Diquat
Rancho California Water District
Diquat is a herbicide used on potato crops and aquatic weeds.
49
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 |
|---|---|---|---|---|
| 2014 | ND | 5 | 0 | ND |
| 2015 | ND | 5 | 0 | ND |
| 2016 | ND | 8 | 0 | ND |
| 2017 | ND | 9 | 0 | ND |
| 2018 | ND | 13 | 0 | ND |
| 2019 | ND | 9 | 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 |
|---|---|---|
| 2014-05-08 | 3334-143-1015 | ND |
| 2014-08-06 | 3334-143-0905 | ND |
| 2014-09-04 | 3334-059-0935 | ND |
| 2014-09-16 | 3334-059-0805 | ND |
| 2014-11-12 | 3334-143-1045 | ND |
| 2015-02-10 | 3334-143-0905 | ND |
| 2015-05-14 | 3334-143-1505 | ND |
| 2015-08-05 | 3334-143-1455 | ND |
| 2015-10-14 | 3334-142-1045 | ND |
| 2015-11-04 | 3334-143-0955 | ND |
| 2016-01-20 | 3334-142-1030 | ND |
| 2016-03-02 | 3334-071-1035 | ND |
| 2016-04-14 | 3334-142-1100 | ND |
| 2016-06-09 | 3334-018-1020 | ND |
| 2016-07-27 | 3334-142-1130 | ND |
| 2016-10-11 | 3334-015-0935 | ND |
| 2016-10-11 | 3334-051-1030 | ND |
| 2016-11-09 | 3334-153-1110 | ND |
| 2017-02-03 | 3334-153-1050 | ND |
| 2017-03-23 | 3334-142-1020 | ND |
| 2017-03-29 | 3334-142-0910 | ND |
| 2017-04-12 | 3334-142-1030 | ND |
| 2017-05-04 | 3334-153-1010 | ND |
| 2017-07-13 | 3334-142-1025 | ND |
| 2017-08-10 | 3334-153-1225 | ND |
| 2017-09-28 | 3334-059-0943 | ND |
| 2017-11-22 | 3334-151-1110 | ND |
| 2018-02-07 | 3334-150-1251 | ND |
| 2018-02-07 | 3334-151-1127 | ND |
| 2018-04-13 | 3334-053-1150 | ND |
| 2018-05-03 | 3334-150-1140 | ND |
| 2018-05-03 | 3334-151-1250 | ND |
| 2018-07-17 | 3334-152-1045 | ND |
| 2018-08-14 | 3334-150-0928 | ND |
| 2018-08-22 | 3334-151-1007 | ND |
| 2018-10-03 | 3334-152-1030 | ND |
| 2018-10-17 | 3334-155-1240 | ND |
| 2018-11-27 | 3334-143-1030 | ND |
| 2018-11-27 | 3334-151-1249 | ND |
| 2018-11-27 | 3334-150-1136 | ND |
| 2019-01-09 | 3334-152-1100 | ND |
| 2019-01-09 | 3334-155-0930 | ND |
| 2019-02-19 | 3334-150-1032 | ND |
| 2019-02-19 | 3334-151-0911 | ND |
| 2019-03-12 | 3334-071-1030 | ND |
| 2019-04-02 | 3334-155-1115 | ND |
| 2019-06-04 | 3334-018-1030 | ND |
| 2019-07-25 | 3334-155-0945 | ND |
| 2019-10-08 | 3334-051-1045 | ND |