Total trihalomethanes (TTHMs)
Sonoma County Water Agency
Trihalomethanes are cancer-causing contaminants that form during water treatment with chlorine and other disinfectants. The total trihalomethanes group includes four chemicals: chloroform, bromodichloromethane, dibromochloromethane and bromoform. Read More.
Studies conducted in the U.S. and Europe have found that drinking tap water that carries disinfection byproducts increases the risk of developing bladder cancer. In animal studies, all trihalomethanes cause liver, kidney and intestinal tumors. Some human epidemiological studies also reported an association between disinfection byproducts and an increased risk of problems during pregnancy, including spontaneous miscarriage, cardiovascular defects, neural tube defects and low birth weight.
The health guideline of 0.15 parts per billion, or ppb, for the group of four trihalomethanes, or THM4/TTHM, was defined in a peer-reviewed scientific study by EWG and represents a one-in-one-million lifetime cancer risk level.
458
Samples
0
Samples exceeding legal limit (MCL)
431
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 14.0 ppb | 85 | 72 | ND - 22.0 ppb |
| 2015 | 11.9 ppb | 85 | 72 | ND - 19.8 ppb |
| 2016 | 16.3 ppb | 72 | 72 | 9.54 ppb - 27.5 ppb |
| 2017 | 10.4 ppb | 72 | 72 | 5.64 ppb - 17.2 ppb |
| 2018 | 12.2 ppb | 72 | 71 | ND - 21.1 ppb |
| 2019 | 14.9 ppb | 72 | 72 | 6.87 ppb - 24.1 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.15 ppb
The health guideline of 0.15 parts per billion, or ppb, for the group of four trihalomethanes, or THM4/TTHM, was defined in a peer-reviewed scientific study by EWG and represents a one-in-one-million lifetime cancer risk level.
EPA Maximum Contaminant
Level (MCL) 80 ppb
The legal limit for the group of four trihalomethanes, established in 1998, was based on the need for residual disinfectant levels in water served to customers and the cost of treatment. This limit does not fully protect against the risk of cancer due to exposure to trihalomethanes.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-03-04 | 1610-027-0943 | 15.2 ppb |
| 2014-03-04 | 1610-032-0900 | 16.9 ppb |
| 2014-03-04 | 1610-033-0910 | 12.9 ppb |
| 2014-03-04 | 1610-039-0710 | 14.1 ppb |
| 2014-03-04 | 1610-040-1010 | 16.8 ppb |
| 2014-03-04 | 1610-041-1020 | 11.9 ppb |
| 2014-03-04 | 1610-042-1030 | 12.2 ppb |
| 2014-03-04 | 1610-043-1040 | 11.7 ppb |
| 2014-03-04 | 1610-044-0815 | 18.2 ppb |
| 2014-03-04 | 1610-045-0800 | 17.5 ppb |
| 2014-03-05 | 1610-029-0840 | 17.3 ppb |
| 2014-03-05 | 1610-030-0850 | 17.7 ppb |
| 2014-03-05 | 1610-031-0905 | 19.4 ppb |
| 2014-03-05 | 1610-034-0745 | 21.6 ppb |
| 2014-03-05 | 1610-035-0735 | 21.3 ppb |
| 2014-03-05 | 1610-037-0940 | 20.3 ppb |
| 2014-03-05 | 1610-049-1055 | 20.9 ppb |
| 2014-03-05 | 1610-053-1045 | 21.5 ppb |
| 2014-06-09 | 1610-027-0645 | 18.1 ppb |
| 2014-06-09 | 1610-032-0755 | 18.9 ppb |
| 2014-06-09 | 1610-033-0805 | 15.9 ppb |
| 2014-06-09 | 1610-039-0710 | 15.7 ppb |
| 2014-06-09 | 1610-040-1010 | 21.1 ppb |
| 2014-06-09 | 1610-041-1020 | 17.9 ppb |
| 2014-06-09 | 1610-042-1030 | 18.1 ppb |
| 2014-06-09 | 1610-043-1050 | 17.7 ppb |
| 2014-06-09 | 1610-044-0900 | 17.7 ppb |
| 2014-06-09 | 1610-045-0850 | 19.0 ppb |
| 2014-06-10 | 1610-029-0805 | 9.31 ppb |
| 2014-06-10 | 1610-030-0820 | 10.2 ppb |
| 2014-06-10 | 1610-031-0830 | 12.4 ppb |
| 2014-06-10 | 1610-034-0710 | 10.9 ppb |
| 2014-06-10 | 1610-035-0700 | 12.9 ppb |
| 2014-06-10 | 1610-037-0910 | 17.2 ppb |
| 2014-06-10 | 1610-049-1020 | 16.0 ppb |
| 2014-06-10 | 1610-053-1030 | 16.6 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 | 19.7 ppb |
| 2014-09-22 | 1610-032-0835 | 20.5 ppb |
| 2014-09-22 | 1610-033-0850 | 17.3 ppb |
| 2014-09-22 | 1610-039-0755 | 15.5 ppb |
| 2014-09-22 | 1610-040-1115 | 20.7 ppb |
| 2014-09-22 | 1610-041-1105 | 19.2 ppb |
| 2014-09-22 | 1610-042-1125 | 18.9 ppb |
| 2014-09-22 | 1610-043-1145 | 18.2 ppb |
| 2014-09-22 | 1610-044-1000 | 20.4 ppb |
| 2014-09-22 | 1610-045-0945 | 22.0 ppb |
| 2014-09-23 | 1610-029-0840 | 10.9 ppb |
| 2014-09-23 | 1610-030-0850 | 11.7 ppb |
| 2014-09-23 | 1610-031-0900 | 13.1 ppb |
| 2014-09-23 | 1610-034-0735 | 12.4 ppb |
| 2014-09-23 | 1610-035-0725 | 15.3 ppb |
| 2014-09-23 | 1610-037-0945 | 16.1 ppb |
| 2014-09-23 | 1610-049-1100 | 15.4 ppb |
| 2014-09-23 | 1610-053-1045 | 16.5 ppb |
| 2014-12-08 | 1610-027-0710 | 16.3 ppb |
| 2014-12-08 | 1610-032-0825 | 17.1 ppb |
| 2014-12-08 | 1610-033-0845 | 16.2 ppb |
| 2014-12-08 | 1610-039-0745 | 16.8 ppb |
| 2014-12-08 | 1610-040-1045 | 16.8 ppb |
| 2014-12-08 | 1610-041-1105 | 16.8 ppb |
| 2014-12-08 | 1610-042-1120 | 17.7 ppb |
| 2014-12-08 | 1610-043-1145 | 16.1 ppb |
| 2014-12-08 | 1610-044-0945 | 16.5 ppb |
| 2014-12-08 | 1610-045-0930 | 17.7 ppb |
| 2014-12-09 | 1610-029-0820 | 12.7 ppb |
| 2014-12-09 | 1610-030-0835 | 12.0 ppb |
| 2014-12-09 | 1610-031-0850 | 15.4 ppb |
| 2014-12-09 | 1610-034-0715 | 14.2 ppb |
| 2014-12-09 | 1610-035-0730 | 18.6 ppb |
| 2014-12-09 | 1610-037-0930 | 18.1 ppb |
| 2014-12-09 | 1610-049-1025 | 19.1 ppb |
| 2014-12-09 | 1610-053-1040 | 18.7 ppb |
| 2015-03-02 | 1610-027-0700 | 17.4 ppb |
| 2015-03-02 | 1610-032-0815 | 18.0 ppb |
| 2015-03-02 | 1610-033-0825 | 15.6 ppb |
| 2015-03-02 | 1610-039-0735 | 14.0 ppb |
| 2015-03-02 | 1610-040-1045 | 18.4 ppb |
| 2015-03-02 | 1610-041-1030 | 14.1 ppb |
| 2015-03-02 | 1610-042-1055 | 14.4 ppb |
| 2015-03-02 | 1610-043-1110 | 16.3 ppb |
| 2015-03-02 | 1610-044-0920 | 17.7 ppb |
| 2015-03-02 | 1610-045-0935 | 18.7 ppb |
| 2015-03-04 | 1610-029-0815 | 9.86 ppb |
| 2015-03-04 | 1610-030-0825 | 11.8 ppb |
| 2015-03-04 | 1610-031-0840 | 14.5 ppb |
| 2015-03-04 | 1610-034-0725 | 15.2 ppb |
| 2015-03-04 | 1610-035-0715 | 16.7 ppb |
| 2015-03-04 | 1610-037-0920 | 17.2 ppb |
| 2015-03-04 | 1610-049-1010 | 16.3 ppb |
| 2015-03-04 | 1610-053-1025 | 17.6 ppb |
| 2015-06-01 | 1610-027-0710 | 15.6 ppb |
| 2015-06-01 | 1610-032-0825 | 17.7 ppb |
| 2015-06-01 | 1610-033-0835 | 13.2 ppb |
| 2015-06-01 | 1610-039-0745 | 9.91 ppb |
| 2015-06-01 | 1610-040-1055 | 19.3 ppb |
| 2015-06-01 | 1610-041-1045 | 14.1 ppb |
| 2015-06-01 | 1610-042-1105 | 15.9 ppb |
| 2015-06-01 | 1610-043-1120 | 15.0 ppb |
| 2015-06-01 | 1610-044-0940 | 14.6 ppb |
| 2015-06-01 | 1610-045-0930 | 17.0 ppb |
| 2015-06-02 | 1610-029-0830 | 8.06 ppb |
| 2015-06-02 | 1610-030-0845 | 9.25 ppb |
| 2015-06-02 | 1610-031-0900 | 10.4 ppb |
| 2015-06-02 | 1610-034-0725 | 12.1 ppb |
| 2015-06-02 | 1610-035-0715 | 13.3 ppb |
| 2015-06-02 | 1610-037-0940 | 12.2 ppb |
| 2015-06-02 | 1610-049-1045 | 11.9 ppb |
| 2015-06-02 | 1610-053-1030 | 12.1 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 | 16.8 ppb |
| 2015-09-08 | 1610-032-0815 | 18.5 ppb |
| 2015-09-08 | 1610-033-0830 | 12.4 ppb |
| 2015-09-08 | 1610-039-0730 | 9.75 ppb |
| 2015-09-08 | 1610-040-1045 | 17.6 ppb |
| 2015-09-08 | 1610-041-1030 | 12.8 ppb |
| 2015-09-08 | 1610-042-1100 | 14.8 ppb |
| 2015-09-08 | 1610-043-1115 | 11.6 ppb |
| 2015-09-08 | 1610-044-0930 | 18.2 ppb |
| 2015-09-08 | 1610-045-0915 | 19.8 ppb |
| 2015-09-09 | 1610-029-0820 | 8.99 ppb |
| 2015-09-09 | 1610-030-0900 | 9.84 ppb |
| 2015-09-09 | 1610-031-0840 | 10.8 ppb |
| 2015-09-09 | 1610-034-0730 | 6.12 ppb |
| 2015-09-09 | 1610-035-0715 | 8.88 ppb |
| 2015-09-09 | 1610-049-0945 | 13.4 ppb |
| 2015-09-09 | 1610-049-1055 | 12.1 ppb |
| 2015-09-09 | 1610-053-1040 | 12.9 ppb |
| 2015-12-17 | 1610-027-1440 | 17.0 ppb |
| 2015-12-17 | 1610-029-0940 | 11.4 ppb |
| 2015-12-17 | 1610-030-0950 | 12.3 ppb |
| 2015-12-17 | 1610-031-1000 | 13.2 ppb |
| 2015-12-17 | 1610-032-1340 | 11.8 ppb |
| 2015-12-17 | 1610-033-1350 | 19.0 ppb |
| 2015-12-17 | 1610-034-0850 | 10.1 ppb |
| 2015-12-17 | 1610-035-0900 | 12.5 ppb |
| 2015-12-17 | 1610-037-1220 | 13.9 ppb |
| 2015-12-17 | 1610-039-1415 | 12.4 ppb |
| 2015-12-17 | 1610-040-1500 | 17.2 ppb |
| 2015-12-17 | 1610-041-1510 | 14.5 ppb |
| 2015-12-17 | 1610-042-1515 | 14.7 ppb |
| 2015-12-17 | 1610-043-1530 | 12.3 ppb |
| 2015-12-17 | 1610-044-1300 | 14.5 ppb |
| 2015-12-17 | 1610-045-1310 | 14.2 ppb |
| 2015-12-17 | 1610-049-1040 | 14.5 ppb |
| 2015-12-17 | 1610-053-1050 | 14.9 ppb |
| 2016-03-08 | 1610-027-1300 | 22.7 ppb |
| 2016-03-08 | 1610-032-1130 | 17.1 ppb |
| 2016-03-08 | 1610-033-1140 | 24.0 ppb |
| 2016-03-08 | 1610-039-1220 | 17.5 ppb |
| 2016-03-08 | 1610-040-1400 | 27.5 ppb |
| 2016-03-08 | 1610-041-1410 | 19.7 ppb |
| 2016-03-08 | 1610-042-1420 | 20.0 ppb |
| 2016-03-08 | 1610-043-1430 | 19.7 ppb |
| 2016-03-08 | 1610-044-1030 | 22.5 ppb |
| 2016-03-08 | 1610-045-1040 | 24.9 ppb |
| 2016-03-09 | 1610-029-1015 | 15.2 ppb |
| 2016-03-09 | 1610-030-1025 | 16.6 ppb |
| 2016-03-09 | 1610-031-1035 | 17.5 ppb |
| 2016-03-09 | 1610-034-1400 | 17.7 ppb |
| 2016-03-09 | 1610-035-1410 | 20.7 ppb |
| 2016-03-09 | 1610-037-1200 | 19.5 ppb |
| 2016-03-09 | 1610-049-1210 | 15.7 ppb |
| 2016-03-09 | 1610-053-0940 | 16.9 ppb |
| 2016-06-08 | 1610-027-1200 | 12.4 ppb |
| 2016-06-08 | 1610-032-1300 | 14.9 ppb |
| 2016-06-08 | 1610-033-1310 | 10.6 ppb |
| 2016-06-08 | 1610-039-1215 | 9.54 ppb |
| 2016-06-08 | 1610-040-1100 | 22.2 ppb |
| 2016-06-08 | 1610-041-1110 | 13.0 ppb |
| 2016-06-08 | 1610-042-1115 | 15.2 ppb |
| 2016-06-08 | 1610-043-1125 | 13.8 ppb |
| 2016-06-08 | 1610-044-1400 | 13.6 ppb |
| 2016-06-08 | 1610-045-1410 | 14.6 ppb |
| 2016-06-27 | 1610-029-1000 | 10.00 ppb |
| 2016-06-27 | 1610-030-1010 | 10.9 ppb |
| 2016-06-27 | 1610-031-1020 | 13.0 ppb |
| 2016-06-27 | 1610-034-0840 | 19.6 ppb |
| 2016-06-27 | 1610-035-0850 | 12.0 ppb |
| 2016-06-27 | 1610-037-1100 | 19.8 ppb |
| 2016-06-27 | 1610-049-1200 | 12.1 ppb |
| 2016-06-27 | 1610-053-1210 | 12.7 ppb |
| 2016-09-27 | 1610-029-1010 | 9.85 ppb |
| 2016-09-27 | 1610-030-1020 | 11.3 ppb |
| 2016-09-27 | 1610-031-1030 | 11.5 ppb |
| 2016-09-27 | 1610-034-0910 | 10.1 ppb |
| 2016-09-27 | 1610-035-0920 | 12.7 ppb |
| 2016-09-27 | 1610-037-1100 | 14.3 ppb |
| 2016-09-27 | 1610-049-1220 | 13.1 ppb |
| 2016-09-27 | 1610-053-1230 | 15.6 ppb |
| 2016-09-28 | 1610-027-1020 | 12.8 ppb |
| 2016-09-28 | 1610-032-1120 | 15.5 ppb |
| 2016-09-28 | 1610-033-1130 | 13.5 ppb |
| 2016-09-28 | 1610-039-1045 | 10.6 ppb |
| 2016-09-28 | 1610-040-0910 | 17.3 ppb |
| 2016-09-28 | 1610-041-0920 | 14.1 ppb |
| 2016-09-28 | 1610-042-0930 | 13.4 ppb |
| 2016-09-28 | 1610-043-0940 | 15.4 ppb |
| 2016-09-28 | 1610-044-1215 | 15.6 ppb |
| 2016-09-28 | 1610-045-1225 | 17.7 ppb |
| 2016-12-14 | 1610-029-1000 | 15.9 ppb |
| 2016-12-14 | 1610-030-1010 | 16.9 ppb |
| 2016-12-14 | 1610-031-1020 | 19.9 ppb |
| 2016-12-14 | 1610-034-0900 | 16.4 ppb |
| 2016-12-14 | 1610-035-0910 | 19.1 ppb |
| 2016-12-14 | 1610-037-1120 | 20.7 ppb |
| 2016-12-14 | 1610-049-1200 | 20.6 ppb |
| 2016-12-14 | 1610-053-1210 | 20.6 ppb |
| 2016-12-20 | 1610-027-1150 | 14.6 ppb |
| 2016-12-20 | 1610-032-1020 | 20.4 ppb |
| 2016-12-20 | 1610-033-1030 | 17.2 ppb |
| 2016-12-20 | 1610-039-1120 | 16.4 ppb |
| 2016-12-20 | 1610-040-1235 | 17.0 ppb |
| 2016-12-20 | 1610-041-1240 | 15.9 ppb |
| 2016-12-20 | 1610-042-1245 | 15.3 ppb |
| 2016-12-20 | 1610-043-1300 | 15.7 ppb |
| 2016-12-20 | 1610-044-0930 | 20.5 ppb |
| 2016-12-20 | 1610-045-0940 | 19.6 ppb |
| 2017-03-14 | 1610-029-1000 | 7.88 ppb |
| 2017-03-14 | 1610-030-1010 | 7.62 ppb |
| 2017-03-14 | 1610-031-1020 | 10.5 ppb |
| 2017-03-14 | 1610-034-0910 | 10.5 ppb |
| 2017-03-14 | 1610-035-0920 | 12.0 ppb |
| 2017-03-14 | 1610-037-1115 | 11.9 ppb |
| 2017-03-14 | 1610-049-1210 | 11.6 ppb |
| 2017-03-14 | 1610-053-1220 | 12.6 ppb |
| 2017-03-16 | 1610-027-1130 | 12.9 ppb |
| 2017-03-16 | 1610-032-1040 | 12.2 ppb |
| 2017-03-16 | 1610-033-1050 | 13.4 ppb |
| 2017-03-16 | 1610-039-1115 | 9.76 ppb |
| 2017-03-16 | 1610-040-1150 | 14.7 ppb |
| 2017-03-16 | 1610-041-1200 | 13.2 ppb |
| 2017-03-16 | 1610-042-1210 | 13.3 ppb |
| 2017-03-16 | 1610-043-1220 | 11.2 ppb |
| 2017-03-16 | 1610-044-0940 | 14.8 ppb |
| 2017-03-16 | 1610-045-0950 | 17.2 ppb |
| 2017-06-06 | 1610-027-1200 | 9.14 ppb |
| 2017-06-06 | 1610-032-1100 | 11.1 ppb |
| 2017-06-06 | 1610-033-1110 | 8.23 ppb |
| 2017-06-06 | 1610-039-1140 | 7.43 ppb |
| 2017-06-06 | 1610-040-1230 | 12.1 ppb |
| 2017-06-06 | 1610-041-1240 | 9.07 ppb |
| 2017-06-06 | 1610-042-1250 | 9.08 ppb |
| 2017-06-06 | 1610-043-1300 | 8.65 ppb |
| 2017-06-06 | 1610-044-1010 | 11.2 ppb |
| 2017-06-06 | 1610-045-1020 | 12.3 ppb |
| 2017-06-07 | 1610-029-1020 | 9.36 ppb |
| 2017-06-07 | 1610-030-1030 | 5.88 ppb |
| 2017-06-07 | 1610-031-1040 | 7.24 ppb |
| 2017-06-07 | 1610-034-0850 | 8.15 ppb |
| 2017-06-07 | 1610-035-0900 | 5.73 ppb |
| 2017-06-07 | 1610-037-1125 | 12.0 ppb |
| 2017-06-07 | 1610-049-1155 | 10.2 ppb |
| 2017-06-07 | 1610-053-1200 | 12.4 ppb |
| 2017-09-13 | 1610-029-1030 | 7.68 ppb |
| 2017-09-13 | 1610-030-1040 | 8.56 ppb |
| 2017-09-13 | 1610-031-1050 | 9.88 ppb |
| 2017-09-13 | 1610-034-0930 | 7.78 ppb |
| 2017-09-13 | 1610-035-0940 | 9.27 ppb |
| 2017-09-13 | 1610-037-1130 | 10.2 ppb |
| 2017-09-13 | 1610-049-1210 | 12.8 ppb |
| 2017-09-13 | 1610-053-1220 | 14.5 ppb |
| 2017-09-25 | 1610-027-1225 | 9.73 ppb |
| 2017-09-25 | 1610-032-1145 | 12.5 ppb |
| 2017-09-25 | 1610-033-1155 | 7.36 ppb |
| 2017-09-25 | 1610-039-1215 | 9.74 ppb |
| 2017-09-25 | 1610-040-1250 | 15.3 ppb |
| 2017-09-25 | 1610-041-1255 | 11.9 ppb |
| 2017-09-25 | 1610-042-1300 | 11.3 ppb |
| 2017-09-25 | 1610-043-1310 | 11.9 ppb |
| 2017-09-25 | 1610-044-1100 | 13.1 ppb |
| 2017-09-25 | 1610-045-1110 | 15.0 ppb |
| 2017-11-28 | 1610-029-1015 | 5.64 ppb |
| 2017-11-28 | 1610-030-1025 | 6.87 ppb |
| 2017-11-28 | 1610-031-1035 | 8.78 ppb |
| 2017-11-28 | 1610-034-0910 | 6.10 ppb |
| 2017-11-28 | 1610-035-0920 | 7.58 ppb |
| 2017-11-28 | 1610-037-1110 | 7.58 ppb |
| 2017-11-28 | 1610-049-1200 | 10.1 ppb |
| 2017-11-28 | 1610-053-1210 | 10.0 ppb |
| 2017-11-29 | 1610-027-1205 | 9.54 ppb |
| 2017-11-29 | 1610-032-1020 | 10.6 ppb |
| 2017-11-29 | 1610-033-1030 | 12.1 ppb |
| 2017-11-29 | 1610-039-1130 | 10.5 ppb |
| 2017-11-29 | 1610-040-1230 | 8.80 ppb |
| 2017-11-29 | 1610-041-1240 | 13.5 ppb |
| 2017-11-29 | 1610-042-1245 | 8.43 ppb |
| 2017-11-29 | 1610-043-1250 | 8.20 ppb |
| 2017-11-29 | 1610-044-0940 | 10.7 ppb |
| 2017-11-29 | 1610-045-0950 | 12.6 ppb |
| 2018-03-06 | 1610-029-1010 | 4.69 ppb |
| 2018-03-06 | 1610-030-1020 | 5.70 ppb |
| 2018-03-06 | 1610-031-1030 | 8.07 ppb |
| 2018-03-06 | 1610-034-0920 | 12.1 ppb |
| 2018-03-06 | 1610-035-0930 | 12.6 ppb |
| 2018-03-06 | 1610-037-1100 | 11.3 ppb |
| 2018-03-06 | 1610-049-1210 | 8.99 ppb |
| 2018-03-06 | 1610-053-1220 | 9.83 ppb |
| 2018-03-28 | 1610-027-1200 | 13.4 ppb |
| 2018-03-28 | 1610-032-1100 | 15.8 ppb |
| 2018-03-28 | 1610-033-1110 | 13.3 ppb |
| 2018-03-28 | 1610-039-1140 | 11.2 ppb |
| 2018-03-28 | 1610-040-1215 | 17.0 ppb |
| 2018-03-28 | 1610-041-1220 | 12.8 ppb |
| 2018-03-28 | 1610-042-1230 | 13.3 ppb |
| 2018-03-28 | 1610-043-1240 | 13.7 ppb |
| 2018-03-28 | 1610-044-1010 | 17.6 ppb |
| 2018-03-28 | 1610-045-1020 | 17.4 ppb |
| 2018-06-14 | 1610-029-0950 | 6.17 ppb |
| 2018-06-14 | 1610-030-1000 | 6.75 ppb |
| 2018-06-14 | 1610-031-1010 | 9.28 ppb |
| 2018-06-14 | 1610-034-0835 | 7.12 ppb |
| 2018-06-14 | 1610-035-0840 | 8.37 ppb |
| 2018-06-14 | 1610-037-1050 | 11.5 ppb |
| 2018-06-14 | 1610-049-1200 | 12.6 ppb |
| 2018-06-14 | 1610-053-1210 | 12.7 ppb |
| 2018-06-19 | 1610-027-1150 | 13.0 ppb |
| 2018-06-19 | 1610-032-1040 | 11.0 ppb |
| 2018-06-19 | 1610-033-1050 | 10.8 ppb |
| 2018-06-19 | 1610-039-1130 | 8.57 ppb |
| 2018-06-19 | 1610-040-1215 | 17.7 ppb |
| 2018-06-19 | 1610-041-1220 | 10.5 ppb |
| 2018-06-19 | 1610-042-1230 | 13.6 ppb |
| 2018-06-19 | 1610-043-1240 | 13.9 ppb |
| 2018-06-19 | 1610-044-1000 | 13.5 ppb |
| 2018-06-19 | 1610-045-1010 | 14.3 ppb |
| 2018-09-19 | 1610-029-1030 | 7.67 ppb |
| 2018-09-19 | 1610-030-1040 | 7.80 ppb |
| 2018-09-19 | 1610-031-1050 | 10.5 ppb |
| 2018-09-19 | 1610-034-0945 | 6.03 ppb |
| 2018-09-19 | 1610-035-0955 | 8.33 ppb |
| 2018-09-19 | 1610-037-1120 | 12.4 ppb |
| 2018-09-19 | 1610-049-1255 | 13.3 ppb |
| 2018-09-19 | 1610-053-1310 | 13.7 ppb |
| 2018-09-25 | 1610-027-1310 | 12.5 ppb |
| 2018-09-25 | 1610-032-1115 | 18.0 ppb |
| 2018-09-25 | 1610-033-1125 | 12.0 ppb |
| 2018-09-25 | 1610-039-1210 | 10.2 ppb |
| 2018-09-25 | 1610-040-1320 | 14.9 ppb |
| 2018-09-25 | 1610-041-1330 | 21.1 ppb |
| 2018-09-25 | 1610-042-1335 | 15.9 ppb |
| 2018-09-25 | 1610-043-1340 | 15.4 ppb |
| 2018-09-25 | 1610-044-1030 | 13.3 ppb |
| 2018-09-25 | 1610-045-1040 | 20.5 ppb |
| 2018-12-18 | 1610-029-1010 | 10.7 ppb |
| 2018-12-18 | 1610-031-1030 | 13.4 ppb |
| 2018-12-18 | 1610-034-0905 | 15.7 ppb |
| 2018-12-18 | 1610-035-0910 | 18.7 ppb |
| 2018-12-18 | 1610-037-1100 | 15.8 ppb |
| 2018-12-18 | 1610-049-1150 | 11.6 ppb |
| 2018-12-18 | 1610-053-1200 | 17.9 ppb |
| 2018-12-19 | 1610-027-1010 | 11.2 ppb |
| 2018-12-19 | 1610-032-1130 | 13.8 ppb |
| 2018-12-19 | 1610-033-1120 | 12.0 ppb |
| 2018-12-19 | 1610-039-1045 | 10.2 ppb |
| 2018-12-19 | 1610-040-0910 | 15.2 ppb |
| 2018-12-19 | 1610-041-0920 | 10.3 ppb |
| 2018-12-19 | 1610-042-0930 | 12.6 ppb |
| 2018-12-19 | 1610-043-0940 | 10.7 ppb |
| 2018-12-19 | 1610-044-1230 | 14.4 ppb |
| 2018-12-19 | 1610-045-1240 | 14.1 ppb |
| 2018-12-27 | 1610-030-0815 | ND |
| 2019-03-12 | 1610-029-1045 | 11.9 ppb |
| 2019-03-12 | 1610-030-1055 | 13.0 ppb |
| 2019-03-12 | 1610-031-1100 | 16.6 ppb |
| 2019-03-12 | 1610-034-0945 | 16.6 ppb |
| 2019-03-12 | 1610-035-1000 | 18.6 ppb |
| 2019-03-12 | 1610-037-1200 | 13.5 ppb |
| 2019-03-12 | 1610-049-1300 | 14.2 ppb |
| 2019-03-12 | 1610-053-1310 | 15.8 ppb |
| 2019-03-13 | 1610-027-1230 | 20.3 ppb |
| 2019-03-13 | 1610-032-1120 | 18.9 ppb |
| 2019-03-13 | 1610-033-1130 | 17.3 ppb |
| 2019-03-13 | 1610-039-1215 | 19.5 ppb |
| 2019-03-13 | 1610-043-1400 | 13.4 ppb |
| 2019-03-13 | 1610-044-1010 | 21.4 ppb |
| 2019-03-13 | 1610-045-1020 | 20.7 ppb |
| 2019-03-29 | 1610-040-1010 | 9.74 ppb |
| 2019-03-29 | 1610-041-1000 | 9.75 ppb |
| 2019-03-29 | 1610-042-1020 | 9.43 ppb |
| 2019-06-19 | 1610-029-1040 | 10.2 ppb |
| 2019-06-19 | 1610-030-1050 | 12.0 ppb |
| 2019-06-19 | 1610-031-1100 | 13.6 ppb |
| 2019-06-19 | 1610-034-0920 | 12.6 ppb |
| 2019-06-19 | 1610-035-0930 | 12.5 ppb |
| 2019-06-19 | 1610-037-1150 | 15.7 ppb |
| 2019-06-19 | 1610-049-1230 | 14.3 ppb |
| 2019-06-19 | 1610-053-1240 | 17.2 ppb |
| 2019-06-25 | 1610-027-1115 | 17.4 ppb |
| 2019-06-25 | 1610-032-1030 | 19.9 ppb |
| 2019-06-25 | 1610-033-1040 | 15.5 ppb |
| 2019-06-25 | 1610-039-1100 | 13.3 ppb |
| 2019-06-25 | 1610-040-1215 | 17.2 ppb |
| 2019-06-25 | 1610-041-1220 | 19.4 ppb |
| 2019-06-25 | 1610-042-1230 | 24.1 ppb |
| 2019-06-25 | 1610-043-1240 | 19.9 ppb |
| 2019-06-25 | 1610-044-0945 | 20.3 ppb |
| 2019-06-25 | 1610-045-0950 | 20.8 ppb |
| 2019-09-17 | 1610-029-1020 | 9.27 ppb |
| 2019-09-17 | 1610-030-1030 | 10.7 ppb |
| 2019-09-17 | 1610-031-1040 | 10.8 ppb |
| 2019-09-17 | 1610-034-0905 | 10.8 ppb |
| 2019-09-17 | 1610-035-0915 | 12.4 ppb |
| 2019-09-17 | 1610-037-1110 | 13.9 ppb |
| 2019-09-17 | 1610-049-1210 | 15.1 ppb |
| 2019-09-17 | 1610-053-1215 | 16.0 ppb |
| 2019-09-24 | 1610-027-1115 | 11.7 ppb |
| 2019-09-24 | 1610-032-1040 | 15.9 ppb |
| 2019-09-24 | 1610-033-1045 | 9.48 ppb |
| 2019-09-24 | 1610-039-1100 | 6.87 ppb |
| 2019-09-24 | 1610-040-1150 | 10.6 ppb |
| 2019-09-24 | 1610-041-1155 | 15.3 ppb |
| 2019-09-24 | 1610-042-1200 | 14.7 ppb |
| 2019-09-24 | 1610-043-1230 | 14.7 ppb |
| 2019-09-24 | 1610-044-1000 | 13.9 ppb |
| 2019-09-24 | 1610-045-1010 | 14.4 ppb |
| 2019-11-21 | 1610-034-0930 | 8.47 ppb |
| 2019-11-21 | 1610-035-0940 | 9.95 ppb |
| 2019-12-18 | 1610-027-1245 | 12.4 ppb |
| 2019-12-18 | 1610-029-0905 | 12.5 ppb |
| 2019-12-18 | 1610-030-0910 | 13.7 ppb |
| 2019-12-18 | 1610-031-0915 | 15.8 ppb |
| 2019-12-18 | 1610-032-1215 | 13.3 ppb |
| 2019-12-18 | 1610-033-1220 | 18.1 ppb |
| 2019-12-18 | 1610-037-1020 | 19.6 ppb |
| 2019-12-18 | 1610-039-1235 | 16.0 ppb |
| 2019-12-18 | 1610-040-1305 | 15.7 ppb |
| 2019-12-18 | 1610-041-1310 | 16.2 ppb |
| 2019-12-18 | 1610-043-1315 | 17.2 ppb |
| 2019-12-18 | 1610-043-1320 | 16.3 ppb |
| 2019-12-18 | 1610-044-1135 | 17.6 ppb |
| 2019-12-18 | 1610-045-1140 | 15.2 ppb |
| 2019-12-18 | 1610-049-1040 | 16.0 ppb |
| 2019-12-18 | 1610-053-1045 | 18.4 ppb |