Diquat
Lexington & Joseph Harp Correctional Institution
Diquat is a herbicide used on potato crops and aquatic weeds.
36
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 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | 0.281 ppb | 36 | 6 | ND - 3.30 ppb |
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 |
|---|---|---|
| 2019-02-26 | SDWA-1342977-01 | ND |
| 2019-02-26 | SDWA-1342972-00 | ND |
| 2019-02-26 | SDWA-1342972-01 | ND |
| 2019-02-26 | SDWA-1342973-00 | ND |
| 2019-02-26 | SDWA-1342973-01 | ND |
| 2019-02-26 | SDWA-1342974-00 | ND |
| 2019-02-26 | SDWA-1342974-01 | ND |
| 2019-02-26 | SDWA-1342975-00 | ND |
| 2019-02-26 | SDWA-1342975-01 | ND |
| 2019-02-26 | SDWA-1342976-00 | ND |
| 2019-02-26 | SDWA-1342976-01 | ND |
| 2019-02-26 | SDWA-1342977-00 | ND |
| 2019-05-06 | SDWA-1367731-00 | ND |
| 2019-05-06 | SDWA-1367733-01 | ND |
| 2019-05-06 | SDWA-1367733-00 | ND |
| 2019-05-06 | SDWA-1367732-01 | 3.30 ppb |
| 2019-05-06 | SDWA-1367732-00 | 3.30 ppb |
| 2019-05-06 | SDWA-1367731-01 | ND |
| 2019-05-06 | SDWA-1367730-01 | ND |
| 2019-05-06 | SDWA-1367730-00 | ND |
| 2019-05-06 | SDWA-1367729-01 | ND |
| 2019-05-06 | SDWA-1367729-00 | ND |
| 2019-05-06 | SDWA-1367728-01 | 0.500 ppb |
| 2019-05-06 | SDWA-1367728-00 | 0.500 ppb |
| 2019-08-13 | SDWA-1402243-00 | ND |
| 2019-08-13 | SDWA-1402240-00 | ND |
| 2019-08-13 | SDWA-1402241-00 | ND |
| 2019-08-13 | SDWA-1402242-00 | 0.400 ppb |
| 2019-08-13 | SDWA-1402244-00 | ND |
| 2019-08-13 | SDWA-1402245-00 | ND |
| 2019-12-09 | SDWA-1447685-00 | 2.10 ppb |
| 2019-12-09 | SDWA-1447690-00 | ND |
| 2019-12-09 | SDWA-1447689-00 | ND |
| 2019-12-09 | SDWA-1447688-00 | ND |
| 2019-12-09 | SDWA-1447687-00 | ND |
| 2019-12-09 | SDWA-1447686-00 | ND |