Diquat
New Orleans Carrollton Waterworks
Diquat is a herbicide used on potato crops and aquatic weeds.
41
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 | ND | 8 | 0 | ND |
| 2019 | ND | 10 | 0 | ND |
| 2020 | ND | 6 | 0 | ND |
| 2021 | ND | 6 | 0 | ND |
| 2022 | ND | 6 | 0 | ND |
| 2023 | ND | 5 | 0 | ND |
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 |
|---|---|---|
| 2018-03-15 | 35380391002 | ND |
| 2018-03-15 | 35380391001 | ND |
| 2018-03-15 | 35380391001 | ND |
| 2018-03-15 | 35380391002 | ND |
| 2018-08-15 | 35411633001 | ND |
| 2018-08-15 | 35411633002 | ND |
| 2018-08-15 | 35411633002 | ND |
| 2018-08-15 | 35411633001 | ND |
| 2019-04-11 | 35461214001 | ND |
| 2019-04-11 | 35461215001 | ND |
| 2019-04-11 | 35461215001 | ND |
| 2019-04-11 | 35461214001 | ND |
| 2019-08-01 | 35486661001 | ND |
| 2019-08-01 | 35486665001 | ND |
| 2019-08-01 | 35486661001 | ND |
| 2019-08-01 | 35486665001 | ND |
| 2019-09-19 | 35499418001 | ND |
| 2019-09-19 | 35499418001 | ND |
| 2020-03-26 | 35540032001 | ND |
| 2020-03-26 | 35540029001 | ND |
| 2020-03-26 | 35540024001 | ND |
| 2020-10-08 | 35583702001 | ND |
| 2020-10-08 | 35583691001 | ND |
| 2020-10-08 | 35583701001 | ND |
| 2021-03-29 | 35622307001 | ND |
| 2021-03-29 | 35622309001 | ND |
| 2021-03-29 | 35622313001 | ND |
| 2021-10-14 | 35671090001 | ND |
| 2021-10-14 | 35671094001 | ND |
| 2021-10-14 | 35671099001 | ND |
| 2022-03-15 | 35704709001 | ND |
| 2022-03-15 | 35704707001 | ND |
| 2022-03-15 | 35704706001 | ND |
| 2022-10-13 | 35753420001 | ND |
| 2022-10-13 | 35753422001 | ND |
| 2022-10-13 | 35753419001 | ND |
| 2023-03-06 | 35783931001 | ND |
| 2023-03-06 | 35783938001 | ND |
| 2023-03-06 | 35783939001 | ND |
| 2023-11-16 | 35842434001 | ND |
| 2023-11-16 | 35842436001 | ND |