Diquat
City of Avondale
Diquat is a herbicide used on potato crops and aquatic weeds.
42
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 | 18 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 12 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 12 | 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 |
|---|---|---|
| 2014-01-27 | 4012115-01 | ND |
| 2014-01-27 | 4012114-01S | ND |
| 2014-01-28 | 4012237-01S | ND |
| 2014-01-28 | 4012236-01 | ND |
| 2014-01-29 | 4012322-01S | ND |
| 2014-02-13 | 4021148-01S | ND |
| 2014-05-20 | 4051717-01S | ND |
| 2014-05-20 | 4051714-01S | ND |
| 2014-05-20 | 4051718-01S | ND |
| 2014-05-20 | 4051822-01S | ND |
| 2014-05-20 | 4051823-01S | ND |
| 2014-05-22 | 4052004-01S | ND |
| 2014-08-06 | 4080590-01S | ND |
| 2014-08-06 | 4080578-01S | ND |
| 2014-08-07 | 4080712-01S | ND |
| 2014-08-07 | 4080710-01S | ND |
| 2014-08-07 | 408071-01S | ND |
| 2014-08-07 | 4080708-01S | ND |
| 2016-05-04 | 6050460-04S | ND |
| 2016-05-04 | 6050460-06S | ND |
| 2016-05-04 | 6050460-05S | ND |
| 2016-05-04 | 6050460-03S | ND |
| 2016-05-04 | 6050460-02S | ND |
| 2016-05-04 | 6050460-01S | ND |
| 2016-11-15 | 6111375-06 | ND |
| 2016-11-15 | 6111375-05 | ND |
| 2016-11-15 | 6111375-04 | ND |
| 2016-11-15 | 6111375-03 | ND |
| 2016-11-15 | 6111375-02 | ND |
| 2016-11-15 | 6111375-01 | ND |
| 2019-06-26 | 19F2791-06 | ND |
| 2019-06-26 | 19F2791-01 | ND |
| 2019-06-26 | 19F2791-02 | ND |
| 2019-06-26 | 19F2791-03 | ND |
| 2019-06-26 | 19F2791-04 | ND |
| 2019-06-26 | 19F2791-05 | ND |
| 2019-12-09 | 19L1129-03 | ND |
| 2019-12-09 | 19L1129-02 | ND |
| 2019-12-09 | 19L1129-01 | ND |
| 2019-12-12 | 19L1628-01 | ND |
| 2019-12-12 | 19L1628-03 | ND |
| 2019-12-12 | 19L1628-02 | ND |