |
| 2019-07-30 | Y192170007 | 1.11 ppm |
| 2019-07-30 | Y192170006 | 1.30 ppm |
| 2019-08-28 | Y192530016 | 1.30 ppm |
| 2019-08-28 | Y192530015 | 0.660 ppm |
| 2019-08-28 | Y192530014 | 0.780 ppm |
| 2019-08-28 | Y192530017 | 1.17 ppm |
| 2019-09-16 | Y192660018 | 0.900 ppm |
| 2019-09-16 | Y192620007 | 1.08 ppm |
| 2019-09-25 | Y192750011 | 0.760 ppm |
| 2019-09-25 | Y192750013 | 1.38 ppm |
| 2019-09-25 | Y192750012 | 1.17 ppm |
| 2019-09-25 | Y192750014 | 1.16 ppm |
| 2019-10-29 | Y193100011 | 0.860 ppm |
| 2019-10-29 | Y193100013 | 1.17 ppm |
| 2019-10-29 | Y193100014 | 1.31 ppm |
| 2019-10-29 | Y193100012 | 1.09 ppm |
| 2019-11-21 | Y193290035 | 1.26 ppm |
| 2019-11-21 | Y193290033 | 1.18 ppm |
| 2019-11-21 | Y193290037 | 0.840 ppm |
| 2019-11-21 | Y193290034 | 1.29 ppm |
| 2019-11-25 | Y193370016 | 1.19 ppm |
| 2019-11-25 | Y193370014 | 1.36 ppm |
| 2019-11-25 | Y193370015 | 0.880 ppm |
| 2019-12-30 | Y200060002 | 1.20 ppm |
| 2019-12-30 | Y200060001 | 0.850 ppm |
| 2019-12-30 | Y200060003 | 1.25 ppm |
| 2019-12-30 | Y200060004 | 0.850 ppm |