Diquat
USMC - 29 Palms
Diquat is a herbicide used on potato crops and aquatic weeds.
18
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 | 7 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 11 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2015-01-26 | 3334-013-1140 | ND |
| 2015-01-26 | 3334-004-1330 | ND |
| 2015-01-26 | 3334-011-1450 | ND |
| 2015-01-26 | 3334-005-1200 | ND |
| 2015-01-26 | 3334-010-1245 | ND |
| 2015-01-26 | 3334-001-1100 | ND |
| 2015-03-02 | 3334-003-1100 | ND |
| 2018-02-27 | 3334-007-1320 | ND |
| 2018-02-27 | 3334-013-1120 | ND |
| 2018-02-27 | 3334-006-1255 | ND |
| 2018-02-27 | 3334-005-1200 | ND |
| 2018-02-27 | 3334-004-1230 | ND |
| 2018-02-27 | 3334-003-1100 | ND |
| 2018-02-27 | 3334-001-1140 | ND |
| 2018-02-28 | 3334-008-1145 | ND |
| 2018-02-28 | 3334-009-1200 | ND |
| 2018-02-28 | 3334-010-1100 | ND |
| 2018-02-28 | 3334-011-1130 | ND |