Nitrate
San Jose Water Company
Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.
614
Samples
0
Samples exceeding legal limit (MCL)
599
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 | 3.06 ppm | 108 | 107 | ND - 7.00 ppm |
| 2015 | 3.53 ppm | 101 | 96 | ND - 7.68 ppm |
| 2016 | 3.24 ppm | 107 | 105 | ND - 8.20 ppm |
| 2017 | 3.14 ppm | 88 | 84 | ND - 7.10 ppm |
| 2018 | 3.53 ppm | 102 | 101 | ND - 6.50 ppm |
| 2019 | 3.38 ppm | 108 | 106 | ND - 6.30 ppm |
ppm = parts per million
State and national drinking water standards and health guidelines
EWG Health Guideline 0.14 ppm
The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.
EPA Maximum Contaminant
Level (MCL) 10 ppm
The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.
ppm = parts per million
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-01-07 | 1610-003-0815 | 1.36 ppm |
| 2014-01-07 | 1610-067-0905 | 1.42 ppm |
| 2014-01-08 | 1610-136-0913 | 2.94 ppm |
| 2014-01-09 | 1610-025-1400 | 2.48 ppm |
| 2014-01-13 | 1610-093-0850 | 3.84 ppm |
| 2014-02-04 | 1610-002-0820 | 0.904 ppm |
| 2014-02-04 | 1610-023-0915 | 3.39 ppm |
| 2014-02-05 | 1610-130-1020 | 2.94 ppm |
| 2014-02-05 | 1610-176-0925 | 4.52 ppm |
| 2014-02-10 | 1610-173-1355 | 1.29 ppm |
| 2014-03-04 | 1610-112-0940 | 5.42 ppm |
| 2014-03-04 | 1610-113-0925 | 5.20 ppm |
| 2014-03-04 | 1610-117-0917 | 3.39 ppm |
| 2014-03-05 | 1610-169-0932 | 2.71 ppm |
| 2014-03-05 | 1610-180-0915 | 2.94 ppm |
| 2014-03-06 | 1610-178-0845 | 2.48 ppm |
| 2014-03-06 | 1610-183-0934 | 1.94 ppm |
| 2014-03-11 | 1610-074-1050 | ND |
| 2014-03-11 | 1610-126-0930 | 4.97 ppm |
| 2014-03-11 | 1610-177-1230 | 1.02 ppm |
| 2014-03-11 | 1610-182-1145 | 4.29 ppm |
| 2014-03-12 | 1610-170-0900 | 2.94 ppm |
| 2014-03-12 | 1610-171-0930 | 2.94 ppm |
| 2014-03-17 | 1610-141-1031 | 1.60 ppm |
| 2014-04-03 | 1610-033-1050 | 3.39 ppm |
| 2014-04-08 | 1610-086-1055 | 2.94 ppm |
| 2014-04-08 | 1610-093-1020 | 2.06 ppm |
| 2014-04-08 | 1610-181-1000 | 2.94 ppm |
| 2014-04-09 | 1610-131-1425 | 4.52 ppm |
| 2014-04-09 | 1610-143-0905 | 1.97 ppm |
| 2014-04-23 | 1610-016-0905 | 1.58 ppm |
| 2014-04-23 | 1610-173-0925 | 0.791 ppm |
| 2014-05-01 | 1610-070-0910 | 4.29 ppm |
| 2014-05-12 | 1610-113-1100 | 4.97 ppm |
| 2014-05-13 | 1610-108-1050 | 2.94 ppm |
| 2014-06-02 | 1610-111-1020 | 5.65 ppm |
| 2014-06-02 | 1610-112-1030 | 5.20 ppm |
| 2014-06-03 | 1610-169-0815 | 2.24 ppm |
| 2014-06-03 | 1610-180-0820 | 2.94 ppm |
| 2014-06-09 | 1610-126-0945 | 4.74 ppm |
| 2014-06-09 | 1610-134-1020 | 2.94 ppm |
| 2014-06-10 | 1610-179-0915 | 2.94 ppm |
| 2014-06-11 | 1610-108-0950 | 3.16 ppm |
| 2014-06-16 | 1610-186-0845 | 3.39 ppm |
| 2014-07-08 | 1610-133-0912 | 2.94 ppm |
| 2014-07-10 | 1610-172-1000 | 4.97 ppm |
| 2014-08-05 | 1610-072-0855 | 2.94 ppm |
| 2014-08-05 | 1610-184-0920 | 4.97 ppm |
| 2014-08-06 | 1610-003-0820 | 1.20 ppm |
| 2014-08-07 | 1610-131-0835 | 4.74 ppm |
| 2014-08-14 | 1610-114-0845 | 3.84 ppm |
| 2014-08-14 | 1610-183-0945 | 2.10 ppm |
| 2014-08-18 | 1610-109-1005 | 3.16 ppm |
| 2014-08-18 | 1610-110-0950 | 2.94 ppm |
| 2014-08-21 | 1610-029-0820 | 6.55 ppm |
| 2014-09-04 | 1610-126-0944 | 4.52 ppm |
| 2014-09-04 | 1610-186-1015 | 2.26 ppm |
| 2014-09-11 | 1610-111-0936 | 4.52 ppm |
| 2014-09-11 | 1610-112-0945 | 4.97 ppm |
| 2014-09-11 | 1610-113-1000 | 4.97 ppm |
| 2014-09-23 | 1610-027-0845 | 7.00 ppm |
| 2014-09-25 | 1610-187-0900 | 3.16 ppm |
| 2014-10-01 | 1610-004-0830 | 0.791 ppm |
| 2014-10-01 | 1610-005-1010 | 0.881 ppm |
| 2014-10-01 | 1610-168-0850 | 1.06 ppm |
| 2014-10-02 | 1610-022-0835 | 4.97 ppm |
| 2014-10-02 | 1610-088-0950 | 2.71 ppm |
| 2014-10-02 | 1610-172-1005 | 3.39 ppm |
| 2014-10-02 | 1610-182-0930 | 3.61 ppm |
| 2014-10-02 | 1610-184-0855 | 4.52 ppm |
| 2014-10-14 | 1610-135-1050 | 1.85 ppm |
| 2014-10-14 | 1610-136-0925 | 2.48 ppm |
| 2014-10-14 | 1610-138-0945 | 1.33 ppm |
| 2014-10-16 | 1610-086-1020 | 3.16 ppm |
| 2014-10-29 | 1610-113-0835 | 4.97 ppm |
| 2014-10-29 | 1610-118-0910 | 3.84 ppm |
| 2014-10-30 | 1610-125-0820 | 2.94 ppm |
| 2014-10-30 | 1610-126-0815 | 4.52 ppm |
| 2014-10-30 | 1610-128-0825 | 2.71 ppm |
| 2014-11-03 | 1610-102-0859 | 0.587 ppm |
| 2014-11-05 | 1610-030-1230 | 2.94 ppm |
| 2014-11-05 | 1610-088-0925 | 2.71 ppm |
| 2014-11-05 | 1610-094-0940 | 3.61 ppm |
| 2014-11-12 | 1610-140-1100 | 1.36 ppm |
| 2014-11-12 | 1610-141-1140 | 1.76 ppm |
| 2014-11-12 | 1610-142-1115 | 2.26 ppm |
| 2014-11-12 | 1610-143-1130 | 2.03 ppm |
| 2014-11-12 | 1610-144-1145 | 1.15 ppm |
| 2014-11-13 | 1610-034-1145 | 3.16 ppm |
| 2014-11-24 | 1610-107-1220 | 2.94 ppm |
| 2014-12-02 | 1610-004-0905 | 0.745 ppm |
| 2014-12-02 | 1610-030-0955 | 3.16 ppm |
| 2014-12-02 | 1610-031-0940 | 3.39 ppm |
| 2014-12-02 | 1610-067-1035 | 1.58 ppm |
| 2014-12-02 | 1610-068-1020 | 1.87 ppm |
| 2014-12-02 | 1610-070-0830 | 3.39 ppm |
| 2014-12-02 | 1610-111-1400 | 5.87 ppm |
| 2014-12-02 | 1610-112-1415 | 4.97 ppm |
| 2014-12-02 | 1610-179-1130 | 2.94 ppm |
| 2014-12-03 | 1610-109-1045 | 2.71 ppm |
| 2014-12-03 | 1610-116-1250 | 2.94 ppm |
| 2014-12-03 | 1610-130-0825 | 4.29 ppm |
| 2014-12-03 | 1610-131-0835 | 4.52 ppm |
| 2014-12-03 | 1610-135-0840 | 1.81 ppm |
| 2014-12-03 | 1610-137-0850 | 2.08 ppm |
| 2014-12-03 | 1610-138-0950 | 1.27 ppm |
| 2014-12-03 | 1610-175-1055 | 2.71 ppm |
| 2014-12-10 | 1610-024-0905 | 1.92 ppm |
| 2015-01-06 | 1610-027-0822 | 6.78 ppm |
| 2015-01-06 | 1610-184-0834 | 4.74 ppm |
| 2015-01-07 | 1610-108-1140 | 2.71 ppm |
| 2015-01-07 | 1610-175-1140 | 2.71 ppm |
| 2015-01-08 | 1610-003-0958 | 1.60 ppm |
| 2015-01-08 | 1610-029-0830 | 6.10 ppm |
| 2015-01-12 | 1610-136-0940 | 2.48 ppm |
| 2015-01-12 | 1610-137-0915 | 1.27 ppm |
| 2015-01-12 | 1610-187-0930 | 3.39 ppm |
| 2015-01-13 | 1610-074-1108 | ND |
| 2015-01-13 | 1610-085-0905 | ND |
| 2015-01-14 | 1610-186-1355 | 4.52 ppm |
| 2015-01-28 | 1610-025-0854 | 2.48 ppm |
| 2015-02-04 | 1610-002-0905 | 0.926 ppm |
| 2015-02-04 | 1610-022-0850 | 5.20 ppm |
| 2015-02-05 | 1610-030-1305 | 3.16 ppm |
| 2015-02-05 | 1610-118-1055 | 3.84 ppm |
| 2015-02-05 | 1610-172-1110 | 3.84 ppm |
| 2015-02-05 | 1610-176-1135 | 3.16 ppm |
| 2015-02-23 | 1610-185-0840 | 0.678 ppm |
| 2015-03-03 | 1610-112-1105 | 4.74 ppm |
| 2015-03-03 | 1610-117-1049 | 3.39 ppm |
| 2015-03-03 | 1610-170-1138 | 2.94 ppm |
| 2015-03-03 | 1610-171-1146 | 2.94 ppm |
| 2015-03-04 | 1610-024-1120 | 3.39 ppm |
| 2015-03-10 | 1610-156-1200 | 7.68 ppm |
| 2015-03-11 | 1610-125-0925 | 3.16 ppm |
| 2015-03-11 | 1610-126-0948 | 4.74 ppm |
| 2015-03-11 | 1610-131-0955 | 4.29 ppm |
| 2015-03-12 | 1610-177-1119 | ND |
| 2015-03-12 | 1610-178-1130 | 2.94 ppm |
| 2015-03-12 | 1610-179-1155 | 2.71 ppm |
| 2015-03-12 | 1610-180-1006 | 2.71 ppm |
| 2015-03-12 | 1610-180-1119 | ND |
| 2015-03-12 | 1610-183-1215 | 2.12 ppm |
| 2015-03-19 | 1610-092-0840 | 4.52 ppm |
| 2015-04-02 | 1610-029-0850 | 6.33 ppm |
| 2015-04-02 | 1610-168-0920 | 1.02 ppm |
| 2015-04-06 | 1610-101-0820 | 0.633 ppm |
| 2015-04-08 | 1610-088-1100 | 2.94 ppm |
| 2015-04-08 | 1610-093-1035 | 3.61 ppm |
| 2015-04-08 | 1610-156-0825 | 7.68 ppm |
| 2015-04-08 | 1610-181-0915 | 3.84 ppm |
| 2015-04-09 | 1610-027-1325 | 6.78 ppm |
| 2015-04-13 | 1610-016-0930 | 0.474 ppm |
| 2015-04-13 | 1610-173-0905 | ND |
| 2015-04-14 | 1610-086-0900 | 3.16 ppm |
| 2015-05-14 | 1610-128-0846 | 3.39 ppm |
| 2015-05-14 | 1610-130-0918 | 4.07 ppm |
| 2015-05-14 | 1610-135-0945 | 2.71 ppm |
| 2015-05-19 | 1610-113-1050 | 5.20 ppm |
| 2015-05-28 | 1610-022-0900 | 5.42 ppm |
| 2015-06-02 | 1610-070-0840 | 3.84 ppm |
| 2015-06-02 | 1610-107-0950 | 2.71 ppm |
| 2015-06-02 | 1610-111-1020 | 5.65 ppm |
| 2015-06-02 | 1610-112-1030 | 4.74 ppm |
| 2015-06-02 | 1610-142-0910 | 3.16 ppm |
| 2015-06-03 | 1610-126-0915 | 4.97 ppm |
| 2015-06-03 | 1610-131-0930 | 4.07 ppm |
| 2015-06-03 | 1610-134-1022 | 3.16 ppm |
| 2015-07-08 | 1610-128-0845 | 3.84 ppm |
| 2015-07-08 | 1610-133-0855 | 3.61 ppm |
| 2015-07-08 | 1610-135-0915 | 2.21 ppm |
| 2015-07-16 | 1610-116-0900 | 3.16 ppm |
| 2015-07-23 | 1610-027-1216 | 6.78 ppm |
| 2015-07-28 | 1610-169-0940 | 2.48 ppm |
| 2015-08-04 | 1610-023-1230 | 4.29 ppm |
| 2015-08-04 | 1610-033-1030 | 3.61 ppm |
| 2015-08-05 | 1610-072-1100 | 2.94 ppm |
| 2015-08-06 | 1610-031-0910 | 3.84 ppm |
| 2015-08-10 | 1610-114-0845 | 4.29 ppm |
| 2015-08-13 | 1610-029-1020 | 6.55 ppm |
| 2015-08-18 | 1610-022-0925 | 5.42 ppm |
| 2015-08-26 | 1610-156-1120 | 7.68 ppm |
| 2015-08-31 | 1610-110-0925 | 2.94 ppm |
| 2015-09-02 | 1610-111-0840 | 5.42 ppm |
| 2015-09-02 | 1610-112-0850 | 4.97 ppm |
| 2015-09-03 | 1610-126-0823 | 4.74 ppm |
| 2015-09-03 | 1610-131-0850 | 4.07 ppm |
| 2015-09-24 | 1610-090-1145 | 3.61 ppm |
| 2015-10-07 | 1610-137-0940 | 2.24 ppm |
| 2015-10-13 | 1610-156-1150 | 7.45 ppm |
| 2015-10-15 | 1610-005-0940 | 0.836 ppm |
| 2015-10-20 | 1610-126-0840 | 5.00 ppm |
| 2015-11-09 | 1610-141-1305 | 1.81 ppm |
| 2015-11-17 | 1610-108-1300 | 2.71 ppm |
| 2015-11-17 | 1610-143-1012 | 2.06 ppm |
| 2015-11-17 | 1610-144-1026 | 1.15 ppm |
| 2015-11-18 | 1610-109-1013 | 2.94 ppm |
| 2015-11-19 | 1610-034-1215 | 3.16 ppm |
| 2015-11-19 | 1610-172-1238 | 4.29 ppm |
| 2015-11-23 | 1610-138-0845 | 1.40 ppm |
| 2015-11-23 | 1610-156-1100 | 7.23 ppm |
| 2015-12-03 | 1610-068-0830 | 1.63 ppm |
| 2015-12-08 | 1610-024-0917 | 4.70 ppm |
| 2015-12-10 | 1610-126-0855 | 4.97 ppm |
| 2015-12-10 | 1610-131-0905 | 4.74 ppm |
| 2015-12-20 | 1610-022-2030 | 4.50 ppm |
| 2015-12-20 | 1610-140-1930 | 1.40 ppm |
| 2015-12-21 | 1610-067-1145 | 1.20 ppm |
| 2015-12-21 | 1610-129-1330 | 3.40 ppm |
| 2016-01-07 | 1610-136-0900 | 3.10 ppm |
| 2016-01-07 | 1610-185-0955 | 0.600 ppm |
| 2016-01-07 | 1610-186-0933 | 3.60 ppm |
| 2016-01-11 | 1610-003-1100 | 1.80 ppm |
| 2016-01-12 | 1610-187-1410 | 1.80 ppm |
| 2016-01-13 | 1610-094-0930 | 4.00 ppm |
| 2016-01-14 | 1610-143-1100 | 2.30 ppm |
| 2016-01-14 | 1610-144-1012 | 1.20 ppm |
| 2016-01-19 | 1610-027-1230 | 4.40 ppm |
| 2016-01-25 | 1610-112-0855 | 5.30 ppm |
| 2016-01-26 | 1610-093-0000 | 4.30 ppm |
| 2016-02-02 | 1610-002-0945 | 0.990 ppm |
| 2016-02-04 | 1610-107-1024 | 3.00 ppm |
| 2016-02-04 | 1610-108-1035 | 2.90 ppm |
| 2016-02-04 | 1610-125-0900 | 3.70 ppm |
| 2016-02-04 | 1610-131-1130 | 4.50 ppm |
| 2016-02-04 | 1610-185-0836 | 0.670 ppm |
| 2016-02-08 | 1610-141-0950 | 1.70 ppm |
| 2016-02-08 | 1610-142-0926 | 3.20 ppm |
| 2016-02-08 | 1610-143-0935 | 2.30 ppm |
| 2016-02-10 | 1610-111-0905 | 6.20 ppm |
| 2016-02-10 | 1610-116-0850 | 4.10 ppm |
| 2016-02-10 | 1610-172-0835 | 4.40 ppm |
| 2016-02-11 | 1610-004-0910 | 0.750 ppm |
| 2016-02-18 | 1610-030-1028 | 3.20 ppm |
| 2016-02-18 | 1610-113-1230 | 5.20 ppm |
| 2016-02-18 | 1610-117-1202 | 3.60 ppm |
| 2016-02-22 | 1610-031-0846 | 3.30 ppm |
| 2016-02-22 | 1610-034-0910 | 3.20 ppm |
| 2016-02-22 | 1610-067-1107 | 1.30 ppm |
| 2016-02-22 | 1610-068-0955 | 1.40 ppm |
| 2016-02-22 | 1610-114-1245 | 4.90 ppm |
| 2016-02-22 | 1610-178-1130 | 3.10 ppm |
| 2016-02-22 | 1610-179-1140 | 3.20 ppm |
| 2016-02-22 | 1610-183-1230 | 2.80 ppm |
| 2016-02-23 | 1610-025-0900 | 3.70 ppm |
| 2016-02-23 | 1610-085-1100 | ND |
| 2016-02-24 | 1610-126-1221 | 5.20 ppm |
| 2016-02-24 | 1610-128-1240 | 3.80 ppm |
| 2016-02-24 | 1610-130-1300 | 4.60 ppm |
| 2016-02-24 | 1610-133-1045 | 3.10 ppm |
| 2016-02-24 | 1610-134-1100 | 2.80 ppm |
| 2016-02-24 | 1610-135-1055 | 2.10 ppm |
| 2016-02-24 | 1610-137-1132 | 1.90 ppm |
| 2016-02-24 | 1610-140-1055 | 1.30 ppm |
| 2016-02-24 | 1610-169-0855 | 2.60 ppm |
| 2016-02-24 | 1610-180-0925 | 2.70 ppm |
| 2016-02-24 | 1610-186-1150 | 2.50 ppm |
| 2016-02-25 | 1610-005-1230 | 3.20 ppm |
| 2016-02-25 | 1610-086-1125 | 3.20 ppm |
| 2016-02-25 | 1610-181-1044 | 3.90 ppm |
| 2016-03-01 | 1610-070-1015 | 4.10 ppm |
| 2016-03-01 | 1610-101-0920 | 0.640 ppm |
| 2016-03-01 | 1610-138-0920 | 1.20 ppm |
| 2016-03-02 | 1610-090-0910 | 3.90 ppm |
| 2016-03-02 | 1610-092-0840 | 4.20 ppm |
| 2016-03-02 | 1610-093-0955 | 4.10 ppm |
| 2016-03-02 | 1610-118-1350 | 4.20 ppm |
| 2016-03-03 | 1610-088-0855 | 3.00 ppm |
| 2016-03-10 | 1610-109-1120 | 2.90 ppm |
| 2016-03-10 | 1610-175-1145 | 2.70 ppm |
| 2016-03-17 | 1610-168-0930 | 1.10 ppm |
| 2016-03-17 | 1610-176-1105 | 3.00 ppm |
| 2016-03-22 | 1610-156-1036 | 4.90 ppm |
| 2016-03-22 | 1610-156-1157 | 7.00 ppm |
| 2016-03-24 | 1610-016-1120 | 1.10 ppm |
| 2016-03-24 | 1610-173-0955 | 1.20 ppm |
| 2016-03-28 | 1610-022-1332 | 4.80 ppm |
| 2016-03-28 | 1610-023-0216 | 4.10 ppm |
| 2016-03-28 | 1610-129-1210 | 3.50 ppm |
| 2016-03-28 | 1610-177-0940 | 1.10 ppm |
| 2016-03-29 | 1610-171-1230 | 3.10 ppm |
| 2016-04-07 | 1610-102-0815 | 0.500 ppm |
| 2016-04-13 | 1610-156-0925 | 8.20 ppm |
| 2016-04-14 | 1610-184-0830 | 4.60 ppm |
| 2016-04-19 | 1610-027-1230 | 4.40 ppm |
| 2016-04-19 | 1610-029-1245 | 5.00 ppm |
| 2016-04-20 | 1610-022-1420 | 4.90 ppm |
| 2016-05-04 | 1233-198-1200 | 3.80 ppm |
| 2016-05-24 | 1610-075-1130 | ND |
| 2016-06-14 | 1610-092-1015 | 4.20 ppm |
| 2016-06-15 | 1610-144-1030 | 1.10 ppm |
| 2016-06-15 | 1233-199-1300 | 0.940 ppm |
| 2016-06-16 | 1610-170-1100 | 3.20 ppm |
| 2016-06-20 | 1610-093-1020 | 3.60 ppm |
| 2016-06-23 | 1610-067-1100 | 1.20 ppm |
| 2016-06-27 | 1610-126-0942 | 5.20 ppm |
| 2016-06-28 | 1610-024-0840 | 3.70 ppm |
| 2016-07-14 | 1610-022-0955 | 4.30 ppm |
| 2016-07-14 | 1610-126-0834 | 4.50 ppm |
| 2016-07-18 | 1610-027-0920 | 4.00 ppm |
| 2016-07-18 | 1610-185-0825 | 0.670 ppm |
| 2016-07-25 | 1610-029-0900 | 4.70 ppm |
| 2016-07-26 | 1233-198-1230 | 4.30 ppm |
| 2016-08-25 | 1233-194-1200 | 4.00 ppm |
| 2016-09-12 | 1610-022-1101 | 4.40 ppm |
| 2016-10-03 | 1233-196-1100 | 3.70 ppm |
| 2016-10-18 | 1610-022-0845 | 4.30 ppm |
| 2016-10-20 | 1610-029-0932 | 5.00 ppm |
| 2016-10-24 | 1610-027-0937 | 3.60 ppm |
| 2016-12-01 | 1610-094-1205 | 3.90 ppm |
| 2016-12-06 | 1610-185-1010 | 0.680 ppm |
| 2016-12-13 | 1610-108-0910 | 2.90 ppm |
| 2016-12-13 | 1610-126-0938 | 5.00 ppm |
| 2016-12-15 | 1233-195-1200 | 4.30 ppm |
| 2016-12-21 | 1610-170-1040 | 3.20 ppm |
| 2016-12-22 | 1610-156-1128 | 6.70 ppm |
| 2017-01-09 | 1610-128-1022 | 4.70 ppm |
| 2017-01-09 | 1610-129-1010 | 4.60 ppm |
| 2017-01-09 | 1610-130-1000 | 4.30 ppm |
| 2017-01-09 | 1610-134-0905 | 3.10 ppm |
| 2017-01-09 | 1610-137-0946 | 2.40 ppm |
| 2017-01-09 | 1610-186-0915 | 3.10 ppm |
| 2017-01-09 | 1610-187-0934 | 1.60 ppm |
| 2017-01-10 | 1610-126-0904 | 5.30 ppm |
| 2017-01-11 | 1610-031-0905 | 3.30 ppm |
| 2017-01-11 | 1610-108-0947 | 3.00 ppm |
| 2017-01-11 | 1610-109-1010 | 3.00 ppm |
| 2017-01-12 | 1610-002-0830 | 0.970 ppm |
| 2017-01-12 | 1610-025-0900 | 2.80 ppm |
| 2017-01-12 | 1610-067-1100 | 1.30 ppm |
| 2017-01-12 | 1610-070-0945 | 3.70 ppm |
| 2017-01-12 | 1610-180-1000 | 2.80 ppm |
| 2017-01-12 | 1610-181-1031 | 4.00 ppm |
| 2017-01-12 | 1610-184-0847 | 4.20 ppm |
| 2017-01-12 | 1610-185-0830 | 0.610 ppm |
| 2017-01-17 | 1610-023-0920 | 3.50 ppm |
| 2017-01-17 | 1610-027-0950 | 4.30 ppm |
| 2017-01-17 | 1610-085-1150 | ND |
| 2017-01-18 | 1610-068-1055 | 1.40 ppm |
| 2017-01-18 | 1610-172-1335 | 3.80 ppm |
| 2017-01-19 | 1610-029-1210 | 5.50 ppm |
| 2017-01-19 | 1610-034-1035 | 3.20 ppm |
| 2017-01-25 | 1610-142-0850 | 2.00 ppm |
| 2017-01-26 | 1610-022-1005 | 4.40 ppm |
| 2017-01-26 | 1610-086-1415 | 2.90 ppm |
| 2017-01-26 | 1610-170-1115 | 3.10 ppm |
| 2017-01-26 | 1610-176-1135 | 3.00 ppm |
| 2017-01-30 | 1610-143-1325 | 2.70 ppm |
| 2017-01-30 | 1610-144-1315 | 1.10 ppm |
| 2017-01-31 | 1610-090-1225 | 3.10 ppm |
| 2017-01-31 | 1610-093-1125 | 3.80 ppm |
| 2017-01-31 | 1610-094-1215 | 3.70 ppm |
| 2017-01-31 | 1610-169-0805 | 2.00 ppm |
| 2017-01-31 | 1610-178-1250 | 2.50 ppm |
| 2017-01-31 | 1610-179-1520 | 2.80 ppm |
| 2017-02-01 | 1610-016-1343 | 1.30 ppm |
| 2017-02-01 | 1610-173-1355 | 1.10 ppm |
| 2017-02-01 | 1610-177-1405 | ND |
| 2017-02-02 | 1610-138-0900 | 1.20 ppm |
| 2017-02-02 | 1610-175-0938 | 2.80 ppm |
| 2017-02-07 | 1610-068-0837 | 1.70 ppm |
| 2017-02-08 | 1610-133-1150 | 3.80 ppm |
| 2017-02-09 | 1610-118-1105 | 3.50 ppm |
| 2017-02-13 | 1610-005-1440 | 3.80 ppm |
| 2017-02-16 | 1610-030-1130 | 3.10 ppm |
| 2017-02-27 | 1610-172-1335 | 3.60 ppm |
| 2017-03-21 | 1610-101-0915 | 0.590 ppm |
| 2017-03-22 | 1610-102-0800 | ND |
| 2017-03-23 | 1610-171-0630 | 2.70 ppm |
| 2017-03-28 | 1610-110-1130 | 2.70 ppm |
| 2017-03-28 | 1610-141-0830 | 2.20 ppm |
| 2017-03-29 | 1610-033-0830 | 3.20 ppm |
| 2017-04-26 | 1610-126-1015 | 4.90 ppm |
| 2017-04-26 | 1610-185-0800 | 0.620 ppm |
| 2017-05-08 | 1610-027-0925 | 5.30 ppm |
| 2017-05-09 | 1610-156-0955 | 7.10 ppm |
| 2017-05-10 | 1610-003-0840 | 1.50 ppm |
| 2017-05-10 | 1610-029-0920 | 5.90 ppm |
| 2017-05-24 | 1610-140-1020 | 1.50 ppm |
| 2017-06-07 | 1610-024-0845 | 3.70 ppm |
| 2017-06-27 | 1610-004-1005 | 0.810 ppm |
| 2017-06-29 | 1610-136-1000 | 3.70 ppm |
| 2017-07-05 | 1610-107-0920 | 2.80 ppm |
| 2017-07-05 | 1610-126-0845 | 5.00 ppm |
| 2017-07-19 | 1610-027-0905 | 5.80 ppm |
| 2017-07-20 | 1610-131-0910 | 4.30 ppm |
| 2017-07-27 | 1610-111-0910 | 5.00 ppm |
| 2017-07-27 | 1610-185-0800 | 0.680 ppm |
| 2017-07-31 | 1610-029-0945 | 5.50 ppm |
| 2017-08-03 | 1610-117-0915 | 3.50 ppm |
| 2017-08-09 | 1610-156-0940 | 6.50 ppm |
| 2017-09-28 | 1610-088-1032 | 2.80 ppm |
| 2017-09-28 | 1610-183-1125 | 2.60 ppm |
| 2017-11-02 | 1610-029-0919 | 6.20 ppm |
| 2017-11-02 | 1610-185-0849 | 0.640 ppm |
| 2017-11-15 | 1610-156-1010 | 6.40 ppm |
| 2017-11-30 | 1610-111-1220 | 5.80 ppm |
| 2017-12-07 | 1610-027-1115 | 6.00 ppm |
| 2017-12-07 | 1610-126-0855 | 5.00 ppm |
| 2017-12-11 | 1610-135-0945 | 1.70 ppm |
| 2017-12-14 | 1610-074-1350 | ND |
| 2017-12-19 | 1610-168-0950 | 1.10 ppm |
| 2017-12-27 | 1610-112-1305 | 4.70 ppm |
| 2017-12-27 | 1610-131-0855 | 4.50 ppm |
| 2018-01-09 | 1610-002-0850 | 1.10 ppm |
| 2018-01-09 | 1610-003-0910 | 1.50 ppm |
| 2018-01-09 | 1610-022-0915 | 5.20 ppm |
| 2018-01-09 | 1610-023-0900 | 4.10 ppm |
| 2018-01-09 | 1610-025-0839 | 2.70 ppm |
| 2018-01-09 | 1610-030-1110 | 3.40 ppm |
| 2018-01-09 | 1610-031-1040 | 3.50 ppm |
| 2018-01-09 | 1610-184-1003 | 4.50 ppm |
| 2018-01-10 | 1610-027-1225 | 6.30 ppm |
| 2018-01-10 | 1610-029-0905 | 6.00 ppm |
| 2018-01-10 | 1610-168-0935 | 1.10 ppm |
| 2018-01-11 | 1610-033-0900 | 3.50 ppm |
| 2018-01-11 | 1610-067-0915 | 1.40 ppm |
| 2018-01-11 | 1610-068-0900 | 1.60 ppm |
| 2018-01-11 | 1610-086-1000 | 3.00 ppm |
| 2018-01-11 | 1610-156-0940 | 6.50 ppm |
| 2018-01-11 | 1610-178-1030 | 2.90 ppm |
| 2018-01-11 | 1610-179-1100 | 3.00 ppm |
| 2018-01-17 | 1610-074-1305 | 0.560 ppm |
| 2018-01-18 | 1610-034-1025 | 3.40 ppm |
| 2018-01-18 | 1610-070-1100 | 4.10 ppm |
| 2018-01-18 | 1610-126-1249 | 5.00 ppm |
| 2018-01-18 | 1610-129-1309 | 4.50 ppm |
| 2018-01-18 | 1610-131-1317 | 4.60 ppm |
| 2018-01-18 | 1610-133-1140 | 3.80 ppm |
| 2018-01-18 | 1610-134-1200 | 3.90 ppm |
| 2018-01-18 | 1610-137-1154 | 2.40 ppm |
| 2018-01-18 | 1610-169-1205 | 2.20 ppm |
| 2018-01-18 | 1610-186-1215 | 2.80 ppm |
| 2018-01-18 | 1610-187-1230 | 1.70 ppm |
| 2018-01-22 | 1610-085-1057 | ND |
| 2018-01-24 | 1610-101-1450 | 0.680 ppm |
| 2018-01-24 | 1610-102-1350 | 0.610 ppm |
| 2018-01-24 | 1610-180-1335 | 2.80 ppm |
| 2018-01-24 | 1610-185-1400 | 0.720 ppm |
| 2018-01-25 | 1610-107-1036 | 2.90 ppm |
| 2018-01-25 | 1610-108-1100 | 3.00 ppm |
| 2018-01-25 | 1610-109-1120 | 3.10 ppm |
| 2018-01-25 | 1610-110-1145 | 3.00 ppm |
| 2018-01-25 | 1610-125-1130 | 4.00 ppm |
| 2018-01-25 | 1610-128-1200 | 4.50 ppm |
| 2018-01-25 | 1610-130-1055 | 4.40 ppm |
| 2018-01-25 | 1610-135-1230 | 1.90 ppm |
| 2018-01-25 | 1610-175-1345 | 2.90 ppm |
| 2018-01-30 | 1610-138-1035 | 1.50 ppm |
| 2018-01-30 | 1610-142-0940 | 2.80 ppm |
| 2018-01-30 | 1610-143-0955 | 1.60 ppm |
| 2018-01-30 | 1610-170-1025 | 3.70 ppm |
| 2018-01-30 | 1610-171-1040 | 3.50 ppm |
| 2018-01-31 | 1610-088-1220 | 3.10 ppm |
| 2018-01-31 | 1610-090-1115 | 4.60 ppm |
| 2018-01-31 | 1610-093-1250 | 5.10 ppm |
| 2018-01-31 | 1610-094-1135 | 4.50 ppm |
| 2018-01-31 | 1610-176-1010 | 3.50 ppm |
| 2018-01-31 | 1610-181-1210 | 4.80 ppm |
| 2018-02-01 | 1610-004-0850 | 0.830 ppm |
| 2018-02-01 | 1610-111-1010 | 5.00 ppm |
| 2018-02-01 | 1610-172-0940 | 4.40 ppm |
| 2018-02-01 | 1610-183-1220 | 2.20 ppm |
| 2018-02-06 | 1610-140-1310 | 1.30 ppm |
| 2018-02-06 | 1610-141-1246 | 1.80 ppm |
| 2018-02-06 | 1610-144-1225 | 1.20 ppm |
| 2018-02-07 | 1610-112-0924 | 5.10 ppm |
| 2018-02-07 | 1610-118-1010 | 3.70 ppm |
| 2018-02-07 | 1610-136-1000 | 3.70 ppm |
| 2018-02-13 | 1610-117-1440 | 3.40 ppm |
| 2018-02-15 | 1610-173-1045 | 1.60 ppm |
| 2018-02-15 | 1610-177-1205 | 1.50 ppm |
| 2018-03-06 | 1610-024-1345 | 3.50 ppm |
| 2018-03-06 | 1610-024-1350 | 3.50 ppm |
| 2018-04-11 | 1610-131-0900 | 4.20 ppm |
| 2018-04-19 | 1610-126-0850 | 5.00 ppm |
| 2018-04-26 | 1610-111-1140 | 5.30 ppm |
| 2018-04-26 | 1610-112-1140 | 4.70 ppm |
| 2018-04-26 | 1610-113-1310 | 4.80 ppm |
| 2018-04-26 | 1610-156-1035 | 6.00 ppm |
| 2018-04-30 | 1610-022-1300 | 4.90 ppm |
| 2018-04-30 | 1610-027-1250 | 5.60 ppm |
| 2018-04-30 | 1610-029-1235 | 5.70 ppm |
| 2018-06-19 | 1610-185-0750 | 0.710 ppm |
| 2018-07-18 | 1610-022-0900 | 4.50 ppm |
| 2018-07-18 | 1610-029-0855 | 5.10 ppm |
| 2018-07-18 | 1610-111-0818 | 4.80 ppm |
| 2018-07-18 | 1610-112-0849 | 4.80 ppm |
| 2018-07-25 | 1610-131-0930 | 4.50 ppm |
| 2018-07-26 | 1610-027-0845 | 5.60 ppm |
| 2018-07-31 | 1610-156-0950 | 6.10 ppm |
| 2018-08-16 | 1610-114-1107 | 3.60 ppm |
| 2018-08-16 | 1610-114-1110 | 3.60 ppm |
| 2018-08-16 | 1610-116-0935 | 3.30 ppm |
| 2018-08-16 | 1610-116-0941 | 3.30 ppm |
| 2018-08-21 | 1610-185-0740 | 0.670 ppm |
| 2018-09-17 | 1610-126-0840 | 4.90 ppm |
| 2018-10-03 | 1610-185-0826 | 0.660 ppm |
| 2018-10-24 | 1610-156-0915 | 6.30 ppm |
| 2018-10-25 | 1610-111-1035 | 5.00 ppm |
| 2018-10-31 | 1610-112-1100 | 4.90 ppm |
| 2018-11-08 | 1610-022-0910 | 4.90 ppm |
| 2018-11-08 | 1610-029-0848 | 5.30 ppm |
| 2018-11-13 | 1610-126-0928 | 4.80 ppm |
| 2018-11-19 | 1610-131-0845 | 4.50 ppm |
| 2018-11-26 | 1610-027-0840 | 5.90 ppm |
| 2019-01-14 | 1610-074-1340 | ND |
| 2019-01-16 | 1610-199-0915 | 0.840 ppm |
| 2019-01-23 | 1610-002-0858 | 0.870 ppm |
| 2019-01-23 | 1610-003-0930 | 1.60 ppm |
| 2019-01-23 | 1610-022-0910 | 4.60 ppm |
| 2019-01-23 | 1610-023-0845 | 3.70 ppm |
| 2019-01-23 | 1610-027-0855 | 5.30 ppm |
| 2019-01-23 | 1610-029-0930 | 5.40 ppm |
| 2019-01-24 | 1610-025-1200 | 2.80 ppm |
| 2019-01-24 | 1610-168-1325 | 1.000 ppm |
| 2019-01-30 | 1610-004-0900 | 0.930 ppm |
| 2019-01-30 | 1610-070-0950 | 3.10 ppm |
| 2019-01-30 | 1610-102-1205 | 0.600 ppm |
| 2019-01-30 | 1610-156-0915 | 6.20 ppm |
| 2019-01-30 | 1610-169-1005 | 2.00 ppm |
| 2019-01-30 | 1610-180-1040 | 2.80 ppm |
| 2019-01-30 | 1610-185-1152 | 0.740 ppm |
| 2019-01-31 | 1610-085-0846 | ND |
| 2019-02-05 | 1610-107-0905 | 2.70 ppm |
| 2019-02-05 | 1610-108-0923 | 2.70 ppm |
| 2019-02-05 | 1610-109-0945 | 2.80 ppm |
| 2019-02-05 | 1610-110-1007 | 2.70 ppm |
| 2019-02-05 | 1610-175-1042 | 2.70 ppm |
| 2019-02-05 | 1610-178-1200 | 2.50 ppm |
| 2019-02-05 | 1610-179-1220 | 2.50 ppm |
| 2019-02-06 | 1610-086-1220 | 2.70 ppm |
| 2019-02-06 | 1610-111-0850 | 5.50 ppm |
| 2019-02-06 | 1610-113-0953 | 5.00 ppm |
| 2019-02-06 | 1610-114-1040 | 3.90 ppm |
| 2019-02-06 | 1610-116-0925 | 5.20 ppm |
| 2019-02-07 | 1610-112-0951 | 4.60 ppm |
| 2019-02-07 | 1610-117-1040 | 3.70 ppm |
| 2019-02-07 | 1610-172-0846 | 3.70 ppm |
| 2019-02-14 | 1610-126-1010 | 4.60 ppm |
| 2019-02-14 | 1610-128-1000 | 3.60 ppm |
| 2019-02-14 | 1610-138-0912 | 1.50 ppm |
| 2019-02-14 | 1610-186-0932 | 2.10 ppm |
| 2019-02-21 | 1610-088-0935 | 4.00 ppm |
| 2019-02-21 | 1610-131-1000 | 4.10 ppm |
| 2019-02-21 | 1610-170-1100 | 3.00 ppm |
| 2019-02-21 | 1610-171-1025 | 3.10 ppm |
| 2019-02-21 | 1610-176-1130 | 3.20 ppm |
| 2019-02-26 | 1610-133-0942 | 3.70 ppm |
| 2019-02-28 | 1610-129-0945 | 3.90 ppm |
| 2019-02-28 | 1610-130-0937 | 3.90 ppm |
| 2019-02-28 | 1610-140-1110 | 1.50 ppm |
| 2019-02-28 | 1610-141-0930 | 1.50 ppm |
| 2019-02-28 | 1610-142-1020 | 2.90 ppm |
| 2019-02-28 | 1610-143-0945 | 1.80 ppm |
| 2019-03-04 | 1610-016-1320 | 1.70 ppm |
| 2019-03-05 | 1610-101-0745 | 0.710 ppm |
| 2019-03-05 | 1610-125-1010 | 3.20 ppm |
| 2019-03-05 | 1610-134-1030 | 3.50 ppm |
| 2019-03-06 | 1610-135-1130 | 1.70 ppm |
| 2019-03-06 | 1610-144-1420 | 1.50 ppm |
| 2019-03-07 | 1610-137-1000 | 1.80 ppm |
| 2019-03-07 | 1610-173-1045 | 1.10 ppm |
| 2019-03-07 | 1610-177-1210 | 1.30 ppm |
| 2019-03-14 | 1610-090-0850 | 4.40 ppm |
| 2019-03-14 | 1610-094-0951 | 4.20 ppm |
| 2019-03-14 | 1610-177-1135 | 1.30 ppm |
| 2019-03-14 | 1610-181-1020 | 4.30 ppm |
| 2019-03-14 | 1610-187-1335 | 2.00 ppm |
| 2019-03-14 | 1610-187-1338 | 1.90 ppm |
| 2019-03-20 | 1610-024-1207 | 4.00 ppm |
| 2019-03-21 | 1610-031-1121 | 3.40 ppm |
| 2019-03-21 | 1610-067-1315 | 1.60 ppm |
| 2019-03-21 | 1610-068-1345 | 1.60 ppm |
| 2019-03-21 | 1610-184-1017 | 4.90 ppm |
| 2019-03-21 | 1610-184-1020 | 4.90 ppm |
| 2019-03-25 | 1610-030-0944 | 3.10 ppm |
| 2019-03-25 | 1610-033-1030 | 3.30 ppm |
| 2019-03-25 | 1610-034-1100 | 3.20 ppm |
| 2019-03-26 | 1610-136-1329 | 2.60 ppm |
| 2019-03-26 | 1610-136-1330 | 2.60 ppm |
| 2019-03-26 | 1610-183-1043 | 2.20 ppm |
| 2019-03-27 | 1610-093-1430 | 4.30 ppm |
| 2019-03-27 | 1610-093-1432 | 4.30 ppm |
| 2019-04-15 | 1610-022-0830 | 5.40 ppm |
| 2019-04-18 | 1610-111-0952 | 4.80 ppm |
| 2019-04-18 | 1610-156-0925 | 6.30 ppm |
| 2019-05-01 | 1610-116-0925 | 4.40 ppm |
| 2019-06-06 | 1610-176-1035 | 3.20 ppm |
| 2019-06-10 | 1610-027-0935 | 5.90 ppm |
| 2019-06-11 | 1610-029-0830 | 6.10 ppm |
| 2019-06-11 | 1610-126-0930 | 4.50 ppm |
| 2019-06-13 | 1610-131-1045 | 3.80 ppm |
| 2019-06-18 | 1610-112-0930 | 4.30 ppm |
| 2019-06-27 | 1610-093-1015 | 4.60 ppm |
| 2019-07-22 | 1610-116-0930 | 2.90 ppm |
| 2019-07-24 | 1610-111-0620 | 4.60 ppm |
| 2019-07-24 | 1610-131-0649 | 3.60 ppm |
| 2019-08-06 | 1610-112-0843 | 4.30 ppm |
| 2019-08-28 | 1610-176-0930 | 3.10 ppm |
| 2019-09-11 | 1610-022-0920 | 4.90 ppm |
| 2019-09-11 | 1610-027-0835 | 5.30 ppm |
| 2019-09-12 | 1610-093-1157 | 4.60 ppm |
| 2019-09-17 | 1610-029-0915 | 6.20 ppm |
| 2019-09-18 | 1610-126-0900 | 4.70 ppm |
| 2019-10-01 | 1610-022-0820 | 5.20 ppm |
| 2019-10-01 | 1610-027-0905 | 5.60 ppm |
| 2019-10-02 | 1610-029-0915 | 5.90 ppm |
| 2019-10-02 | 1610-111-1035 | 6.00 ppm |
| 2019-10-02 | 1610-176-1109 | 3.10 ppm |
| 2019-10-03 | 1610-112-1035 | 4.60 ppm |
| 2019-11-05 | 1610-116-0930 | 3.30 ppm |
| 2019-11-06 | 1610-093-1307 | 4.80 ppm |
| 2019-11-06 | 1610-126-0910 | 5.00 ppm |