Diquat
City of El Mirage
Diquat is a herbicide used on potato crops and aquatic weeds.
40
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 | 1 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 18 | 0 | ND |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 20 | 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 |
|---|---|---|
| 2014-02-11 | 4020905-02S | ND |
| 2015-10-06 | 5100896-01 | ND |
| 2016-03-07 | 6030608-01S | ND |
| 2016-04-07 | 6040689-03S | ND |
| 2016-04-07 | 6040689-02 | ND |
| 2016-04-07 | 6040689-01 | ND |
| 2016-05-16 | 6051378-01S | ND |
| 2016-05-20 | 6051810-02S | ND |
| 2016-05-20 | 6051810-01S | ND |
| 2016-05-23 | 6051915-02S | ND |
| 2016-05-23 | 6051915-01 | ND |
| 2016-09-27 | 6092333-01S | ND |
| 2016-12-14 | 6121326-01 | ND |
| 2016-12-14 | 6121321-01 | ND |
| 2016-12-15 | 6121430-01 | ND |
| 2016-12-22 | 6121947-01S | ND |
| 2016-12-27 | 6122102-01S | ND |
| 2016-12-27 | 6122097-01S | ND |
| 2016-12-28 | 6122222-01SOC | ND |
| 2016-12-30 | 6122383-01S | ND |
| 2019-01-31 | 19A3296-01 | ND |
| 2019-04-18 | 19D2239-01 | ND |
| 2019-04-30 | 19D3255-01 | ND |
| 2019-04-30 | 19D3251-01 | ND |
| 2019-05-01 | 19E0140-01 | ND |
| 2019-05-01 | 19E0136-01 | ND |
| 2019-05-01 | 19E0134-01 | ND |
| 2019-06-10 | 19F1007-01 | ND |
| 2019-06-20 | 19F2265-01 | ND |
| 2019-06-24 | 19F2482-01 | ND |
| 2019-07-02 | 19G0397-01 | ND |
| 2019-10-07 | 19J0835-01 | ND |
| 2019-10-08 | 19J1148-02 | ND |
| 2019-10-08 | 19J1148-01 | ND |
| 2019-10-08 | 19J1147-01 | ND |
| 2019-10-09 | 19J1316-02 | ND |
| 2019-10-09 | 19J1316-01 | ND |
| 2019-12-10 | 19L1246-01 | ND |
| 2019-12-12 | 19L1634-01 | ND |
| 2019-12-12 | 19L1636-01 | ND |