Diquat
San Jose Water Company
Diquat is a herbicide used on potato crops and aquatic weeds.
54
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 | ND | 15 | 0 | ND |
| 2015 | ND | 4 | 0 | ND |
| 2016 | ND | 6 | 0 | ND |
| 2017 | ND | 18 | 0 | ND |
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 7 | 0 | ND |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 6 ppb
The EWG Health Guideline of 6 ppb for diquat was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cataracts.
EPA Maximum Contaminant
Level (MCL) 20 ppb
The legal limit for diquat, established in 1992, was based on a toxicity study in laboratory animals conducted in the 1980s.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-01-13 | 1610-182-0900 | ND |
| 2014-01-13 | 1610-181-0910 | ND |
| 2014-03-05 | 1610-180-0915 | ND |
| 2014-03-06 | 1610-183-0934 | ND |
| 2014-04-09 | 1610-185-0830 | ND |
| 2014-05-07 | 1610-075-1014 | ND |
| 2014-05-09 | 1610-025-0845 | ND |
| 2014-06-09 | 5867-131-1010 | ND |
| 2014-06-09 | 5867-126-0945 | ND |
| 2014-06-16 | 1610-186-0845 | ND |
| 2014-08-05 | 5867-184-0930 | ND |
| 2014-08-14 | 5867-178-0930 | ND |
| 2014-09-11 | 5867-111-0936 | ND |
| 2014-09-25 | 5867-187-0900 | ND |
| 2014-10-02 | 5867-184-0855 | ND |
| 2015-01-14 | 5867-186-1355 | ND |
| 2015-02-23 | 5867-185-0840 | ND |
| 2015-03-05 | 1610-156-0922 | ND |
| 2015-04-09 | 1610-186-1015 | ND |
| 2016-03-30 | 1610-075-1407 | ND |
| 2016-05-04 | 9590-198-1200 | ND |
| 2016-05-20 | 1610-075-0900 | ND |
| 2016-06-15 | 9590-199-1300 | ND |
| 2016-07-26 | 9590-197-1230 | ND |
| 2016-10-21 | 1610-168-0910 | ND |
| 2017-01-10 | 1610-126-0904 | ND |
| 2017-01-17 | 1610-027-0950 | ND |
| 2017-01-19 | 1610-029-1210 | ND |
| 2017-03-27 | 1610-168-0900 | ND |
| 2017-04-26 | 5867-126-1015 | ND |
| 2017-05-08 | 1610-027-0925 | ND |
| 2017-05-09 | 1610-156-0955 | ND |
| 2017-05-10 | 1610-029-0920 | ND |
| 2017-06-15 | 1610-168-0940 | ND |
| 2017-07-20 | 5867-131-0910 | ND |
| 2017-07-21 | 5867-111-1035 | ND |
| 2017-07-31 | 5867-168-0855 | ND |
| 2017-08-09 | 5867-156-0940 | ND |
| 2017-08-17 | 5867-180-0840 | ND |
| 2017-11-07 | 5867-180-0845 | ND |
| 2017-11-07 | 5867-168-0910 | ND |
| 2017-12-07 | 5867-111-1250 | ND |
| 2017-12-14 | 5867-075-1335 | ND |
| 2018-01-17 | 5867-075-1150 | ND |
| 2018-01-17 | 5867-202-1135 | ND |
| 2018-04-30 | 1610-202-0945 | ND |
| 2018-04-30 | 1610-075-0950 | ND |
| 2019-01-16 | 1610-199-0915 | ND |
| 2019-01-29 | 1610-202-0841 | ND |
| 2019-01-29 | 1610-075-0815 | ND |
| 2019-04-11 | 1610-202-1105 | ND |
| 2019-04-11 | 1610-075-1105 | ND |
| 2019-05-06 | 1610-199-1015 | ND |
| 2019-07-23 | 1610-199-0945 | ND |