Diquat
Paw Penn District
Diquat is a herbicide used on potato crops and aquatic weeds.
38
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 | 17 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 15 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 3 | 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 |
|---|---|---|
| 2014-01-08 | 24409701 | ND |
| 2014-04-01 | 25337701 | ND |
| 2014-04-01 | 25337901 | ND |
| 2014-04-02 | 25337201 | ND |
| 2014-04-02 | 25338601 | ND |
| 2014-04-02 | 25337501 | ND |
| 2014-04-04 | 25337101 | ND |
| 2014-04-04 | 25338101 | ND |
| 2014-04-04 | 25338401 | ND |
| 2014-07-07 | 26113001 | ND |
| 2014-07-07 | 26113501 | ND |
| 2014-07-07 | 26114201 | ND |
| 2014-07-09 | 26114001 | ND |
| 2014-07-09 | 26113701 | ND |
| 2014-07-09 | 26113301 | ND |
| 2014-07-09 | 26113101 | ND |
| 2014-09-04 | 26113901 | ND |
| 2015-01-05 | 12315783 | ND |
| 2016-01-06 | 13783178 | ND |
| 2017-01-04 | 15551681 | ND |
| 2017-04-03 | 15975759 | ND |
| 2017-04-03 | 15975941 | ND |
| 2017-04-03 | 15975910 | ND |
| 2017-04-03 | 15975879 | ND |
| 2017-04-03 | 15975848 | ND |
| 2017-04-03 | 15975819 | ND |
| 2017-04-03 | 15975788 | ND |
| 2017-07-06 | 16450265 | ND |
| 2017-07-06 | 16450296 | ND |
| 2017-07-06 | 16450236 | ND |
| 2017-07-06 | 16450358 | ND |
| 2017-07-11 | 16450327 | ND |
| 2017-07-11 | 16450207 | ND |
| 2017-07-11 | 16450178 | ND |
| 2018-01-11 | 38160801 | ND |
| 2019-01-09 | 42498901 | ND |
| 2019-07-15 | 45716201 | ND |
| 2019-10-31 | 43999701 | ND |