Diquat
Monterey Rural Water System Inc.
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 |
|---|---|---|---|---|
| 2014 | N/A | 0 | 0 | N/A |
| 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 | 6 | 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 |
|---|---|---|
| 2016-03-16 | 35235028005 | ND |
| 2016-03-16 | 35235028004 | ND |
| 2016-03-16 | 35235028003 | ND |
| 2016-03-16 | 35235028004 | ND |
| 2016-03-16 | 35235028005 | ND |
| 2016-03-16 | 35235028003 | ND |
| 2016-12-08 | 35282709001 | ND |
| 2016-12-08 | 35282709002 | ND |
| 2016-12-08 | 35282709003 | ND |
| 2016-12-08 | 35282709003 | ND |
| 2016-12-08 | 35282709002 | ND |
| 2016-12-08 | 35282709001 | ND |
| 2019-12-11 | 35518398001 | ND |
| 2019-12-11 | 35518398002 | ND |
| 2019-12-11 | 35518398001 | ND |
| 2019-12-11 | 35518398002 | ND |
| 2019-12-19 | 35520417001 | ND |
| 2019-12-19 | 35520417001 | ND |