Dibromochloromethane
Massachusetts Water Resources Authority (MWRA)
Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
721
Samples
0
Samples exceeding legal limit (MCL)
691
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.334 ppb | 26 | 12 | ND - 0.960 ppb |
| 2015 | 0.700 ppb | 154 | 141 | ND - 1.38 ppb |
| 2016 | 0.812 ppb | 130 | 129 | ND - 1.09 ppb |
| 2017 | 0.959 ppb | 130 | 130 | 0.630 ppb - 1.22 ppb |
| 2018 | 0.980 ppb | 145 | 144 | ND - 1.39 ppb |
| 2019 | 0.906 ppb | 136 | 135 | ND - 1.25 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.1 ppb
The EWG Health Guideline of 0.1 ppb for dibromochloromethane was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
ppb = parts per billion
All test results
| Date | Result |
|---|---|
| 2014-01-06 | 0.510 ppb |
| 2014-01-07 | ND |
| 2014-02-03 | ND |
| 2014-02-04 | ND |
| 2014-03-03 | ND |
| 2014-03-03 | ND |
| 2014-04-07 | ND |
| 2014-04-07 | 0.660 ppb |
| 2014-05-05 | ND |
| 2014-05-05 | 0.600 ppb |
| 2014-06-02 | 0.820 ppb |
| 2014-06-06 | ND |
| 2014-07-07 | 0.710 ppb |
| 2014-07-08 | ND |
| 2014-08-05 | ND |
| 2014-08-05 | 0.750 ppb |
| 2014-09-09 | ND |
| 2014-09-09 | 0.890 ppb |
| 2014-10-06 | 0.960 ppb |
| 2014-10-06 | 0.890 ppb |
| 2014-10-07 | ND |
| 2014-10-07 | ND |
| 2014-11-04 | 0.560 ppb |
| 2014-11-04 | 0.770 ppb |
| 2014-12-01 | 0.570 ppb |
| 2014-12-02 | ND |
| 2015-01-05 | 0.660 ppb |
| 2015-01-06 | ND |
| 2015-02-02 | 0.580 ppb |
| 2015-02-03 | ND |
| 2015-02-17 | 0.580 ppb |
| 2015-02-17 | 0.500 ppb |
| 2015-02-17 | 0.550 ppb |
| 2015-02-17 | 0.580 ppb |
| 2015-02-17 | 0.540 ppb |
| 2015-02-17 | 0.590 ppb |
| 2015-02-17 | 0.560 ppb |
| 2015-02-17 | 0.610 ppb |
| 2015-02-17 | 0.600 ppb |
| 2015-02-18 | 0.530 ppb |
| 2015-02-18 | 0.600 ppb |
| 2015-02-18 | 0.500 ppb |
| 2015-02-18 | 0.580 ppb |
| 2015-02-18 | 0.580 ppb |
| 2015-02-18 | 0.570 ppb |
| 2015-02-18 | 0.580 ppb |
| 2015-02-18 | 0.570 ppb |
| 2015-02-18 | 0.580 ppb |
| 2015-02-18 | 0.570 ppb |
| 2015-02-18 | 0.570 ppb |
| 2015-02-19 | 0.510 ppb |
| 2015-02-19 | 0.560 ppb |
| 2015-02-19 | 0.540 ppb |
| 2015-02-19 | 0.530 ppb |
| 2015-02-19 | 0.500 ppb |
| 2015-02-19 | 0.550 ppb |
| 2015-02-19 | 0.560 ppb |
| 2015-02-19 | 0.540 ppb |
| 2015-02-19 | 0.540 ppb |
| 2015-02-19 | 0.570 ppb |
| 2015-02-19 | ND |
| 2015-02-19 | 0.550 ppb |
| 2015-03-02 | ND |
| 2015-03-03 | ND |
| 2015-04-06 | 0.600 ppb |
| 2015-04-07 | ND |
| 2015-05-04 | ND |
| 2015-05-04 | 1.04 ppb |
| 2015-05-18 | 0.900 ppb |
| 2015-05-18 | 0.910 ppb |
| 2015-05-18 | 0.890 ppb |
| 2015-05-18 | 0.800 ppb |
| 2015-05-18 | 0.890 ppb |
| 2015-05-18 | 0.870 ppb |
| 2015-05-19 | 0.840 ppb |
| 2015-05-19 | 0.830 ppb |
| 2015-05-19 | 0.760 ppb |
| 2015-05-19 | 0.860 ppb |
| 2015-05-19 | 0.820 ppb |
| 2015-05-19 | 0.770 ppb |
| 2015-05-19 | 0.760 ppb |
| 2015-05-19 | 0.770 ppb |
| 2015-05-19 | 0.920 ppb |
| 2015-05-20 | 0.890 ppb |
| 2015-05-20 | 0.840 ppb |
| 2015-05-20 | 0.780 ppb |
| 2015-05-20 | 0.750 ppb |
| 2015-05-20 | 0.800 ppb |
| 2015-05-20 | 0.820 ppb |
| 2015-05-20 | 0.870 ppb |
| 2015-05-20 | 0.770 ppb |
| 2015-05-21 | 0.790 ppb |
| 2015-05-21 | 0.680 ppb |
| 2015-05-21 | 0.720 ppb |
| 2015-05-21 | 0.800 ppb |
| 2015-05-21 | 1.38 ppb |
| 2015-05-21 | 0.830 ppb |
| 2015-05-21 | 0.710 ppb |
| 2015-05-21 | 0.670 ppb |
| 2015-05-22 | 0.560 ppb |
| 2015-06-01 | 0.570 ppb |
| 2015-06-02 | ND |
| 2015-07-06 | 0.790 ppb |
| 2015-07-07 | ND |
| 2015-08-03 | 0.820 ppb |
| 2015-08-04 | ND |
| 2015-08-17 | 0.770 ppb |
| 2015-08-17 | 0.750 ppb |
| 2015-08-17 | 0.840 ppb |
| 2015-08-17 | 0.920 ppb |
| 2015-08-17 | 0.840 ppb |
| 2015-08-17 | 0.880 ppb |
| 2015-08-17 | 0.850 ppb |
| 2015-08-17 | 0.790 ppb |
| 2015-08-17 | 0.860 ppb |
| 2015-08-18 | 0.700 ppb |
| 2015-08-18 | 0.720 ppb |
| 2015-08-18 | 0.650 ppb |
| 2015-08-18 | 0.920 ppb |
| 2015-08-18 | 0.810 ppb |
| 2015-08-18 | 0.950 ppb |
| 2015-08-18 | 0.930 ppb |
| 2015-08-19 | 0.820 ppb |
| 2015-08-19 | 0.860 ppb |
| 2015-08-19 | 0.950 ppb |
| 2015-08-19 | 0.580 ppb |
| 2015-08-19 | 0.910 ppb |
| 2015-08-19 | 0.810 ppb |
| 2015-08-19 | 0.580 ppb |
| 2015-08-19 | 0.870 ppb |
| 2015-08-20 | 0.920 ppb |
| 2015-08-20 | 0.910 ppb |
| 2015-08-20 | 0.890 ppb |
| 2015-08-20 | 0.860 ppb |
| 2015-08-20 | 0.990 ppb |
| 2015-08-20 | 0.930 ppb |
| 2015-08-20 | 0.850 ppb |
| 2015-08-20 | 0.910 ppb |
| 2015-09-08 | ND |
| 2015-09-08 | 0.680 ppb |
| 2015-10-05 | 0.640 ppb |
| 2015-10-06 | ND |
| 2015-10-20 | ND |
| 2015-10-20 | 0.900 ppb |
| 2015-11-02 | 0.830 ppb |
| 2015-11-03 | 0.570 ppb |
| 2015-11-16 | 0.860 ppb |
| 2015-11-16 | 0.830 ppb |
| 2015-11-16 | 0.920 ppb |
| 2015-11-16 | 0.860 ppb |
| 2015-11-16 | 0.940 ppb |
| 2015-11-16 | 0.940 ppb |
| 2015-11-16 | 0.880 ppb |
| 2015-11-16 | 0.900 ppb |
| 2015-11-16 | 0.800 ppb |
| 2015-11-17 | 0.760 ppb |
| 2015-11-17 | 0.830 ppb |
| 2015-11-17 | 0.900 ppb |
| 2015-11-17 | 1.000 ppb |
| 2015-11-17 | 0.930 ppb |
| 2015-11-17 | 0.900 ppb |
| 2015-11-17 | 1.01 ppb |
| 2015-11-18 | 0.900 ppb |
| 2015-11-18 | 0.840 ppb |
| 2015-11-18 | 0.850 ppb |
| 2015-11-18 | 0.870 ppb |
| 2015-11-18 | 0.850 ppb |
| 2015-11-18 | 0.890 ppb |
| 2015-11-18 | 0.630 ppb |
| 2015-11-18 | 0.960 ppb |
| 2015-11-19 | 0.720 ppb |
| 2015-11-19 | 0.690 ppb |
| 2015-11-19 | 0.780 ppb |
| 2015-11-19 | 0.950 ppb |
| 2015-11-19 | 0.880 ppb |
| 2015-11-19 | 0.870 ppb |
| 2015-11-19 | 0.880 ppb |
| 2015-11-19 | 0.720 ppb |
| 2015-12-07 | 0.690 ppb |
| 2015-12-08 | 0.540 ppb |
| 2016-02-16 | 0.830 ppb |
| 2016-02-16 | 0.690 ppb |
| 2016-02-16 | 0.730 ppb |
| 2016-02-16 | 0.800 ppb |
| 2016-02-16 | 0.790 ppb |
| 2016-02-16 | 0.700 ppb |
| 2016-02-16 | 0.750 ppb |
| 2016-02-16 | 0.790 ppb |
| 2016-02-16 | 0.810 ppb |
| 2016-02-17 | 0.730 ppb |
| 2016-02-17 | 0.540 ppb |
| 2016-02-17 | 0.660 ppb |
| 2016-02-17 | 0.600 ppb |
| 2016-02-17 | 0.770 ppb |
| 2016-02-17 | 0.720 ppb |
| 2016-02-17 | 0.730 ppb |
| 2016-02-17 | 0.570 ppb |
| 2016-02-17 | 0.600 ppb |
| 2016-02-17 | 0.580 ppb |
| 2016-02-17 | 0.770 ppb |
| 2016-02-18 | 0.790 ppb |
| 2016-02-18 | ND |
| 2016-02-18 | 0.720 ppb |
| 2016-02-18 | 0.760 ppb |
| 2016-02-18 | 0.690 ppb |
| 2016-02-18 | 0.800 ppb |
| 2016-02-18 | 0.550 ppb |
| 2016-02-18 | 0.720 ppb |
| 2016-02-18 | 0.840 ppb |
| 2016-02-18 | 0.540 ppb |
| 2016-02-18 | 0.590 ppb |
| 2016-02-18 | 0.530 ppb |
| 2016-05-16 | 0.960 ppb |
| 2016-05-16 | 0.870 ppb |
| 2016-05-16 | 0.950 ppb |
| 2016-05-16 | 0.870 ppb |
| 2016-05-16 | 1.04 ppb |
| 2016-05-16 | 1.09 ppb |
| 2016-05-16 | 1.02 ppb |
| 2016-05-16 | 0.960 ppb |
| 2016-05-16 | 0.860 ppb |
| 2016-05-17 | 1.000 ppb |
| 2016-05-17 | 0.880 ppb |
| 2016-05-17 | 1.08 ppb |
| 2016-05-17 | 0.960 ppb |
| 2016-05-17 | 1.08 ppb |
| 2016-05-17 | 1.01 ppb |
| 2016-05-17 | 1.02 ppb |
| 2016-05-18 | 0.990 ppb |
| 2016-05-18 | 1.02 ppb |
| 2016-05-18 | 0.960 ppb |
| 2016-05-18 | 0.950 ppb |
| 2016-05-18 | 0.980 ppb |
| 2016-05-18 | 1.05 ppb |
| 2016-05-18 | 0.990 ppb |
| 2016-05-18 | 0.990 ppb |
| 2016-05-19 | 0.890 ppb |
| 2016-05-19 | 1.01 ppb |
| 2016-05-19 | 1.05 ppb |
| 2016-05-19 | 0.850 ppb |
| 2016-05-19 | 0.900 ppb |
| 2016-05-19 | 0.920 ppb |
| 2016-05-19 | 0.860 ppb |
| 2016-05-19 | 0.930 ppb |
| 2016-08-15 | 0.790 ppb |
| 2016-08-15 | 0.710 ppb |
| 2016-08-15 | 0.870 ppb |
| 2016-08-15 | 0.870 ppb |
| 2016-08-15 | 0.880 ppb |
| 2016-08-15 | 0.890 ppb |
| 2016-08-15 | 0.860 ppb |
| 2016-08-15 | 0.830 ppb |
| 2016-08-15 | 0.920 ppb |
| 2016-08-16 | 0.870 ppb |
| 2016-08-16 | 0.730 ppb |
| 2016-08-16 | 0.910 ppb |
| 2016-08-16 | 0.850 ppb |
| 2016-08-16 | 0.950 ppb |
| 2016-08-16 | 0.860 ppb |
| 2016-08-16 | 0.990 ppb |
| 2016-08-17 | 0.870 ppb |
| 2016-08-17 | 0.910 ppb |
| 2016-08-17 | 0.980 ppb |
| 2016-08-17 | 0.880 ppb |
| 2016-08-17 | 0.920 ppb |
| 2016-08-17 | 0.900 ppb |
| 2016-08-17 | 0.880 ppb |
| 2016-08-17 | 0.880 ppb |
| 2016-08-17 | 0.940 ppb |
| 2016-08-18 | 0.870 ppb |
| 2016-08-18 | 0.870 ppb |
| 2016-08-18 | 0.880 ppb |
| 2016-08-18 | 0.880 ppb |
| 2016-08-18 | 0.910 ppb |
| 2016-08-18 | 0.960 ppb |
| 2016-08-18 | 0.880 ppb |
| 2016-10-18 | 0.680 ppb |
| 2016-10-18 | 0.780 ppb |
| 2016-11-14 | 0.770 ppb |
| 2016-11-14 | 0.680 ppb |
| 2016-11-14 | 0.760 ppb |
| 2016-11-14 | 0.790 ppb |
| 2016-11-14 | 0.870 ppb |
| 2016-11-14 | 0.820 ppb |
| 2016-11-14 | 0.770 ppb |
| 2016-11-14 | 0.650 ppb |
| 2016-11-14 | 0.650 ppb |
| 2016-11-15 | 0.770 ppb |
| 2016-11-15 | 0.790 ppb |
| 2016-11-15 | 0.750 ppb |
| 2016-11-15 | 0.870 ppb |
| 2016-11-15 | 0.770 ppb |
| 2016-11-15 | 0.740 ppb |
| 2016-11-15 | 0.780 ppb |
| 2016-11-16 | 0.610 ppb |
| 2016-11-16 | 0.650 ppb |
| 2016-11-16 | 0.630 ppb |
| 2016-11-16 | 0.650 ppb |
| 2016-11-16 | 0.830 ppb |
| 2016-11-16 | 0.840 ppb |
| 2016-11-16 | 0.700 ppb |
| 2016-11-16 | 0.800 ppb |
| 2016-11-16 | 0.610 ppb |
| 2016-11-17 | 0.770 ppb |
| 2016-11-17 | 0.710 ppb |
| 2016-11-17 | 0.670 ppb |
| 2016-11-17 | 0.690 ppb |
| 2016-11-17 | 0.540 ppb |
| 2016-11-17 | 0.710 ppb |
| 2016-11-17 | 0.560 ppb |
| 2017-02-13 | 0.890 ppb |
| 2017-02-13 | 0.640 ppb |
| 2017-02-13 | 0.910 ppb |
| 2017-02-13 | 0.880 ppb |
| 2017-02-13 | 0.910 ppb |
| 2017-02-13 | 0.940 ppb |
| 2017-02-13 | 0.850 ppb |
| 2017-02-13 | 0.930 ppb |
| 2017-02-13 | 0.780 ppb |
| 2017-02-14 | 0.820 ppb |
| 2017-02-14 | 0.890 ppb |
| 2017-02-14 | 0.810 ppb |
| 2017-02-14 | 0.880 ppb |
| 2017-02-14 | 0.930 ppb |
| 2017-02-14 | 0.850 ppb |
| 2017-02-14 | 0.880 ppb |
| 2017-02-15 | 0.910 ppb |
| 2017-02-15 | 0.840 ppb |
| 2017-02-15 | 0.930 ppb |
| 2017-02-15 | 0.630 ppb |
| 2017-02-15 | 0.820 ppb |
| 2017-02-15 | 0.960 ppb |
| 2017-02-15 | 0.830 ppb |
| 2017-02-15 | 0.810 ppb |
| 2017-02-16 | 0.950 ppb |
| 2017-02-16 | 0.920 ppb |
| 2017-02-16 | 0.910 ppb |
| 2017-02-16 | 0.940 ppb |
| 2017-02-16 | 0.960 ppb |
| 2017-02-16 | 0.900 ppb |
| 2017-02-16 | 0.880 ppb |
| 2017-02-16 | 1.000 ppb |
| 2017-05-15 | 0.880 ppb |
| 2017-05-15 | 0.840 ppb |
| 2017-05-15 | 0.980 ppb |
| 2017-05-15 | 0.920 ppb |
| 2017-05-15 | 0.970 ppb |
| 2017-05-15 | 0.980 ppb |
| 2017-05-15 | 0.990 ppb |
| 2017-05-15 | 0.910 ppb |
| 2017-05-15 | 0.780 ppb |
| 2017-05-16 | 0.880 ppb |
| 2017-05-16 | 0.900 ppb |
| 2017-05-16 | 0.930 ppb |
| 2017-05-16 | 0.950 ppb |
| 2017-05-16 | 0.910 ppb |
| 2017-05-17 | 0.940 ppb |
| 2017-05-17 | 0.880 ppb |
| 2017-05-17 | 0.930 ppb |
| 2017-05-17 | 0.930 ppb |
| 2017-05-17 | 1.02 ppb |
| 2017-05-17 | 0.920 ppb |
| 2017-05-17 | 1.000 ppb |
| 2017-05-17 | 0.900 ppb |
| 2017-05-18 | 0.940 ppb |
| 2017-05-18 | 0.960 ppb |
| 2017-05-18 | 0.940 ppb |
| 2017-05-18 | 0.960 ppb |
| 2017-05-18 | 1.02 ppb |
| 2017-05-18 | 0.980 ppb |
| 2017-05-18 | 0.990 ppb |
| 2017-05-18 | 0.980 ppb |
| 2017-05-18 | 1.02 ppb |
| 2017-05-18 | 0.950 ppb |
| 2017-08-14 | 0.920 ppb |
| 2017-08-14 | 0.910 ppb |
| 2017-08-14 | 0.980 ppb |
| 2017-08-14 | 0.950 ppb |
| 2017-08-14 | 1.06 ppb |
| 2017-08-14 | 1.05 ppb |
| 2017-08-14 | 0.960 ppb |
| 2017-08-14 | 1.06 ppb |
| 2017-08-14 | 0.980 ppb |
| 2017-08-15 | 0.990 ppb |
| 2017-08-15 | 1.05 ppb |
| 2017-08-15 | 1.02 ppb |
| 2017-08-15 | 1.06 ppb |
| 2017-08-15 | 0.920 ppb |
| 2017-08-16 | 1.07 ppb |
| 2017-08-16 | 1.18 ppb |
| 2017-08-16 | 0.880 ppb |
| 2017-08-16 | 0.940 ppb |
| 2017-08-16 | 1.08 ppb |
| 2017-08-16 | 1.10 ppb |
| 2017-08-16 | 1.04 ppb |
| 2017-08-16 | 1.11 ppb |
| 2017-08-16 | 0.980 ppb |
| 2017-08-16 | 0.980 ppb |
| 2017-08-17 | 0.950 ppb |
| 2017-08-17 | 1.000 ppb |
| 2017-08-17 | 1.14 ppb |
| 2017-08-17 | 0.840 ppb |
| 2017-08-17 | 0.920 ppb |
| 2017-08-17 | 0.930 ppb |
| 2017-08-17 | 0.980 ppb |
| 2017-08-17 | 1.12 ppb |
| 2017-10-17 | 0.720 ppb |
| 2017-10-17 | 1.02 ppb |
| 2017-11-13 | 0.890 ppb |
| 2017-11-13 | 1.08 ppb |
| 2017-11-13 | 1.000 ppb |
| 2017-11-13 | 1.07 ppb |
| 2017-11-13 | 0.970 ppb |
| 2017-11-13 | 1.01 ppb |
| 2017-11-13 | 1.000 ppb |
| 2017-11-13 | 1.17 ppb |
| 2017-11-13 | 1.22 ppb |
| 2017-11-14 | 0.960 ppb |
| 2017-11-14 | 1.10 ppb |
| 2017-11-14 | 1.08 ppb |
| 2017-11-14 | 1.04 ppb |
| 2017-11-14 | 1.10 ppb |
| 2017-11-15 | 0.960 ppb |
| 2017-11-15 | 1.09 ppb |
| 2017-11-15 | 0.940 ppb |
| 2017-11-15 | 0.970 ppb |
| 2017-11-15 | 1.000 ppb |
| 2017-11-15 | 1.04 ppb |
| 2017-11-15 | 1.09 ppb |
| 2017-11-15 | 0.990 ppb |
| 2017-11-15 | 1.01 ppb |
| 2017-11-15 | 0.920 ppb |
| 2017-11-16 | 1.05 ppb |
| 2017-11-16 | 0.990 ppb |
| 2017-11-16 | 1.000 ppb |
| 2017-11-16 | 0.880 ppb |
| 2017-11-16 | 1.03 ppb |
| 2017-11-16 | 1.01 ppb |
| 2017-11-16 | 1.01 ppb |
| 2017-11-16 | 0.990 ppb |
| 2018-02-12 | 0.790 ppb |
| 2018-02-12 | 0.770 ppb |
| 2018-02-12 | 0.790 ppb |
| 2018-02-12 | 0.840 ppb |
| 2018-02-12 | 0.830 ppb |
| 2018-02-12 | 0.770 ppb |
| 2018-02-12 | 0.850 ppb |
| 2018-02-12 | 0.810 ppb |
| 2018-02-13 | 0.870 ppb |
| 2018-02-13 | 0.810 ppb |
| 2018-02-13 | 0.780 ppb |
| 2018-02-13 | 0.860 ppb |
| 2018-02-13 | 0.820 ppb |
| 2018-02-14 | 0.860 ppb |
| 2018-02-14 | 0.820 ppb |
| 2018-02-14 | 0.850 ppb |
| 2018-02-14 | 0.740 ppb |
| 2018-02-14 | 0.860 ppb |
| 2018-02-14 | 0.850 ppb |
| 2018-02-14 | 0.840 ppb |
| 2018-02-14 | 0.880 ppb |
| 2018-02-14 | 0.840 ppb |
| 2018-02-14 | 0.860 ppb |
| 2018-02-14 | 0.780 ppb |
| 2018-02-15 | 0.830 ppb |
| 2018-02-15 | 0.870 ppb |
| 2018-02-15 | 0.820 ppb |
| 2018-02-15 | 0.870 ppb |
| 2018-02-15 | 0.810 ppb |
| 2018-02-15 | 0.830 ppb |
| 2018-02-15 | 0.850 ppb |
| 2018-02-15 | 0.860 ppb |
| 2018-05-01 | 1.17 ppb |
| 2018-05-14 | 1.22 ppb |
| 2018-05-14 | 1.12 ppb |
| 2018-05-14 | 1.26 ppb |
| 2018-05-14 | 1.11 ppb |
| 2018-05-14 | 1.27 ppb |
| 2018-05-14 | 1.35 ppb |
| 2018-05-14 | 1.10 ppb |
| 2018-05-14 | 1.32 ppb |
| 2018-05-14 | 1.10 ppb |
| 2018-05-15 | 1.32 ppb |
| 2018-05-15 | 1.23 ppb |
| 2018-05-15 | 1.22 ppb |
| 2018-05-15 | 1.24 ppb |
| 2018-05-15 | 1.34 ppb |
| 2018-05-15 | 1.25 ppb |
| 2018-05-15 | 1.23 ppb |
| 2018-05-16 | 1.23 ppb |
| 2018-05-16 | 1.35 ppb |
| 2018-05-16 | 1.27 ppb |
| 2018-05-16 | 1.18 ppb |
| 2018-05-16 | 1.24 ppb |
| 2018-05-16 | 1.31 ppb |
| 2018-05-16 | 1.18 ppb |
| 2018-05-16 | 1.25 ppb |
| 2018-05-16 | 1.32 ppb |
| 2018-05-17 | 1.24 ppb |
| 2018-05-17 | 1.28 ppb |
| 2018-05-17 | 1.30 ppb |
| 2018-05-17 | 1.23 ppb |
| 2018-05-17 | 1.29 ppb |
| 2018-05-17 | 1.24 ppb |
| 2018-05-17 | 1.39 ppb |
| 2018-06-21 | 1.19 ppb |
| 2018-06-21 | 1.08 ppb |
| 2018-06-21 | 1.000 ppb |
| 2018-06-21 | 0.990 ppb |
| 2018-06-21 | 1.15 ppb |
| 2018-06-21 | 1.23 ppb |
| 2018-06-21 | 1.03 ppb |
| 2018-08-01 | 1.000 ppb |
| 2018-08-01 | 0.970 ppb |
| 2018-08-01 | 0.910 ppb |
| 2018-08-02 | 0.870 ppb |
| 2018-08-02 | 0.950 ppb |
| 2018-08-02 | 0.920 ppb |
| 2018-08-02 | 0.870 ppb |
| 2018-08-13 | 0.840 ppb |
| 2018-08-13 | 0.870 ppb |
| 2018-08-13 | 0.870 ppb |
| 2018-08-14 | 0.770 ppb |
| 2018-08-14 | 0.750 ppb |
| 2018-08-14 | 0.900 ppb |
| 2018-08-14 | 0.830 ppb |
| 2018-08-14 | 0.820 ppb |
| 2018-08-15 | 0.720 ppb |
| 2018-08-15 | 0.760 ppb |
| 2018-08-15 | 0.660 ppb |
| 2018-08-15 | 0.790 ppb |
| 2018-08-15 | 0.770 ppb |
| 2018-08-15 | 0.730 ppb |
| 2018-08-15 | 0.790 ppb |
| 2018-08-15 | 0.770 ppb |
| 2018-08-16 | 0.810 ppb |
| 2018-08-16 | 0.810 ppb |
| 2018-08-16 | 1.01 ppb |
| 2018-08-16 | 0.740 ppb |
| 2018-08-16 | 0.770 ppb |
| 2018-08-16 | 0.740 ppb |
| 2018-08-16 | 0.730 ppb |
| 2018-08-16 | 0.940 ppb |
| 2018-08-16 | 0.650 ppb |
| 2018-08-16 | 0.830 ppb |
| 2018-08-16 | 1.05 ppb |
| 2018-08-16 | 1.03 ppb |
| 2018-08-16 | 0.740 ppb |
| 2018-08-16 | 0.730 ppb |
| 2018-08-16 | 0.850 ppb |
| 2018-08-16 | 0.740 ppb |
| 2018-10-16 | ND |
| 2018-10-16 | 0.980 ppb |
| 2018-11-14 | 1.09 ppb |
| 2018-11-14 | 0.990 ppb |
| 2018-11-14 | 0.950 ppb |
| 2018-11-14 | 1.14 ppb |
| 2018-11-14 | 1.02 ppb |
| 2018-11-14 | 1.15 ppb |
| 2018-11-14 | 1.04 ppb |
| 2018-11-14 | 1.15 ppb |
| 2018-11-14 | 1.15 ppb |
| 2018-11-14 | 1.10 ppb |
| 2018-11-14 | 1.09 ppb |
| 2018-11-14 | 1.000 ppb |
| 2018-11-14 | 1.06 ppb |
| 2018-11-14 | 1.000 ppb |
| 2018-11-15 | 0.900 ppb |
| 2018-11-15 | 0.940 ppb |
| 2018-11-15 | 0.800 ppb |
| 2018-11-15 | 1.16 ppb |
| 2018-11-15 | 1.15 ppb |
| 2018-11-15 | 1.22 ppb |
| 2018-11-15 | 1.12 ppb |
| 2018-11-15 | 1.08 ppb |
| 2018-11-15 | 1.01 ppb |
| 2018-11-15 | 1.08 ppb |
| 2018-11-16 | 0.910 ppb |
| 2018-11-16 | 1.06 ppb |
| 2018-11-16 | 0.880 ppb |
| 2018-11-16 | 1.02 ppb |
| 2018-11-16 | 1.13 ppb |
| 2018-11-16 | 1.06 ppb |
| 2018-11-16 | 1.15 ppb |
| 2018-11-16 | 0.930 ppb |
| 2019-02-19 | 0.880 ppb |
| 2019-02-19 | 0.830 ppb |
| 2019-02-19 | 0.890 ppb |
| 2019-02-19 | 0.820 ppb |
| 2019-02-19 | 0.930 ppb |
| 2019-02-19 | 0.880 ppb |
| 2019-02-20 | 0.910 ppb |
| 2019-02-20 | 0.860 ppb |
| 2019-02-20 | 0.890 ppb |
| 2019-02-20 | 0.900 ppb |
| 2019-02-20 | 0.910 ppb |
| 2019-02-20 | 0.900 ppb |
| 2019-02-20 | 0.770 ppb |
| 2019-02-20 | 0.880 ppb |
| 2019-02-20 | 0.880 ppb |
| 2019-02-21 | 0.830 ppb |
| 2019-02-21 | 0.790 ppb |
| 2019-02-21 | 0.840 ppb |
| 2019-02-21 | 0.950 ppb |
| 2019-02-21 | 0.910 ppb |
| 2019-02-21 | 0.880 ppb |
| 2019-02-21 | 0.790 ppb |
| 2019-02-21 | 0.940 ppb |
| 2019-02-22 | 0.890 ppb |
| 2019-02-22 | 0.790 ppb |
| 2019-02-22 | 0.820 ppb |
| 2019-02-22 | 0.940 ppb |
| 2019-02-22 | 0.810 ppb |
| 2019-02-22 | 0.880 ppb |
| 2019-02-22 | 0.910 ppb |
| 2019-02-22 | 0.900 ppb |
| 2019-02-22 | 0.920 ppb |
| 2019-05-20 | 1.03 ppb |
| 2019-05-20 | 0.940 ppb |
| 2019-05-20 | 1.15 ppb |
| 2019-05-20 | 1.09 ppb |
| 2019-05-20 | 1.10 ppb |
| 2019-05-20 | 1.12 ppb |
| 2019-05-20 | 1.11 ppb |
| 2019-05-20 | 1.08 ppb |
| 2019-05-20 | 1.12 ppb |
| 2019-05-20 | 1.12 ppb |
| 2019-05-21 | 1.18 ppb |
| 2019-05-21 | 0.820 ppb |
| 2019-05-21 | 1.14 ppb |
| 2019-05-21 | 1.11 ppb |
| 2019-05-22 | 1.25 ppb |
| 2019-05-22 | 1.18 ppb |
| 2019-05-23 | 1.17 ppb |
| 2019-05-23 | 1.15 ppb |
| 2019-05-23 | 1.07 ppb |
| 2019-05-23 | 1.12 ppb |
| 2019-05-23 | 1.11 ppb |
| 2019-05-23 | 1.11 ppb |
| 2019-05-23 | 1.19 ppb |
| 2019-05-23 | 1.15 ppb |
| 2019-05-23 | 1.14 ppb |
| 2019-05-23 | 1.16 ppb |
| 2019-05-23 | 1.09 ppb |
| 2019-05-23 | 1.17 ppb |
| 2019-05-23 | 1.08 ppb |
| 2019-05-23 | 1.17 ppb |
| 2019-05-24 | 1.19 ppb |
| 2019-05-24 | 1.15 ppb |
| 2019-05-24 | 1.14 ppb |
| 2019-08-19 | 0.790 ppb |
| 2019-08-19 | 0.830 ppb |
| 2019-08-19 | 0.810 ppb |
| 2019-08-19 | 0.920 ppb |
| 2019-08-19 | 0.860 ppb |
| 2019-08-19 | 0.820 ppb |
| 2019-08-19 | 0.950 ppb |
| 2019-08-20 | 0.770 ppb |
| 2019-08-20 | 0.780 ppb |
| 2019-08-20 | 0.730 ppb |
| 2019-08-20 | 0.820 ppb |
| 2019-08-20 | 0.820 ppb |
| 2019-08-20 | 0.920 ppb |
| 2019-08-20 | 0.730 ppb |
| 2019-08-20 | 0.860 ppb |
| 2019-08-20 | 0.800 ppb |
| 2019-08-22 | 0.890 ppb |
| 2019-08-22 | 0.820 ppb |
| 2019-08-22 | 0.850 ppb |
| 2019-08-22 | 0.810 ppb |
| 2019-08-22 | 0.870 ppb |
| 2019-08-22 | 0.830 ppb |
| 2019-08-22 | 0.840 ppb |
| 2019-08-22 | 0.830 ppb |
| 2019-08-22 | 0.770 ppb |
| 2019-08-23 | 0.960 ppb |
| 2019-08-23 | 0.780 ppb |
| 2019-08-23 | 0.830 ppb |
| 2019-08-23 | 0.930 ppb |
| 2019-08-23 | 0.880 ppb |
| 2019-08-23 | 0.900 ppb |
| 2019-08-23 | 0.840 ppb |
| 2019-08-23 | 0.890 ppb |
| 2019-09-25 | 0.870 ppb |
| 2019-09-25 | 0.910 ppb |
| 2019-09-25 | 1.04 ppb |
| 2019-10-15 | ND |
| 2019-10-15 | 1.13 ppb |
| 2019-11-18 | 0.800 ppb |
| 2019-11-18 | 0.740 ppb |
| 2019-11-18 | 0.780 ppb |
| 2019-11-18 | 0.770 ppb |
| 2019-11-18 | 0.910 ppb |
| 2019-11-18 | 0.820 ppb |
| 2019-11-18 | 0.820 ppb |
| 2019-11-18 | 0.820 ppb |
| 2019-11-18 | 0.780 ppb |
| 2019-11-18 | 0.860 ppb |
| 2019-11-19 | 0.680 ppb |
| 2019-11-19 | 0.840 ppb |
| 2019-11-19 | 0.850 ppb |
| 2019-11-19 | 0.830 ppb |
| 2019-11-19 | 0.790 ppb |
| 2019-11-20 | 0.840 ppb |
| 2019-11-20 | 0.770 ppb |
| 2019-11-20 | 0.800 ppb |
| 2019-11-20 | 0.880 ppb |
| 2019-11-21 | 0.780 ppb |
| 2019-11-21 | 0.830 ppb |
| 2019-11-21 | 0.840 ppb |
| 2019-11-21 | 0.880 ppb |
| 2019-11-21 | 0.860 ppb |
| 2019-11-21 | 0.740 ppb |
| 2019-11-21 | 0.720 ppb |
| 2019-11-22 | 0.760 ppb |
| 2019-11-22 | 0.850 ppb |
| 2019-11-22 | 0.810 ppb |
| 2019-11-22 | 0.840 ppb |
| 2019-11-22 | 0.720 ppb |
| 2019-11-22 | 0.860 ppb |
| 2019-11-22 | 0.880 ppb |