Chloroform
Sonoma County Water Agency
Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Read More.
In addition to tap water disinfection, chloroform pollution in the environment also comes from industrial discharges from pulp and paper mills, and from urban wastewater effluent. Human studies show that chloroform damages the kidneys, liver and central nervous system. In animals, chloroform causes infertility, birth defects and cancer.
508
Samples
0
Samples exceeding legal limit (MCL)
439
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 5.30 ppb | 85 | 72 | ND - 11.6 ppb |
| 2015 | 4.80 ppb | 85 | 72 | ND - 9.88 ppb |
| 2016 | 7.13 ppb | 86 | 73 | ND - 17.5 ppb |
| 2017 | 4.79 ppb | 84 | 74 | ND - 12.9 ppb |
| 2018 | 4.63 ppb | 85 | 75 | ND - 11.1 ppb |
| 2019 | 6.62 ppb | 83 | 73 | ND - 14.4 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.4 ppb
The EWG Health Guideline of 0.4 ppb for chloroform 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 | Lab ID | Result |
|---|---|---|
| 2014-03-04 | 1610-027-0943 | 7.83 ppb |
| 2014-03-04 | 1610-032-0900 | 7.76 ppb |
| 2014-03-04 | 1610-033-0910 | 6.19 ppb |
| 2014-03-04 | 1610-039-0710 | 5.75 ppb |
| 2014-03-04 | 1610-040-1010 | 7.27 ppb |
| 2014-03-04 | 1610-041-1020 | 5.51 ppb |
| 2014-03-04 | 1610-042-1030 | 5.82 ppb |
| 2014-03-04 | 1610-043-1040 | 5.70 ppb |
| 2014-03-04 | 1610-044-0815 | 8.50 ppb |
| 2014-03-04 | 1610-045-0800 | 7.88 ppb |
| 2014-03-05 | 1610-029-0840 | 9.91 ppb |
| 2014-03-05 | 1610-030-0850 | 10.0 ppb |
| 2014-03-05 | 1610-031-0905 | 10.5 ppb |
| 2014-03-05 | 1610-034-0745 | 11.6 ppb |
| 2014-03-05 | 1610-035-0735 | 11.2 ppb |
| 2014-03-05 | 1610-037-0940 | 10.7 ppb |
| 2014-03-05 | 1610-049-1055 | 11.2 ppb |
| 2014-03-05 | 1610-053-1045 | 11.6 ppb |
| 2014-06-09 | 1610-027-0645 | 5.75 ppb |
| 2014-06-09 | 1610-032-0755 | 5.75 ppb |
| 2014-06-09 | 1610-033-0805 | 4.35 ppb |
| 2014-06-09 | 1610-039-0710 | 4.37 ppb |
| 2014-06-09 | 1610-040-1010 | 7.50 ppb |
| 2014-06-09 | 1610-041-1020 | 5.77 ppb |
| 2014-06-09 | 1610-042-1030 | 5.64 ppb |
| 2014-06-09 | 1610-043-1050 | 5.50 ppb |
| 2014-06-09 | 1610-044-0900 | 5.37 ppb |
| 2014-06-09 | 1610-045-0850 | 5.98 ppb |
| 2014-06-10 | 1610-029-0805 | 1.37 ppb |
| 2014-06-10 | 1610-030-0820 | 1.76 ppb |
| 2014-06-10 | 1610-031-0830 | 2.79 ppb |
| 2014-06-10 | 1610-034-0710 | 1.99 ppb |
| 2014-06-10 | 1610-035-0700 | 2.98 ppb |
| 2014-06-10 | 1610-037-0910 | 5.09 ppb |
| 2014-06-10 | 1610-049-1020 | 4.47 ppb |
| 2014-06-10 | 1610-053-1030 | 4.82 ppb |
| 2014-08-19 | 1610-001-0740 | ND |
| 2014-08-19 | 1610-003-0915 | ND |
| 2014-08-19 | 1610-008-0630 | ND |
| 2014-08-19 | 1610-012-0825 | ND |
| 2014-08-19 | 1610-015-1000 | ND |
| 2014-08-19 | 1610-018-0430 | ND |
| 2014-08-20 | 1610-002-0720 | ND |
| 2014-08-20 | 1610-007-0640 | ND |
| 2014-08-20 | 1610-017-1045 | ND |
| 2014-08-20 | 1610-019-0440 | ND |
| 2014-08-20 | 1610-020-0950 | ND |
| 2014-08-20 | 1610-050-0825 | ND |
| 2014-08-27 | 1610-006-0750 | ND |
| 2014-09-22 | 1610-027-0720 | 7.42 ppb |
| 2014-09-22 | 1610-032-0835 | 8.33 ppb |
| 2014-09-22 | 1610-033-0850 | 5.98 ppb |
| 2014-09-22 | 1610-039-0755 | 4.75 ppb |
| 2014-09-22 | 1610-040-1115 | 8.21 ppb |
| 2014-09-22 | 1610-041-1105 | 7.19 ppb |
| 2014-09-22 | 1610-042-1125 | 7.08 ppb |
| 2014-09-22 | 1610-043-1145 | 6.57 ppb |
| 2014-09-22 | 1610-044-1000 | 7.98 ppb |
| 2014-09-22 | 1610-045-0945 | 9.21 ppb |
| 2014-09-23 | 1610-029-0840 | 2.10 ppb |
| 2014-09-23 | 1610-030-0850 | 2.44 ppb |
| 2014-09-23 | 1610-031-0900 | 3.24 ppb |
| 2014-09-23 | 1610-034-0735 | 3.23 ppb |
| 2014-09-23 | 1610-035-0725 | 4.86 ppb |
| 2014-09-23 | 1610-037-0945 | 4.95 ppb |
| 2014-09-23 | 1610-049-1100 | 5.08 ppb |
| 2014-09-23 | 1610-053-1045 | 5.86 ppb |
| 2014-12-08 | 1610-027-0710 | 5.38 ppb |
| 2014-12-08 | 1610-032-0825 | 5.87 ppb |
| 2014-12-08 | 1610-033-0845 | 5.53 ppb |
| 2014-12-08 | 1610-039-0745 | 5.97 ppb |
| 2014-12-08 | 1610-040-1045 | 5.88 ppb |
| 2014-12-08 | 1610-041-1105 | 5.78 ppb |
| 2014-12-08 | 1610-042-1120 | 6.05 ppb |
| 2014-12-08 | 1610-043-1145 | 5.17 ppb |
| 2014-12-08 | 1610-044-0945 | 5.38 ppb |
| 2014-12-08 | 1610-045-0930 | 6.20 ppb |
| 2014-12-09 | 1610-029-0820 | 5.69 ppb |
| 2014-12-09 | 1610-030-0835 | 5.28 ppb |
| 2014-12-09 | 1610-031-0850 | 5.87 ppb |
| 2014-12-09 | 1610-034-0715 | 6.16 ppb |
| 2014-12-09 | 1610-035-0730 | 7.23 ppb |
| 2014-12-09 | 1610-037-0930 | 6.80 ppb |
| 2014-12-09 | 1610-049-1025 | 7.81 ppb |
| 2014-12-09 | 1610-053-1040 | 7.30 ppb |
| 2015-03-02 | 1610-027-0700 | 7.25 ppb |
| 2015-03-02 | 1610-032-0815 | 7.63 ppb |
| 2015-03-02 | 1610-033-0825 | 6.02 ppb |
| 2015-03-02 | 1610-039-0735 | 4.96 ppb |
| 2015-03-02 | 1610-040-1045 | 7.87 ppb |
| 2015-03-02 | 1610-041-1030 | 6.47 ppb |
| 2015-03-02 | 1610-042-1055 | 6.55 ppb |
| 2015-03-02 | 1610-043-1110 | 6.34 ppb |
| 2015-03-02 | 1610-044-0920 | 7.17 ppb |
| 2015-03-02 | 1610-045-0935 | 8.19 ppb |
| 2015-03-04 | 1610-029-0815 | 3.71 ppb |
| 2015-03-04 | 1610-030-0825 | 5.19 ppb |
| 2015-03-04 | 1610-031-0840 | 7.50 ppb |
| 2015-03-04 | 1610-034-0725 | 7.59 ppb |
| 2015-03-04 | 1610-035-0715 | 8.77 ppb |
| 2015-03-04 | 1610-037-0920 | 9.65 ppb |
| 2015-03-04 | 1610-049-1010 | 8.80 ppb |
| 2015-03-04 | 1610-053-1025 | 9.88 ppb |
| 2015-06-01 | 1610-027-0710 | 6.97 ppb |
| 2015-06-01 | 1610-032-0825 | 7.67 ppb |
| 2015-06-01 | 1610-033-0835 | 5.08 ppb |
| 2015-06-01 | 1610-039-0745 | 3.15 ppb |
| 2015-06-01 | 1610-040-1055 | 8.30 ppb |
| 2015-06-01 | 1610-041-1045 | 5.47 ppb |
| 2015-06-01 | 1610-042-1105 | 6.73 ppb |
| 2015-06-01 | 1610-043-1120 | 6.21 ppb |
| 2015-06-01 | 1610-044-0940 | 5.71 ppb |
| 2015-06-01 | 1610-045-0930 | 7.40 ppb |
| 2015-06-02 | 1610-029-0830 | 1.99 ppb |
| 2015-06-02 | 1610-030-0845 | 2.47 ppb |
| 2015-06-02 | 1610-031-0900 | 3.04 ppb |
| 2015-06-02 | 1610-034-0725 | 3.92 ppb |
| 2015-06-02 | 1610-035-0715 | 4.11 ppb |
| 2015-06-02 | 1610-037-0940 | 4.40 ppb |
| 2015-06-02 | 1610-049-1045 | 4.07 ppb |
| 2015-06-02 | 1610-053-1030 | 4.09 ppb |
| 2015-08-11 | 1610-001-0745 | ND |
| 2015-08-11 | 1610-003-1130 | ND |
| 2015-08-11 | 1610-008-0700 | ND |
| 2015-08-11 | 1610-012-0900 | ND |
| 2015-08-11 | 1610-015-0945 | ND |
| 2015-08-11 | 1610-017-0415 | ND |
| 2015-08-11 | 1610-018-0500 | ND |
| 2015-08-12 | 1610-002-0730 | ND |
| 2015-08-12 | 1610-006-1145 | ND |
| 2015-08-12 | 1610-007-0640 | ND |
| 2015-08-12 | 1610-019-1005 | ND |
| 2015-08-12 | 1610-020-1100 | ND |
| 2015-08-12 | 1610-050-0830 | ND |
| 2015-09-08 | 1610-027-0700 | 7.37 ppb |
| 2015-09-08 | 1610-032-0815 | 7.93 ppb |
| 2015-09-08 | 1610-033-0830 | 4.57 ppb |
| 2015-09-08 | 1610-039-0730 | 2.95 ppb |
| 2015-09-08 | 1610-040-1045 | 7.86 ppb |
| 2015-09-08 | 1610-041-1030 | 5.01 ppb |
| 2015-09-08 | 1610-042-1100 | 6.10 ppb |
| 2015-09-08 | 1610-043-1115 | 4.91 ppb |
| 2015-09-08 | 1610-044-0930 | 7.93 ppb |
| 2015-09-08 | 1610-045-0915 | 8.72 ppb |
| 2015-09-09 | 1610-029-0820 | 2.35 ppb |
| 2015-09-09 | 1610-030-0900 | 2.92 ppb |
| 2015-09-09 | 1610-031-0840 | 3.64 ppb |
| 2015-09-09 | 1610-034-0730 | 1.23 ppb |
| 2015-09-09 | 1610-035-0715 | 2.32 ppb |
| 2015-09-09 | 1610-049-0945 | 5.10 ppb |
| 2015-09-09 | 1610-049-1055 | 4.38 ppb |
| 2015-09-09 | 1610-053-1040 | 4.97 ppb |
| 2015-12-17 | 1610-027-1440 | 6.44 ppb |
| 2015-12-17 | 1610-029-0940 | 4.13 ppb |
| 2015-12-17 | 1610-030-0950 | 4.73 ppb |
| 2015-12-17 | 1610-031-1000 | 5.35 ppb |
| 2015-12-17 | 1610-032-1340 | 4.69 ppb |
| 2015-12-17 | 1610-033-1350 | 6.40 ppb |
| 2015-12-17 | 1610-034-0850 | 3.63 ppb |
| 2015-12-17 | 1610-035-0900 | 4.73 ppb |
| 2015-12-17 | 1610-037-1220 | 5.82 ppb |
| 2015-12-17 | 1610-039-1415 | 3.68 ppb |
| 2015-12-17 | 1610-040-1500 | 6.74 ppb |
| 2015-12-17 | 1610-041-1510 | 5.05 ppb |
| 2015-12-17 | 1610-042-1515 | 5.15 ppb |
| 2015-12-17 | 1610-043-1530 | 4.93 ppb |
| 2015-12-17 | 1610-044-1300 | 6.58 ppb |
| 2015-12-17 | 1610-045-1310 | 6.51 ppb |
| 2015-12-17 | 1610-049-1040 | 6.39 ppb |
| 2015-12-17 | 1610-053-1050 | 6.59 ppb |
| 2016-03-08 | 1610-027-1300 | 14.4 ppb |
| 2016-03-08 | 1610-032-1130 | 10.0 ppb |
| 2016-03-08 | 1610-033-1140 | 15.3 ppb |
| 2016-03-08 | 1610-039-1220 | 10.4 ppb |
| 2016-03-08 | 1610-040-1400 | 17.5 ppb |
| 2016-03-08 | 1610-041-1410 | 12.1 ppb |
| 2016-03-08 | 1610-042-1420 | 12.0 ppb |
| 2016-03-08 | 1610-043-1430 | 11.7 ppb |
| 2016-03-08 | 1610-044-1030 | 14.3 ppb |
| 2016-03-08 | 1610-045-1040 | 16.5 ppb |
| 2016-03-09 | 1610-029-1015 | 7.59 ppb |
| 2016-03-09 | 1610-030-1025 | 8.46 ppb |
| 2016-03-09 | 1610-031-1035 | 9.43 ppb |
| 2016-03-09 | 1610-034-1400 | 8.42 ppb |
| 2016-03-09 | 1610-035-1410 | 11.1 ppb |
| 2016-03-09 | 1610-037-1200 | 10.5 ppb |
| 2016-03-09 | 1610-049-1210 | 7.97 ppb |
| 2016-03-09 | 1610-053-0940 | 8.43 ppb |
| 2016-06-08 | 1610-027-1200 | 5.87 ppb |
| 2016-06-08 | 1610-032-1300 | 7.47 ppb |
| 2016-06-08 | 1610-033-1310 | 4.53 ppb |
| 2016-06-08 | 1610-039-1215 | 3.89 ppb |
| 2016-06-08 | 1610-040-1100 | 10.6 ppb |
| 2016-06-08 | 1610-041-1110 | 6.25 ppb |
| 2016-06-08 | 1610-042-1115 | 7.46 ppb |
| 2016-06-08 | 1610-043-1125 | 6.58 ppb |
| 2016-06-08 | 1610-044-1400 | 6.22 ppb |
| 2016-06-08 | 1610-045-1410 | 7.11 ppb |
| 2016-06-27 | 1610-029-1000 | 2.08 ppb |
| 2016-06-27 | 1610-030-1010 | 2.59 ppb |
| 2016-06-27 | 1610-031-1020 | 4.03 ppb |
| 2016-06-27 | 1610-034-0840 | 6.38 ppb |
| 2016-06-27 | 1610-035-0850 | 3.39 ppb |
| 2016-06-27 | 1610-037-1100 | 6.57 ppb |
| 2016-06-27 | 1610-049-1200 | 3.48 ppb |
| 2016-06-27 | 1610-053-1210 | 3.92 ppb |
| 2016-08-30 | 1610-001-1340 | ND |
| 2016-08-30 | 1610-002-0800 | ND |
| 2016-08-30 | 1610-003-0920 | ND |
| 2016-08-30 | 1610-012-0838 | ND |
| 2016-08-30 | 1610-015-0950 | 7.99 ppb |
| 2016-08-30 | 1610-017-1030 | ND |
| 2016-08-30 | 1610-018-0850 | ND |
| 2016-08-31 | 1610-006-0600 | ND |
| 2016-08-31 | 1610-007-0930 | ND |
| 2016-08-31 | 1610-008-1045 | ND |
| 2016-08-31 | 1610-020-0515 | ND |
| 2016-08-31 | 1610-050-0800 | ND |
| 2016-09-27 | 1610-029-1010 | 2.98 ppb |
| 2016-09-27 | 1610-030-1020 | 3.96 ppb |
| 2016-09-27 | 1610-031-1030 | 4.28 ppb |
| 2016-09-27 | 1610-034-0910 | 2.88 ppb |
| 2016-09-27 | 1610-035-0920 | 4.89 ppb |
| 2016-09-27 | 1610-037-1100 | 6.37 ppb |
| 2016-09-27 | 1610-049-1220 | 5.23 ppb |
| 2016-09-27 | 1610-053-1230 | 7.24 ppb |
| 2016-09-28 | 1610-027-1020 | 5.72 ppb |
| 2016-09-28 | 1610-032-1120 | 7.97 ppb |
| 2016-09-28 | 1610-033-1130 | 6.06 ppb |
| 2016-09-28 | 1610-039-1045 | 4.15 ppb |
| 2016-09-28 | 1610-040-0910 | 9.08 ppb |
| 2016-09-28 | 1610-041-0920 | 6.72 ppb |
| 2016-09-28 | 1610-042-0930 | 6.18 ppb |
| 2016-09-28 | 1610-043-0940 | 7.52 ppb |
| 2016-09-28 | 1610-044-1215 | 8.00 ppb |
| 2016-09-28 | 1610-045-1225 | 9.50 ppb |
| 2016-10-12 | 1610-019-0900 | ND |
| 2016-11-09 | 1610-015-0810 | ND |
| 2016-12-14 | 1610-029-1000 | 7.55 ppb |
| 2016-12-14 | 1610-030-1010 | 8.40 ppb |
| 2016-12-14 | 1610-031-1020 | 10.6 ppb |
| 2016-12-14 | 1610-034-0900 | 8.04 ppb |
| 2016-12-14 | 1610-035-0910 | 9.98 ppb |
| 2016-12-14 | 1610-037-1120 | 11.4 ppb |
| 2016-12-14 | 1610-049-1200 | 11.6 ppb |
| 2016-12-14 | 1610-053-1210 | 11.4 ppb |
| 2016-12-20 | 1610-027-1150 | 10.0 ppb |
| 2016-12-20 | 1610-032-1020 | 11.8 ppb |
| 2016-12-20 | 1610-033-1030 | 12.3 ppb |
| 2016-12-20 | 1610-039-1120 | 11.6 ppb |
| 2016-12-20 | 1610-040-1235 | 12.0 ppb |
| 2016-12-20 | 1610-041-1240 | 11.2 ppb |
| 2016-12-20 | 1610-042-1245 | 10.5 ppb |
| 2016-12-20 | 1610-043-1300 | 11.0 ppb |
| 2016-12-20 | 1610-044-0930 | 11.8 ppb |
| 2016-12-20 | 1610-045-0940 | 11.1 ppb |
| 2017-03-14 | 1610-029-1000 | 4.29 ppb |
| 2017-03-14 | 1610-030-1010 | 4.16 ppb |
| 2017-03-14 | 1610-031-1020 | 6.66 ppb |
| 2017-03-14 | 1610-034-0910 | 6.56 ppb |
| 2017-03-14 | 1610-035-0920 | 7.96 ppb |
| 2017-03-14 | 1610-037-1115 | 7.99 ppb |
| 2017-03-14 | 1610-049-1210 | 7.78 ppb |
| 2017-03-14 | 1610-053-1220 | 8.63 ppb |
| 2017-03-16 | 1610-027-1130 | 8.68 ppb |
| 2017-03-16 | 1610-032-1040 | 8.56 ppb |
| 2017-03-16 | 1610-033-1050 | 9.36 ppb |
| 2017-03-16 | 1610-039-1115 | 6.32 ppb |
| 2017-03-16 | 1610-040-1150 | 10.2 ppb |
| 2017-03-16 | 1610-041-1200 | 9.31 ppb |
| 2017-03-16 | 1610-042-1210 | 9.43 ppb |
| 2017-03-16 | 1610-043-1220 | 7.26 ppb |
| 2017-03-16 | 1610-044-0940 | 10.9 ppb |
| 2017-03-16 | 1610-045-0950 | 12.9 ppb |
| 2017-06-06 | 1610-027-1200 | 4.61 ppb |
| 2017-06-06 | 1610-032-1100 | 5.51 ppb |
| 2017-06-06 | 1610-033-1110 | 3.70 ppb |
| 2017-06-06 | 1610-039-1140 | 3.22 ppb |
| 2017-06-06 | 1610-040-1230 | 6.37 ppb |
| 2017-06-06 | 1610-041-1240 | 4.33 ppb |
| 2017-06-06 | 1610-042-1250 | 4.27 ppb |
| 2017-06-06 | 1610-043-1300 | 4.19 ppb |
| 2017-06-06 | 1610-044-1010 | 5.17 ppb |
| 2017-06-06 | 1610-045-1020 | 6.05 ppb |
| 2017-06-07 | 1610-029-1020 | 3.45 ppb |
| 2017-06-07 | 1610-030-1030 | 1.74 ppb |
| 2017-06-07 | 1610-031-1040 | 2.52 ppb |
| 2017-06-07 | 1610-034-0850 | 2.65 ppb |
| 2017-06-07 | 1610-035-0900 | 1.39 ppb |
| 2017-06-07 | 1610-037-1125 | 5.83 ppb |
| 2017-06-07 | 1610-049-1155 | 4.33 ppb |
| 2017-06-07 | 1610-053-1200 | 5.69 ppb |
| 2017-08-28 | 1610-001-0815 | ND |
| 2017-08-28 | 1610-002-0950 | ND |
| 2017-08-28 | 1610-003-0730 | ND |
| 2017-08-28 | 1610-015-0845 | ND |
| 2017-08-28 | 1610-017-0920 | ND |
| 2017-08-29 | 1610-006-0610 | 1.27 ppb |
| 2017-08-29 | 1610-007-1030 | ND |
| 2017-08-29 | 1610-008-0930 | ND |
| 2017-08-29 | 1610-019-1145 | ND |
| 2017-08-29 | 1610-020-0515 | ND |
| 2017-08-29 | 1610-050-0745 | ND |
| 2017-09-13 | 1610-029-1030 | 2.18 ppb |
| 2017-09-13 | 1610-030-1040 | 2.86 ppb |
| 2017-09-13 | 1610-031-1050 | 3.66 ppb |
| 2017-09-13 | 1610-034-0930 | 2.45 ppb |
| 2017-09-13 | 1610-035-0940 | 3.27 ppb |
| 2017-09-13 | 1610-037-1130 | 3.86 ppb |
| 2017-09-13 | 1610-049-1210 | 5.04 ppb |
| 2017-09-13 | 1610-053-1220 | 6.11 ppb |
| 2017-09-25 | 1610-027-1225 | 5.16 ppb |
| 2017-09-25 | 1610-032-1145 | 6.56 ppb |
| 2017-09-25 | 1610-033-1155 | 3.85 ppb |
| 2017-09-25 | 1610-039-1215 | 4.99 ppb |
| 2017-09-25 | 1610-040-1250 | 9.00 ppb |
| 2017-09-25 | 1610-041-1255 | 6.53 ppb |
| 2017-09-25 | 1610-042-1300 | 6.47 ppb |
| 2017-09-25 | 1610-043-1310 | 6.60 ppb |
| 2017-09-25 | 1610-044-1100 | 6.31 ppb |
| 2017-09-25 | 1610-045-1110 | 7.85 ppb |
| 2017-09-28 | 1610-006-0840 | 6.02 ppb |
| 2017-11-28 | 1610-029-1015 | 2.02 ppb |
| 2017-11-28 | 1610-030-1025 | 2.51 ppb |
| 2017-11-28 | 1610-031-1035 | 3.74 ppb |
| 2017-11-28 | 1610-034-0910 | 2.12 ppb |
| 2017-11-28 | 1610-035-0920 | 3.29 ppb |
| 2017-11-28 | 1610-037-1110 | 3.25 ppb |
| 2017-11-28 | 1610-049-1200 | 4.25 ppb |
| 2017-11-28 | 1610-053-1210 | 4.45 ppb |
| 2017-11-29 | 1610-027-1205 | 5.02 ppb |
| 2017-11-29 | 1610-032-1020 | 5.06 ppb |
| 2017-11-29 | 1610-033-1030 | 6.55 ppb |
| 2017-11-29 | 1610-039-1130 | 5.40 ppb |
| 2017-11-29 | 1610-040-1230 | 4.40 ppb |
| 2017-11-29 | 1610-041-1240 | 7.26 ppb |
| 2017-11-29 | 1610-042-1245 | 4.58 ppb |
| 2017-11-29 | 1610-043-1250 | 4.16 ppb |
| 2017-11-29 | 1610-044-0940 | 5.87 ppb |
| 2017-11-29 | 1610-045-0950 | 6.59 ppb |
| 2018-03-06 | 1610-029-1010 | 1.37 ppb |
| 2018-03-06 | 1610-030-1020 | 1.70 ppb |
| 2018-03-06 | 1610-031-1030 | 2.66 ppb |
| 2018-03-06 | 1610-034-0920 | 4.06 ppb |
| 2018-03-06 | 1610-035-0930 | 4.88 ppb |
| 2018-03-06 | 1610-037-1100 | 4.36 ppb |
| 2018-03-06 | 1610-049-1210 | 3.35 ppb |
| 2018-03-06 | 1610-053-1220 | 3.83 ppb |
| 2018-03-28 | 1610-027-1200 | 6.92 ppb |
| 2018-03-28 | 1610-032-1100 | 8.82 ppb |
| 2018-03-28 | 1610-033-1110 | 6.90 ppb |
| 2018-03-28 | 1610-039-1140 | 5.67 ppb |
| 2018-03-28 | 1610-040-1215 | 9.16 ppb |
| 2018-03-28 | 1610-041-1220 | 6.74 ppb |
| 2018-03-28 | 1610-042-1230 | 7.04 ppb |
| 2018-03-28 | 1610-043-1240 | 7.36 ppb |
| 2018-03-28 | 1610-044-1010 | 9.60 ppb |
| 2018-03-28 | 1610-045-1020 | 9.46 ppb |
| 2018-06-14 | 1610-029-0950 | 1.59 ppb |
| 2018-06-14 | 1610-030-1000 | 1.97 ppb |
| 2018-06-14 | 1610-031-1010 | 3.07 ppb |
| 2018-06-14 | 1610-034-0835 | 1.94 ppb |
| 2018-06-14 | 1610-035-0840 | 2.72 ppb |
| 2018-06-14 | 1610-037-1050 | 4.11 ppb |
| 2018-06-14 | 1610-049-1200 | 4.79 ppb |
| 2018-06-14 | 1610-053-1210 | 5.00 ppb |
| 2018-06-19 | 1610-027-1150 | 5.46 ppb |
| 2018-06-19 | 1610-032-1040 | 4.21 ppb |
| 2018-06-19 | 1610-033-1050 | 4.22 ppb |
| 2018-06-19 | 1610-039-1130 | 2.92 ppb |
| 2018-06-19 | 1610-040-1215 | 8.23 ppb |
| 2018-06-19 | 1610-041-1220 | 4.10 ppb |
| 2018-06-19 | 1610-042-1230 | 5.95 ppb |
| 2018-06-19 | 1610-043-1240 | 5.90 ppb |
| 2018-06-19 | 1610-044-1000 | 5.93 ppb |
| 2018-06-19 | 1610-045-1010 | 6.44 ppb |
| 2018-08-27 | 1610-007-1110 | ND |
| 2018-08-27 | 1610-008-1130 | ND |
| 2018-08-27 | 1610-050-0930 | ND |
| 2018-09-04 | 1610-002-1230 | ND |
| 2018-09-04 | 1610-003-0950 | ND |
| 2018-09-04 | 1610-006-0830 | 4.43 ppb |
| 2018-09-04 | 1610-015-0900 | 5.93 ppb |
| 2018-09-04 | 1610-017-0935 | ND |
| 2018-09-04 | 1610-020-0915 | ND |
| 2018-09-10 | 1610-019-0910 | ND |
| 2018-09-11 | 1610-001-1115 | 2.81 ppb |
| 2018-09-19 | 1610-029-1030 | 2.32 ppb |
| 2018-09-19 | 1610-030-1040 | 2.60 ppb |
| 2018-09-19 | 1610-031-1050 | 3.96 ppb |
| 2018-09-19 | 1610-034-0945 | 1.79 ppb |
| 2018-09-19 | 1610-035-0955 | 2.92 ppb |
| 2018-09-19 | 1610-037-1120 | 5.35 ppb |
| 2018-09-19 | 1610-049-1255 | 5.60 ppb |
| 2018-09-19 | 1610-053-1310 | 6.12 ppb |
| 2018-09-25 | 1610-027-1310 | 5.39 ppb |
| 2018-09-25 | 1610-032-1115 | 8.50 ppb |
| 2018-09-25 | 1610-033-1125 | 4.71 ppb |
| 2018-09-25 | 1610-039-1210 | 4.22 ppb |
| 2018-09-25 | 1610-040-1320 | 6.18 ppb |
| 2018-09-25 | 1610-041-1330 | 11.1 ppb |
| 2018-09-25 | 1610-042-1335 | 7.01 ppb |
| 2018-09-25 | 1610-043-1340 | 6.24 ppb |
| 2018-09-25 | 1610-044-1030 | 5.83 ppb |
| 2018-09-25 | 1610-045-1040 | 8.40 ppb |
| 2018-10-16 | 1610-001-0930 | ND |
| 2018-12-06 | 1610-015-0800 | 2.06 ppb |
| 2018-12-18 | 1610-029-1010 | 3.82 ppb |
| 2018-12-18 | 1610-031-1030 | 5.54 ppb |
| 2018-12-18 | 1610-034-0905 | 7.04 ppb |
| 2018-12-18 | 1610-035-0910 | 9.01 ppb |
| 2018-12-18 | 1610-037-1100 | 7.20 ppb |
| 2018-12-18 | 1610-049-1150 | 4.34 ppb |
| 2018-12-18 | 1610-053-1200 | 8.62 ppb |
| 2018-12-19 | 1610-027-1010 | 4.58 ppb |
| 2018-12-19 | 1610-032-1130 | 5.81 ppb |
| 2018-12-19 | 1610-033-1120 | 4.86 ppb |
| 2018-12-19 | 1610-039-1045 | 4.27 ppb |
| 2018-12-19 | 1610-040-0910 | 6.57 ppb |
| 2018-12-19 | 1610-041-0920 | 4.10 ppb |
| 2018-12-19 | 1610-042-0930 | 5.19 ppb |
| 2018-12-19 | 1610-043-0940 | 4.51 ppb |
| 2018-12-19 | 1610-044-1230 | 6.18 ppb |
| 2018-12-19 | 1610-045-1240 | 6.00 ppb |
| 2018-12-27 | 1610-030-0815 | ND |
| 2019-03-12 | 1610-029-1045 | 7.51 ppb |
| 2019-03-12 | 1610-030-1055 | 8.47 ppb |
| 2019-03-12 | 1610-031-1100 | 11.1 ppb |
| 2019-03-12 | 1610-034-0945 | 11.1 ppb |
| 2019-03-12 | 1610-035-1000 | 12.7 ppb |
| 2019-03-12 | 1610-037-1200 | 9.21 ppb |
| 2019-03-12 | 1610-049-1300 | 9.66 ppb |
| 2019-03-12 | 1610-053-1310 | 10.9 ppb |
| 2019-03-13 | 1610-027-1230 | 13.6 ppb |
| 2019-03-13 | 1610-032-1120 | 12.6 ppb |
| 2019-03-13 | 1610-033-1130 | 11.7 ppb |
| 2019-03-13 | 1610-039-1215 | 12.9 ppb |
| 2019-03-13 | 1610-043-1400 | 9.01 ppb |
| 2019-03-13 | 1610-044-1010 | 14.4 ppb |
| 2019-03-13 | 1610-045-1020 | 13.6 ppb |
| 2019-03-29 | 1610-040-1010 | 4.56 ppb |
| 2019-03-29 | 1610-041-1000 | 4.59 ppb |
| 2019-03-29 | 1610-042-1020 | 4.52 ppb |
| 2019-06-19 | 1610-029-1040 | 2.77 ppb |
| 2019-06-19 | 1610-030-1050 | 3.46 ppb |
| 2019-06-19 | 1610-031-1100 | 4.60 ppb |
| 2019-06-19 | 1610-034-0920 | 4.26 ppb |
| 2019-06-19 | 1610-035-0930 | 4.62 ppb |
| 2019-06-19 | 1610-037-1150 | 5.96 ppb |
| 2019-06-19 | 1610-049-1230 | 5.42 ppb |
| 2019-06-19 | 1610-053-1240 | 6.89 ppb |
| 2019-06-25 | 1610-027-1115 | 7.93 ppb |
| 2019-06-25 | 1610-032-1030 | 9.91 ppb |
| 2019-06-25 | 1610-033-1040 | 6.54 ppb |
| 2019-06-25 | 1610-039-1100 | 5.20 ppb |
| 2019-06-25 | 1610-040-1215 | 7.46 ppb |
| 2019-06-25 | 1610-041-1220 | 9.26 ppb |
| 2019-06-25 | 1610-042-1230 | 12.4 ppb |
| 2019-06-25 | 1610-043-1240 | 9.49 ppb |
| 2019-06-25 | 1610-044-0945 | 9.20 ppb |
| 2019-06-25 | 1610-045-0950 | 9.71 ppb |
| 2019-09-09 | 1610-006-0810 | 5.11 ppb |
| 2019-09-09 | 1610-007-1100 | ND |
| 2019-09-09 | 1610-008-0930 | ND |
| 2019-09-09 | 1610-020-0850 | ND |
| 2019-09-09 | 1610-050-0730 | ND |
| 2019-09-10 | 1610-001-1040 | ND |
| 2019-09-10 | 1610-002-0810 | ND |
| 2019-09-10 | 1610-003-0700 | ND |
| 2019-09-10 | 1610-015-0720 | ND |
| 2019-09-10 | 1610-017-0740 | ND |
| 2019-09-17 | 1610-029-1020 | 2.83 ppb |
| 2019-09-17 | 1610-030-1030 | 3.54 ppb |
| 2019-09-17 | 1610-031-1040 | 3.92 ppb |
| 2019-09-17 | 1610-034-0905 | 3.21 ppb |
| 2019-09-17 | 1610-035-0915 | 4.18 ppb |
| 2019-09-17 | 1610-037-1110 | 5.17 ppb |
| 2019-09-17 | 1610-049-1210 | 5.61 ppb |
| 2019-09-17 | 1610-053-1215 | 6.42 ppb |
| 2019-09-24 | 1610-027-1115 | 4.97 ppb |
| 2019-09-24 | 1610-032-1040 | 7.77 ppb |
| 2019-09-24 | 1610-033-1045 | 3.52 ppb |
| 2019-09-24 | 1610-039-1100 | 2.10 ppb |
| 2019-09-24 | 1610-040-1150 | 4.35 ppb |
| 2019-09-24 | 1610-041-1155 | 7.12 ppb |
| 2019-09-24 | 1610-042-1200 | 6.86 ppb |
| 2019-09-24 | 1610-043-1230 | 6.95 ppb |
| 2019-09-24 | 1610-044-1000 | 5.98 ppb |
| 2019-09-24 | 1610-045-1010 | 6.52 ppb |
| 2019-11-21 | 1610-034-0930 | 3.18 ppb |
| 2019-11-21 | 1610-035-0940 | 3.89 ppb |
| 2019-12-11 | 1610-019-0945 | ND |
| 2019-12-18 | 1610-027-1245 | 6.57 ppb |
| 2019-12-18 | 1610-029-0905 | 5.96 ppb |
| 2019-12-18 | 1610-030-0910 | 6.97 ppb |
| 2019-12-18 | 1610-031-0915 | 8.59 ppb |
| 2019-12-18 | 1610-032-1215 | 7.31 ppb |
| 2019-12-18 | 1610-033-1220 | 10.3 ppb |
| 2019-12-18 | 1610-037-1020 | 11.0 ppb |
| 2019-12-18 | 1610-039-1235 | 8.84 ppb |
| 2019-12-18 | 1610-040-1305 | 8.87 ppb |
| 2019-12-18 | 1610-041-1310 | 8.75 ppb |
| 2019-12-18 | 1610-043-1315 | 9.58 ppb |
| 2019-12-18 | 1610-043-1320 | 9.14 ppb |
| 2019-12-18 | 1610-044-1135 | 9.71 ppb |
| 2019-12-18 | 1610-045-1140 | 8.25 ppb |
| 2019-12-18 | 1610-049-1040 | 8.88 ppb |
| 2019-12-18 | 1610-053-1045 | 10.2 ppb |