Diquat
California Water Service - Stockton
Diquat is a herbicide used on potato crops and aquatic weeds.
37
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 | 2 | 0 | ND |
| 2015 | ND | 6 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 7 | 0 | ND |
| 2018 | ND | 9 | 0 | ND |
| 2019 | ND | 11 | 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 |
|---|---|---|
| 2014-07-29 | 5810-130-1100 | ND |
| 2014-12-02 | 5810-130-1419 | ND |
| 2015-06-10 | 9590-130-1142 | ND |
| 2015-08-16 | 1610-133-1900 | ND |
| 2015-09-22 | 9590-130-1120 | ND |
| 2015-10-26 | 9590-060-1145 | ND |
| 2015-11-19 | 9590-059-1056 | ND |
| 2015-12-09 | 9590-018-0553 | ND |
| 2016-03-22 | 9590-061-1500 | ND |
| 2016-09-20 | 5810-130-0954 | ND |
| 2017-04-18 | 9590-133-1146 | ND |
| 2017-06-06 | 5810-130-1520 | ND |
| 2017-07-12 | 9590-133-1420 | ND |
| 2017-07-13 | 9590-029-1354 | ND |
| 2017-09-19 | 9590-130-1042 | ND |
| 2017-10-10 | 9590-058-0950 | ND |
| 2017-10-10 | 9590-133-1110 | ND |
| 2018-01-02 | 9590-054-1115 | ND |
| 2018-01-03 | 9590-133-0950 | ND |
| 2018-04-05 | 9590-133-1320 | ND |
| 2018-04-11 | 9590-050-1225 | ND |
| 2018-06-05 | 9590-130-1405 | ND |
| 2018-07-09 | 9590-056-1305 | ND |
| 2018-07-09 | 9590-133-1100 | ND |
| 2018-09-05 | 9590-130-1448 | ND |
| 2018-10-09 | 9590-133-1325 | ND |
| 2019-01-02 | 9590-133-1301 | ND |
| 2019-02-14 | 9590-061-1430 | ND |
| 2019-04-02 | 9590-133-1235 | ND |
| 2019-04-23 | 9590-053-1145 | ND |
| 2019-05-08 | 9590-007-1120 | ND |
| 2019-06-11 | 9590-130-1140 | ND |
| 2019-07-09 | 9590-133-1400 | ND |
| 2019-09-04 | 9590-130-1250 | ND |
| 2019-10-01 | 9590-067-1150 | ND |
| 2019-10-02 | 9590-028-1300 | ND |
| 2019-10-09 | 9590-133-1059 | ND |