Diquat
Regional Water Authority
Diquat is a herbicide used on potato crops and aquatic weeds.
54
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 |
|---|---|---|---|---|
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 22 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 32 | 0 | ND |
| 2023 | N/A | 0 | 0 | N/A |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
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 |
|---|---|---|
| 2019-05-08 | SOC 200531300 | ND |
| 2019-05-28 | SOC 200533720 | ND |
| 2019-05-28 | SOC 200533719 | ND |
| 2019-05-28 | SOC 200533803 | ND |
| 2019-05-28 | SOC 200533804 | ND |
| 2019-05-28 | SOC 200533660 | ND |
| 2019-05-28 | SOC 200533659 | ND |
| 2019-05-29 | SOC 200533881 | ND |
| 2019-05-29 | SOC 200533880 | ND |
| 2019-05-29 | SOC 200533867 | ND |
| 2019-05-29 | SOC 200533868 | ND |
| 2019-08-26 | SOC 200546197 | ND |
| 2019-08-26 | SOC 200546198 | ND |
| 2019-08-26 | SOC 200546200 | ND |
| 2019-08-27 | SOC 200546267 | ND |
| 2019-08-27 | SOC 200546303 | ND |
| 2019-08-27 | SOC 200546302 | ND |
| 2019-08-27 | SOC 200546268 | ND |
| 2019-08-28 | SOC 200546738 | ND |
| 2019-08-28 | SOC 200546737 | ND |
| 2019-08-28 | SOC 200546736 | ND |
| 2019-08-28 | SOC 200546553 | ND |
| 2022-07-11 | S300210822 300210826 | ND |
| 2022-07-11 | S300210156 300210160 | ND |
| 2022-07-11 | S300210164 300210168 | ND |
| 2022-07-11 | S300210651 300210655 | ND |
| 2022-07-11 | S300210659 300210663 | ND |
| 2022-07-12 | S300211086 300211090 | ND |
| 2022-07-12 | S300211076 300211080 | ND |
| 2022-07-12 | S300211068 300211072 | ND |
| 2022-07-13 | S300212413 300212417 | ND |
| 2022-07-13 | S300212421 300212425 | ND |
| 2022-07-14 | S300212957 300212961 | ND |
| 2022-10-17 | S300258850 300258854 | ND |
| 2022-10-17 | 300258850 300258854B | ND |
| 2022-10-17 | 300258858 300258862B | ND |
| 2022-10-17 | S300258858 300258862 | ND |
| 2022-10-18 | S300259358 300259362 | ND |
| 2022-10-18 | S300258921 300258925 | ND |
| 2022-10-18 | 300258921 300258925B | ND |
| 2022-10-18 | 300259358 300259362B | ND |
| 2022-10-18 | S300259350 300259354 | ND |
| 2022-10-18 | 300259350 300259354B | ND |
| 2022-10-18 | 300258913 300258917B | ND |
| 2022-10-18 | S300258913 300258917 | ND |
| 2022-10-19 | S300259930 300259936 | ND |
| 2022-10-19 | 300259930 300259936B | ND |
| 2022-10-19 | 300259940 300259944B | ND |
| 2022-10-19 | S300259940 300259944 | ND |
| 2022-10-19 | S300260499 300260503 | ND |
| 2022-10-19 | 300260499 300260503B | ND |
| 2022-10-19 | 300260507 300260511B | ND |
| 2022-10-19 | S300260507 300260511 | ND |
| 2022-12-06 | S300281400 300281404 | ND |