Diquat
Hope Water Light Comm.
Diquat is a herbicide used on potato crops and aquatic weeds.
34
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 | 12 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 12 | 0 | ND |
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 2 | 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 |
|---|---|---|
| 2014-03-11 | 14072010308 | ND |
| 2014-03-11 | 14072009908 | ND |
| 2014-03-11 | 14072010008 | ND |
| 2014-03-11 | 14072010108 | ND |
| 2014-03-11 | 14072010208 | ND |
| 2014-03-11 | 14072009808 | ND |
| 2014-05-21 | 14142009808 | ND |
| 2014-05-21 | 14142009708 | ND |
| 2014-05-21 | 14142009607 | ND |
| 2014-05-21 | 14142009507 | ND |
| 2014-05-21 | 14142009407 | ND |
| 2014-05-21 | 14142008807 | ND |
| 2015-03-02 | 15065000508 | ND |
| 2015-04-06 | 15100000108 | ND |
| 2016-01-26 | 16028001308 | ND |
| 2016-02-09 | 16042000708 | ND |
| 2016-04-04 | 16098011708 | ND |
| 2017-01-04 | 17005005108 | ND |
| 2017-01-04 | 17005004908 | ND |
| 2017-01-04 | 17005005208 | ND |
| 2017-01-04 | 17005005408 | ND |
| 2017-01-04 | 17005005308 | ND |
| 2017-01-04 | 17005005008 | ND |
| 2017-05-09 | 17130008607 | ND |
| 2017-05-09 | 17130008207 | ND |
| 2017-05-09 | 17130008307 | ND |
| 2017-05-09 | 17130008407 | ND |
| 2017-05-09 | 17130008507 | ND |
| 2017-05-09 | 17130008707 | ND |
| 2018-02-20 | 18053003208 | ND |
| 2018-04-04 | 18095008608 | ND |
| 2018-07-03 | 18186006308 | ND |
| 2019-02-19 | 4204956 | ND |
| 2019-05-20 | 4303241 | ND |