Diquat
Joliet
Diquat is a herbicide used on potato crops and aquatic weeds.
45
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 | N/A | 0 | 0 | N/A |
| 2015 | ND | 20 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 22 | 0 | ND |
| 2019 | ND | 1 | 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 |
|---|---|---|
| 2015-02-23 | SB50469-01_01 | ND |
| 2015-02-23 | SB50467-01_01 | ND |
| 2015-02-23 | SB50468-01_01 | ND |
| 2015-02-24 | SB50509-01_01 | ND |
| 2015-02-24 | SB50510-01_01 | ND |
| 2015-02-24 | SB50511-01_01 | ND |
| 2015-02-25 | SB50548-01_01 | ND |
| 2015-07-22 | SG51277-01_01 | ND |
| 2015-07-22 | SG51278-01_01 | ND |
| 2015-07-27 | SG51486-01_01 | ND |
| 2015-07-27 | SG51483-01_01 | ND |
| 2015-07-27 | SG51488-01_01 | ND |
| 2015-07-27 | SG51484-01_01 | ND |
| 2015-08-17 | SH51028-01_01 | ND |
| 2015-09-08 | SI50402-01_01 | ND |
| 2015-09-09 | SI50454-01_01 | ND |
| 2015-09-15 | SI50695-01_01 | ND |
| 2015-11-09 | SK50357-01_01 | ND |
| 2015-11-09 | SK50359-01_01 | ND |
| 2015-11-09 | SK50358-01_01 | ND |
| 2016-09-28 | 16I1124-01_01 | ND |
| 2016-10-18 | 16J0728-01_01 | ND |
| 2018-01-24 | 18A0503-01_01 | ND |
| 2018-01-25 | 18A0536-01_01 | ND |
| 2018-01-25 | 18A0535-01_01 | ND |
| 2018-01-29 | 18A0568-01_01 | ND |
| 2018-01-29 | 18A0566-01_01 | ND |
| 2018-01-29 | 18A0566-01 | ND |
| 2018-03-20 | 18C0470-01_01 | ND |
| 2018-03-27 | 18C0574-01_01 | ND |
| 2018-05-30 | 18E1199-01 | ND |
| 2018-05-30 | 18E1200-01 | ND |
| 2018-05-30 | 18E1201-01 | ND |
| 2018-05-30 | 18E1202-01 | ND |
| 2018-05-30 | 18E1203-01 | ND |
| 2018-05-30 | 18E1204-01 | ND |
| 2018-08-27 | 18H1308-01_01 | ND |
| 2018-08-27 | 18H1309-01 | ND |
| 2018-09-12 | 18I0460-01_01 | ND |
| 2018-09-12 | 18I0456-01_01 | ND |
| 2018-09-12 | 18I0455-01_01 | ND |
| 2018-10-23 | 18J0809-01_01 | ND |
| 2018-10-23 | 18J0810-01_01 | ND |
| 2018-10-24 | 18J0868-01_01 | ND |
| 2019-06-17 | 19F0547-01 | ND |